2014 model year · 5,100+ owner reports · Updated September 2026
2014 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
Interest applies to the selected vehicle and configuration; it is not a reservation. Voting stores a first-party identifier for up to 180 days to prevent repeat votes. No account or email is needed. Clearing cookies or using another device may count separately. Privacy
Visual coming soon
Your interest helps us choose what to build next.
Visual Known Issues · Coming soon
$4.99/month plus taxes at launch · No payment today
According to Au7o's analysis of 5,100+ owner reports, the 2014 Mercedes-Benz E-Class has 12 documented known issues, with 7 rated critical. The most serious are Air Suspension Failure (W212) ($800-$3,000 repair), OM642 Diesel Oil Cooler Leak ($800-$2,500 repair), Camshaft Adjuster Solenoid / Position Sensor Oil Wicking into the Engine Harness and ECU ($250-$4,000 repair), Electronic Steering Lock (ESL/ELV) Motor Failure Causing Steering Locked and No-Crank ($300-$1,500 repair), NOx Sensor Failure in the SCR/AdBlue System Triggering a Start-Prevention Countdown ($600-$1,800 repair), M276 V6 Camshaft Adjuster (VVT Phaser) Wear Causing Cold-Start Rattle and Cam/Crank Correlation Faults ($1,500-$4,000 repair) and OM642 Diesel Intake Swirl-Flap Actuator Motor (M55) Failure and Carbon-Clogged Intake Runners Causing Limp Mode ($600-$2,500 repair). The most commonly reported issue is Air Suspension Failure (W212) with 2,100 owner reports. Across all issues with published estimates, repair costs range from $100 to $4,000. DIY maintenance guides at au7o.io.
Don't see your problem? Describe your symptoms to get a diagnosis, or get a full repair guide.
According to Au7o's analysis of 5,100+ owner reports, the 2014 Mercedes-Benz E-Class has 12 documented issues. The most frequently reported are: Air Suspension Failure (W212), OM642 Diesel Oil Cooler Leak, Camshaft Adjuster Solenoid / Position Sensor Oil Wicking into the Engine Harness and ECU. Of these, 7 are rated critical and should be addressed promptly.
The 2014 Mercedes-Benz E-Class has 12 known issues documented across 5,100+ owner reports. 7 issues are rated critical: Air Suspension Failure (W212) and OM642 Diesel Oil Cooler Leak and Camshaft Adjuster Solenoid / Position Sensor Oil Wicking into the Engine Harness and ECU and Electronic Steering Lock (ESL/ELV) Motor Failure Causing Steering Locked and No-Crank and NOx Sensor Failure in the SCR/AdBlue System Triggering a Start-Prevention Countdown and M276 V6 Camshaft Adjuster (VVT Phaser) Wear Causing Cold-Start Rattle and Cam/Crank Correlation Faults and OM642 Diesel Intake Swirl-Flap Actuator Motor (M55) Failure and Carbon-Clogged Intake Runners Causing Limp Mode. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known Mercedes-Benz E-Class issues range from $100 to $4,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Air Suspension Failure (W212), typically costs $800-$3,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
The AIRMATIC air suspension on the W212 E-Class develops leaks in the air springs (struts), causing the vehicle to sag overnight or drop on one corner. The compressor wears out from overwork trying to compensate for leaking struts. Repairs typically run $800-$3,000. Severity: high.
The OM642 3.0L V6 diesel engine oil cooler seals fail, causing engine oil to leak into the coolant or vice versa. The oil cooler is sandwiched between the engine block and the intake manifold, making access difficult. Repairs typically run $800-$2,500. Severity: high.
On the M272 and M276 V6 engines the camshaft position sensors and camshaft adjuster (VVT) solenoids sit in the timing cover, which is notorious for seeping oil. Oil gets past the sensor O-ring and into the electrical connector, then wicks up the wire strands inside the harness in… Repairs typically run $250-$4,000. Severity: high.
The W212 (and its W207 coupe sibling) uses an electronic steering column lock that must physically retract a locking pin and report 'unlocked' to the EIS before the car will crank. The tiny DC motor and the plastic gear that drive the pin wear out. Owners report a progressive pat… Repairs typically run $300-$1,500. Severity: high.
BlueTEC diesels use a selective catalytic reduction system that injects AdBlue urea into the exhaust, with NOx sensors upstream and downstream of the SCR catalyst reporting how effectively NOx is being converted. The downstream sensor in particular lives in a harsh, hot, urea-cry… Repairs typically run $600-$1,800. Severity: high.
On the M276 3.5L V6 (and the related M278 V8) the four camshaft adjusters — the variable-valve-timing phasers bolted to the ends of the cams — wear internally. The locking pin and vane chambers lose their ability to hold position, and oil bleeds out of the adjuster while the car… Repairs typically run $1,500-$4,000. Severity: high.
On the OM642 V6 diesel used in the E320 CDI/BlueTEC and E350 BlueTEC, the swirl-flap actuator motor sits low on the intake and is directly under the turbo intake seal, which is itself a known oil-leak point. Oil drips onto the motor and kills it, and the plastic linkage arm betwe… Repairs typically run $600-$2,500. Severity: high.
The crankshaft position sensor fails due to heat exposure and oil contamination, causing intermittent stalling, no-start conditions, and rough running. The sensor is mounted near the flywheel and exposed to high temperatures. Repairs typically run $100-$350. Severity: medium.
Both the W211 and W212 route sunroof and panoramic-roof water through four drain tubes down the A- and C-pillars. The front tubes exit inside the front wheel liner through small Phillips-shaped openings that clog with leaves, pollen and roof-sealant debris. When they block, water… Repairs typically run $150-$1,200. Severity: medium.
The W212 panoramic roof is not sealed — the glass tray is designed to collect water and route it through four drain tubes down the A- and C-pillars to exits behind the front wheel arches and near the rear bumper. Pollen, tree debris and dirt build up in the tray corners and block… Repairs typically run $150-$900. Severity: medium.
The M276 3.5L V6 in the W212 E350 uses a three-chain drive with hydraulic tensioners on each chain. When the car sits overnight, oil drains back out of the tensioner bores, so on the next cold start the tensioners take a second or two to pump up and the chains slap against the gu… Repairs typically run $700-$2,200. Severity: medium.
Mercedes LI82.85-P-055695 directly includes model series 212 and describes a COMAND unit that does not start, remains dark or cannot be operated because of software. It directs a temporary circuit-30 interruption followed by a software update and says not to replace the COMAND un… Severity: low.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
