2014 Mercedes-Benz CLS550

From 2000 through 2017, Takata produced millions of air bag inflators using two types of phase-stabilized ammonium nitrate ("PSAN") propellant -- propellant 2004 and propellant 2004L. After prolonged exposure to high temperature cycles and humidity, inflators using propellant 2004 can degrade, causing the propellant to burn too quickly when ignited. The rapid burning can cause the inflator to rupture during deployment, potentially causing serious or even fatal injury to vehicle occupants. See 2016 Blomquist Report at www.nhtsa.gov/sites/nhtsa.gov/files/documents/expert_report-hrblomquist.pdf.Consequently, all frontal inflators using propellant 2004 that do not contain a "desiccant" (a substance that traps and holds moisture) in US vehicles are under recall. These "non-desiccated" inflators either have been or are required to be replaced.In some cases, the remedy part for these recalled inflators was, or will be, an inflator using either propellant 2004 or 2004L that does contain a desiccant. None of these "desiccated" remedy parts (which were installed in older model year vehicles) are currently under recall for a degradation concern. Certain subsets of desiccated PSAN inflators using propellant 2004 for use as original equipment, however, have been recalled for a degradation concern. All Takata inflators produced with propellant 2004L contain desiccant, and none of these desiccated inflators using propellant 2004L are under recall for a degradation concern. There have been no reported field ruptures in any non-recalled desiccated PSAN inflators.It is understood that desiccants fully saturate at some threshold, at which point any additional moisture will not be captured. This means the degradation process observed in non-desiccated inflators using propellant 2004 may also occur in non-recalled desiccated inflators using propellant 2004, assuming additional moisture enters the inflator and high temperature cycling occurs. Based on available information, desiccant saturation can occur within the first five years in the worst environments, and the time required for full saturation is affected by multiple factors. While no present safety risk has been identified, further work is needed to evaluate the future risk of non-recalled desiccated inflators using propellant 2004.Three entities -- Takata (now known as TK Global), the Independent Testing Coalition, and Exponent -- have been studying the long-term behavior of Takata desiccated PSAN inflators using propellant 2004L (as well as 2004) in the presence of moisture and temperature cycling. The research efforts, which include development of predictive modeling techniques and field sample analysis, are ongoing. To date, none of the researchers have identified field evidence showing that propellant 2004L is undergoing a degradation process that leads to aggressive deployment and potential rupture. However, the time in service of such inflators remains short compared to that of the inflators using propellant 2004. Further study is needed to assess the long-term safety of desiccated inflators using propellant 2004L.The Office of Defects Investigation is opening this investigation to examine whether a safety defect related to propellant degradation exists in non-recalled desiccated PSAN frontal inflators manufactured by Takata. This investigation will require extensive information on Takata production processes and surveys of inflators in the field. Lists of recall actions that may have used desiccated PSAN inflators as remedy parts, as well as the makes and models originally manufactured with them, is available with the downloadable version of this document (see nhtsa.gov/recalls?nhtsaId=EA21002 -- note this information is subject to change/revision as the investigation proceeds). This investigation does not supersede EA15-001, which remains open.

After the Mercedes dealer replaced the corroded rear sub frame under the 20 year extended warranty, my brake line failed so I took it back & found out that the brake lines were corroded. I paid nothing for the subframe since it was under the warranty but I ended up paying $4114 to replace the corroded brake lines. The dealer should have checked for corrosion while the subframe was out of the car, especially since this is a known issue. The parts were only $380 and $3800+ was labor. My brakes completely failed while driving on Christmas Eve. I took the car to the dealership on 12/26/25 and they told me that the car was unsafe to drive & I had to leave it. This should be covered by Mercedes under the rest subframe warranty since from what I’ve read, is a related issue. This was extremely dangerous. I was scheduled to travel back to NY, almost 300 miles from VA, where I got the car fixed. The dealership did not do their due diligence when the rear subframe was replaced so they had to drop the subframe to fix the brake lines, resulting in the huge labor charge. I got the upgraded nickel lines to avoid corrosion in the future but this is definitely a safety hazard that could have put me and my family in complete danger, had I not gone out on Christmas Eve to grab something from the store. I am looking for reimbursement from the dealership and/or MB for the extra hours of labor that they charged me. This brake issue is very concerning and was extremely scary. My brake went all the way to the floor, all the lights came on and this happened without any type of prior warning. Something needs to be done to make sure that the brake line repair is also done at the same time that the rear subframe is done. Also, after the brake line was repaired, I had an issue with the brakes. I did not have this issue prior to the brake line replacement & now they are asking me to pay $1300 for front brakes & rotors. I had no issues with my brakes at all, nor did any sensors go off.

NHTSA ID

11711966

Incident

Dec 24, 2025

I just had 2 tires replaced and on the way home I hit a pothole both front air shocks failed. I filed a claim and the insurance company won’t pay out either. Normal wear and tear does not make both air shocks failed.

NHTSA ID

11704776

Incident

Mar 15, 2025

have a 2014 cls-550 with extensive subframe rust. It is currently sitting at the dealership for $3,158 in repairs for a vehicle that is less than 10 years old. There needs to be a recall on the subframe for the c, cls, e, and like models. This is not the Mercedes’-Benz quality I expected. After extensive research, members all over the globe are experiencing the same issue. This isn’t user error. It’s manufacturer error. You need to make this right with your customers. Period. I have attached photos of my subframe. I’m severely disappointed with having to perform major maintenance on a vehicle with only 82k miles. This needs to be a recall. I cannot stress this enough. Stand by your product. You’re more than welcome to contact me. My vehicle will be in the shop for over a week and no loaner vehicle is available for use. The car is currently at Mercedes Benz of South Mississippi. I have owned multiple Mercedes’ products from c class, clk class, and two cls550s. This is what I sent to Mercedes Benz corporate. This was the response: Thank you so much for contacting Mercedes-Benz USA regarding your concerns of the condition of your 2014 CLS550's rear subframe. We understand the circumstances you've faced as a result of your vehicle's required repairs, and we are delighted to guide you in the best direction as a valued member of our Mercedes-Benz family. Our goal is always to advocate for our customer's concerns. While we would love to cover all repairs outside of warranty terms, it's simply unrealistic. It is our recommendation that you submit your photos to the National Highway Traffic Safety Association, as they are an entity that can investigate any considerations for recalls based on customer's claims. Your concerns will be documented to your account with Mercedes-Benz as well. We hope you find the following information useful, and we wish you all the best.

NHTSA ID

11496131

Incident

Sep 9, 2022

Front passenger assembly strut went out suddenly while driving almost caused an accident.No warning signs just gave out. Vehicle is in the shop but cannot be repaired because the part is out of stock and no ETA on when vendor will restock them.

NHTSA ID

11468097

Incident

May 21, 2022

WHILE VEHICLE WAS STATIONARY IN GARAGE, WE BEGAN NOTICING A PROFUSE GAS/FUEL SMELL. IT BECAME INCREASINGLY STRONG IN AND OUT OF THE VEHICLE. APPROXIMATELY 3 DAYS AFTER SMELL WAS NOTICED, I CONTACTED THE LOCAL MERCEDES BENZ DEALERSHIP TO ADVISE OF THE ISSUE. I ALSO DID SOME RESEARCH ONLINE, AND DISCOVERED THAT PREVIOUS YEARS SPECIFICALLY; 2006-2011 CLS CLASS VEHICLES EXHIBITED THE SAME DEFECT WHICH WAS ADDRESSED WITH THE NHTSA AND TO WHICH MB-USA AGREED TO EXTEND THE WARRANTY FOR "COVERED FUEL TANK COMPONENTS" FROM THE ORIGINAL 4 YEARS TO 15 YEARS. THE DEALERSHIP DIAGNOSED THE LEFT SIDE SENDER UNIT TO BE CRACKED AND LEAKING FUEL, WHICH IS ONE OF THE COVERED COMPONENTS. HOWEVER, THEY ADVISED THAT MY CAR WAS NOT COVERED DUE TO THE AGE OF THE VEHICLE (I.E. IT BEING NEWER). AS SUCH, I HAD TO PAY FOR THE REPAIRS TO THE VEHICLE AS WELL AS VEHICLE RENTAL NEEDED DURING THE TIME OF REPAIRS. THE STRONG ODOR AND FUMES OF FUEL STEMMING FROM A COMPONENT DEFECT POSES A SEVERE SAFETY AND HEALTH HAZARD, WHILE VEHICLE IS STATIONARY OR IN MOTION. THERE IS A POTENTIAL FOR IGNITION FROM STRAY SOURCES, DIZZINESS, HEADACHES, ETC. THIS IS A QUALITY DEFECT THAT SHOULD BE THE RESPONSIBILITY OF THE CAR MANUFACTURER TO CORRECT. PLEASE ADVISE AS A RECALL IS WARRANTED.

NHTSA ID

11338036

Incident

Jun 26, 2020

Mileage

82,000 mi

ON MARCH 8 2020 I WAS DRIVING MY 2014 MERCEDES BENZ CLS550 STRAIGHT ON THE FREEWAY WHEN MY SUNROOF EXPLODED, GLASS SHATTERING EVERYWHERE. GLASS HIT MY FACE AND WENT DOWN MY BACK AND CUT MY HANDS. I DIDN'T CRASH THE CAR NOR WAS ANY OTHER DAMAGE DONE THAN THE SUNROOF. I PULLED OVER WHEN IT WAS SAFE TO INSPECT THE VEHICLE AND NO OBJECT HAD CAME THROUGH THE SUNROOF. THE FRONT OF THE SUNROOF WAS INDENTED INWARD AND GLASS WAS ANGLED OUTWARD AS IF IT HAD EXPLODED FROM THE INSIDE OUT. I RESEARCHED ONLINE TO FIND THAT THERE WAS A RECALL FOR 760,000 MERCEDES BENZ YEARS 2001-2011 FOR DEFECTIVE SUNROOF. MY CAR BEING A 2014, FALLS OUT OF THAT DEMOGRAPHIC. THERE IS A CURRENT CLASS ACTION LAWSUIT FOR THE NEWER MAKES AND MODELS OF MERCEDES FOR THE EXACT SAME ISSUE, "EXPLODING SUNROOF." I TOOK MY CAR INTO THE SHOP ON MARCH 9, 2020 TO MERCEDES BENZ OF MARIN. MERCEDES BENZ OF MARIN WAS NOT WILLING TO HELP OR ASSUME RESPONSIBILITY FOR THE REPAIRS SO I HAVE REACHED OUT TO MERCEDES BENZ USA WHO IS DOING AN INVESTIGATION OF THE ISSUE. I AM WAITING TO HEAR BACK, HOWEVER I AM NOT OPTIMISTIC AS MERCEDES HAS NOT BEEN HELPFUL THUS FAR AND MY CAR HAS BEEN IN THE SHOP FOR OVER ONE MONTH. THE FACT THAT THIS IS A RECORDED ISSUE AND MERCEDES IS NOT DOING THEIR DUE DILIGENCE TO FIX IT IS CRIMINAL, AS I HAVE A FAMILY AND LUCKILY NO ONE ELSE WAS IN THE VEHICLE, NOR DID I CRASH INTO SOMEONE ELSE OR SOMETHING AND GET SEVERELY INJURED OR DIE. *TR

NHTSA ID

11321079

Incident

Mar 8, 2020

Mileage

90,000 mi

TL* THE CONTACT OWNS A 2014 MERCEDES BENZ CLS550. THE CONTACT STATED THAT WHILE DRIVING AT LOW SPEEDS AND OR REVERSING WITH THE BRAKE PEDAL DEPRESSED, THE VEHICLE INDEPENDENTLY SHIFTED INTO PARK WITHOUT WARNING. THE VEHICLE WAS TAKEN TO MERCEDES-BENZ OF WILMINGTON LOCATED AT (3801 LANCASTER PIKE, WILMINGTON, DE 19805 (302) 995-2211) TO BE DIAGNOSED. THE CONTACT WAS INFORMED THAT THE GPS/TRACKING DEVICE NEEDED TO BE REMOVED. THE VEHICLE WAS REPAIRED BUT THE FAILURE RECURRED. THE VEHICLE WAS TAKEN BACK TO THE SAME DEALER WHERE DIAGNOSED AND THE CONTACT WAS INFORMED THAT THE ELECTRONIC IGNITION SWITCH NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS CONTACTED AND INFORMED OF THE FAILURE. THE FAILURE MILEAGE WAS 76,434.

NHTSA ID

11317698

Incident

Sep 1, 2019

Mileage

76,434 mi

TL* THE CONTACT OWNED A 2014 MERCEDES-BENZ CLS550. WHILE DRIVING LESS THAN 20 MPH, THE CONTACT'S VEHICLE WAS STRUCK ON THE FRONT DRIVER'S SIDE FENDER BY ANOTHER VEHICLE. THE AIR BAG DID NOT DEPLOY. THE CONTACT SUSTAINED BRAIN, NECK, AND LOWER BACK INJURIES THAT REQUIRED MEDICAL ATTENTION. A POLICE REPORT WAS FILED. THE VEHICLE WAS TOWED TO THE INSURANCE LOT AND DEEMED DESTROYED. THE VEHICLE WAS NOT DIAGNOSED. THE DEALER AND MANUFACTURER WERE NOT CONTACTED. THE APPROXIMATE FAILURE MILEAGE WAS 62,000.

NHTSA ID

11187069

Incident

Feb 17, 2019

Mileage

62,000 mi

Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). The noise is heard once in each instance when changing direction of travel. Note: Sound file in attachment Cause If the complaint is eliminated by experimentally loosening the outboard collar nut (by 1 turn), the problem is due to cracking of the microweld between the wheel bearing inner race and the joint housing of the side shaft. Note: The collar nut must always be replaced after being loosened. See also LI33.20-P-078406 Remedy Coat contact surface of side shaft with wheel bearing with Molykote paint. To do this, proceed as follows: 1. Remove side shafts 2. Clean contact surface A (see image file in attachment "Outer joint housing before") before coating with Molykote, using "spirit" (free of dust and grease) 3. Coat contact surface A (see image file in attachment "Outer joint housing after") with Molykote and leave to dry for "one hour" in removed condition 4. Reinstall side shafts Note: Before using the antifriction coating (Molykote), stir it or shake it thoroughly for (at least 1 minute).

Complaint After successful commissioning of the HERMES control unit (N112/9) with XENTRY Diagnosis DVD 03/2026, the message "SOS - service not activated" appears on the instrument cluster. In addition, the following two conditions are also met: • HERMES (N112/9) control unit: event code B15CE00 is ACTIVE and STORED (A+S) • Vehicle Documentation System: For the HERMES control unit, the EID1, EID2, ICCID, IMEI, IMSI, TELNR fields in the "Identification/Serial number" column have the value "-" Cause Still under analysis Remedy Recommission the HERMES control unit (N112/9) with XENTRY Diagnosis 03/2026 and add-on 33399 installed or carry out the procedure with a newer version of XENTRY Diagnosis: XENTRY→ "N112/9 - Control unit for telematics services (HERMES)" -> "Adaptations" -> "Control unit commissioning" -> "Commissioning of previously installed control unit"

Complaint The customer requests deactivation of the N112/9 HERMES communication module Note: Deactivation of the HERMES control unit (N112/9) is not supported for gray-market vehicles. Cause Before deactivating the HERMES control unit (N112/9), it must be clarified by the legal department of the respective MPC whether and under what conditions deactivation may be carried out. If deactivation is not permissible under applicable law, the HERMES control unit (N112/9) must not be deactivated. Remedy Please inform the customer that, following deactivation, the vehicle will no longer be able to place an automatic emergency call, nor will the customer be able to place a manual emergency call. After deactivation, the Mercedes-Benz Digital Extras will also no longer be available. Please have the attached sample form checked by your market's legal department, adapted to local requirements if necessary, and approved. Furthermore, after informing the customer about the effects of deactivation, please have the workshop complete and sign the approved form together with the customer, and send it to the MPC via a TIPS case for audit-compliant documentation. Furthermore, the workshop must affix a sticker to the emergency call button cover on the overhead control panel and to the emergency call button itself. After affixing, pictures of the overhead control panel need to be attached to the TIPS case for audit-proof documentation. After deactivation, the HERMES control unit (N112/9) is in the "Out of Service" operating status, and the display "SOS NOT READY" appears in the Audio/COMAND system. This display message tells the customer that the emergency call function is not available. In detail, the following steps must be carried out 1. The workshop must inform the customer about the effects of deactivation (see above) 2. Legal review by the MPC Legal department to determine whether deactivation is permissible for the vehicle and provision of a market-specific customer form based on the examples (see "Example - Deactivation communication module HERMES customer declaration English V3.0.pdf") 3. Completion of the market-specific customer form by the workshop and obtaining the customer’s signature 4. Creation of a XSS ticket by the workshop for the MPC with the signed customer form attached 5. Written confirmation of legally reviewed and approved deactivation by the MPC in the TIPS case (see attachment How+to+request+adding+Code+09o+via+XSS+v2.pdf, point 1) 6. Creation of an XSS ticket for documentation of the SA code "09o" (zero nine oh) in the Vehicle Documentation System (see attachment How+to+request+adding+Code+09o+via+XSS+v2.pdf, steps 2–7) 7. Ordering of stickers (part number A9078172900), quantity: 2 8. Affixing of the sticker (part number A9078172900) to the cover of the emergency call button on the overhead control panel (see attachment HERMES-Deactivation_+pictures+of+sticker.png) 9. Affixing of the sticker (part number A9078172900) to the emergency call button on the overhead control panel (see attachment HERMES-Deactivation_+pictures+of+sticker.png) 10. Taking photos of the applied stickers and attaching them to the TIPS case 11. After the XSS ticket has been successfully processed, the communication module must be deactivated using XENTRY: • Connect XENTRY Diagnosis • Access the HERMES control unit (N112/9) • "Adaptation" tab, menu item "Teach-in processes" -> "Deactivation" • Follow the instructions

Complaint There are several types of complaint about noises or poor windshield wiper wiping performance: A: Wiper blades squeaking, chattering, shuddering B: The windshield is not wiped completely (streaking) C: During the downward movement water is pulled back onto the windshield from the A-pillar (Figure 1) D: After windshield cleaning, water keeps spraying onto the windshield for several wipe cycles (Figure 2) A1: The windshield and wiper blades are contaminated with residues from car washing facilities, identifiable by the water beading. The resulting differences in the friction values between the wiper blades and the windshield can excite the wiper blades to vibrate. Note: It is mostly wax residue from the washer system, but also water-repellent nano-particle coating for paint and/or silicone-based washer fluid, that could cause this problem. A partially dry windshield also has different friction values, which can likewise result in squeaking of the wiper blades A2: The wiper blades are worn by mechanical damage (wiper lip damaged by ice or insect debris, or deformed by long periods of disuse). A3: Incorrect angle of incidence of the wiper arms to the windshield. Because of this, the rubber lip of the wiper blade may not flip over at the reversal point. Cause B: B1: Wax/ dirt residues on the windshield B2: Wiper blades deformed or worn B3: Downforce of wiper arm not OK (Figure 3) Cause C: Water is pulled back onto the windshield by the differential pressure created as the wiper arm moves downwards. Cause D: Washer water collects in the fastening of the wiper blade and is blown onto the windshield by the airstream over several wipe cycles. Note and supporting information: Wiper blades are wear parts which, even when "not used" for long periods (kept in park position), may become permanently deformed and damaged. Further stresses on the rubber wiper blade arise due to various environmental influences which progressively change the effectiveness of the rubber wiper blade and accelerate the aging process. Due to the natural aging process and wear, the wiper blades should be replaced twice a year, preferably in Spring and Fall (see operator's manual). Remedy Remedy A: A1: Cleaning entire windshield with A 000 986 40 71. A2: Checking water's flow behavior after windshield has been cleaned (see Video 1). If, after cleaning, there are still areas with water beading, then the cleaning process must be carried out again until a rejection reaction is no longer present. • Note: On the vehicle in the video (Video 1), water still beads on the bottom left of the windshield. The windshield is still not properly clean, even though it appears to be clean. The windshield is only properly clean when there are no more areas on the windshield where water beads. A3: Replace wiper blades with genuine wiper blades. Important: Only exchange wiper blades if windshield no longer has water-repellent areas Note: Replacement of wiper blades is not covered under warranty and can be replaced at the expense of the customer. Remedy B: B1: Clean windshield with intensive cleaner A 000 986 40 71. Important: Do not clean the wiper blades otherwise the graphite coating will be damaged. B2: Replace wiper blades with genuine wiper blades • Note: Replacement of wiper blades is not covered under warranty and can be replaced at the expense of the customer. B3: Check the wiper arm for excessive resistance in the bearing. Restore mobility or replace wiper arm if necessary. Remedy C: Problem inherent in design for which there is no technical remedy. Exception: X204 up to 02/2014. In these vehicles, it is possible to install the design configuration of vehicles as of 02/2014. This includes wiper arms (styled arms) with improved behavior in this respect. It is also necessary to replace the wiper blades because the styled arms feature a Top Lock connection (previously Side Lock).

Complaint Headlamp, front fog lamp leaky or fogged. Cause Fogging of the headlamps is a natural phenomenon, which can occur under certain climatic conditions. It does not lead to any technical impairment of the headlamp. If a pressure compensation diaphragm is fitted in the housing cover, then the lamp unit is a "closed system". Remedy Headlamp: Remedy 1 Clearing fogged/condensed LED headlamps: 1. Drive vehicle into workshop (temperature higher than +18 °C/+64.4 °F) and connect the exhaust extraction. Note: Do not perform an engine wash before the defogging test. 2. Switch off the engine and connect battery support via a charger. 3. Open the hood. 4. Switch on the lights. 5. Leave the vehicle in this state for 60 minutes. 6. Check for formation of condensation, a significant reduction in the formation of condensation must be clearly recognizable (thawing progress). Clearing of fogged/condensed LED headlamps and LED rear lamps on electric vehicles: 1. Drive the vehicle into the workshop (temperature higher than +18 °C/+64.4°F). 2. Connect battery backup via a charger. 3. Open the front-end flap and ensure sufficient ventilation. 4. Switch on the lights. 5. Leave the vehicle in this state for 60 minutes. 6. Check for formation of condensation, a significant reduction in the formation of condensation must be clearly recognizable (thawing progress). Clearing fogged/condensed halogen/xenon headlamps: 1. Drive the vehicle into the workshop (temperature higher than +18 °C/+64.4°F). Note: Do not perform an engine wash before the defogging test. 2. Switch off the engine. 3. Open the hood. 4. Switch off the lights. 5. Leave the vehicle in this state for 60 minutes. 6. Check for formation of condensation, a significant reduction in the formation of condensation must be clearly recognizable (thawing progress). Note: If there is no visible reduction in condensation, check the headlamp for malfunctions. (see Remedy 2) It is not physically possible to defog the headlamps completely. Fogging does not impair the operation or the service life of the headlamp. Note: Only implement Remedy 1 for model series 463 (from model year 2018) and model series 465. Remedy 2 A defective headlamp can be identified as follows: 1. Check the headlamp for external damage and that the cover caps and the diaphragm are correctly seated. 2. Check the electrical connectors of the plugs and pins. 3. Check for leak tightness according to LI82.10-P-078307. The test can only be conducted on headlamps. 4. If the headlamp or the rear lamp has any external damage, replace the component part in accordance with the WIS instructions. Note: External damage to the headlamp/rear lamp or faulty seating of the cover caps does not present a warranty or goodwill case. Note: With headlamps, it is possible to install desiccant packs if the problem occurs repeatedly. • Open ventilation system LI82.10-P-078302 • Closed ventilation system LI82.10-P-078304

Complaint Headlamp, front fog lamp leaky or fogged Cause Fogging of the headlamps is a natural phenomenon, which can occur under certain climatic conditions. It does not lead to any technical impairment of the headlamp. If a pressure compensation diaphragm is fitted in the housing cover, then the lamp unit is a "closed system". Remedy Headlamp: Remedy 1 Clearing fogged/condensed LED headlamps: 1. Drive vehicle into workshop (temperature higher than +18 °C/+64.4 °F) and connect the exhaust extraction. Note: Do not perform an engine wash before the defogging test. 2. Switch off the engine and connect battery support via a charger. 3. Open the hood. 4. Switch on the lights. 5. Leave the vehicle in this state for 60 minutes. 6. Check for formation of condensation, a significant reduction in the formation of condensation must be clearly recognizable (thawing progress). Clearing of fogged/condensed LED headlamps and LED rear lamps on electric vehicles: 1. Drive the vehicle into the workshop (temperature higher than +18 °C/+64.4°F). 2. Connect battery backup via a charger. 3. Open the front-end flap and ensure sufficient ventilation. 4. Switch on the lights. 5. Leave the vehicle in this state for 60 minutes. 6. Check for formation of condensation, a significant reduction in the formation of condensation must be clearly recognizable (thawing progress). Clearing fogged/condensed halogen/xenon headlamps: 1. Drive the vehicle into the workshop (temperature higher than +18 °C/+64.4°F). Note: Do not perform an engine wash before the defogging test. 2. Switch off the engine. 3. Open the hood. 4. Switch off the lights. 5. Leave the vehicle in this state for 60 minutes. 6. Check for formation of condensation, a significant reduction in the formation of condensation must be clearly recognizable (thawing progress). Note: If there is no visible reduction in condensation, check the headlamp for malfunctions. (see Remedy 2) It is not physically possible to defog the headlamps completely. Fogging does not impair the operation or the service life of the headlamp. Note: Only implement Remedy 1 for model series 463 (from model year 2018) and model series 465. Remedy 2 A defective headlamp can be identified as follows: 1. Check the headlamp for external damage and that the cover caps and the diaphragm are correctly seated. 2. Check the electrical connectors of the plugs and pins. 3. Check for leak tightness according to LI82.10-P-078307. The test can only be conducted on headlamps. 4. If the headlamp or the rear lamp has any external damage, replace the component part in accordance with the WIS instructions. Note: External damage to the headlamp/rear lamp or faulty seating of the cover caps does not present a warranty or goodwill case. Note: With headlamps, it is possible to install desiccant packs if the problem occurs repeatedly. • Open ventilation system LI82.10-P-078302 • Closed ventilation system LI82.10-P-078304