Buyer Research

2014 Mercedes-Benz E-Class — Should You Buy One?

Typical asking price: $9,000–$15,000. There are 5 high-severity known issues you need to know before handing over a check.

Deciding between model years? Compare the 15 Mercedes-Benz E-Class years we've written up →

Kestrel Take

The heaviest record of any W212 year — 304 complaints, and fifteen of them report a fire. Two stories run through it. The first is corrosion: 55 brake complaints and 27 structure complaints that are the same rear subframe and the rear hard lines rotting together, with owners quoting $4,300 for lines alone and $8,800 for the pair. The second is stranger and specific to this year's electrical cluster — door speakers that crackle, then smoke, with ten fire reports behind them. Neither is a reason to write the car off. Both are reasons to insist on a lift, a full-tank sniff test and a proper listen to every speaker before you buy.

What we checked

Reconciled against public records, 2026-09-25

NHTSA holds 304 owner complaints for the 2014 Mercedes-Benz E-Class, and 8 recall campaigns.

A big number here usually means a lot of these were sold, not that it is a bad vehicle — popular models collect more complaints for the same rate of trouble. So the total on its own says little. What is worth reading is the shape of it. The largest single group is airbags at 19%. That is notable without being overwhelming — worth checking, not worth panicking about.

8 recall campaigns cover this model year. Recalls are repaired free, for any owner, with no time limit on most safety campaigns — but only if someone books it in. Ask the seller to show it was done, or have any dealer check the VIN; it takes them a couple of minutes and costs nothing.

Counts come from the NHTSA complaint and recall database — free, public, and worth checking yourself.

Known Issues for the 2014 Mercedes-Benz E-Class

Ranked by wallet impact. These are documented, recurring problems — not freak accidents. How we decide that.

Rear brake lines rot through and take the brakes with themHigh — wallet impact

Brake is the most repeated word in this year's record. Owners describe a spongy pedal, then a Low Brake Fluid warning, then total loss of braking as a corroded line lets go. One was quoted $8,800 for the subframe and lines together and Mercedes covered the parts; another says the lines failed while the rest of the car was clean. This is the single inspection that matters most on a 2014: get the car in the air and look at the hard lines running over the rear subframe.

Repair cost (estimate): $1,400–$4,300 for the rear hard lines — about 36% of what this car is typically worth

Source: NHTSA complaints filed under the brakes (55).

Door speaker wiring overheats and fills the cabin with smokeHigh — wallet impact

Ten of this year's 41 electrical complaints mention fire, and the descriptions match each other closely: a door speaker begins to squeal and sputter while driving, then smells acrid, then smokes, sometimes continuing to pop after the engine is off. One owner had it happen three separate times. Play the stereo through every door at a decent volume during the test drive and listen for crackle or buzz, and treat any burnt-plastic smell in the cabin as a walk-away until it is diagnosed.

Repair cost (estimate): $200–$900 per door for the speaker and the harness repair

Source: NHTSA complaints filed under electrics and electronics (41).

Takata inflator campaign on the passenger airbag moduleHigh — wallet impact

Fifty-eight airbag complaints, and the pattern is unchanged from the earlier years: a notice arrives naming the passenger airbag module, the dealer has no part, and the wait runs into years. The risk is an inflator that ruptures during deployment. The work is free, so what you are buying is either a car where it was done or a car where it was not. NHTSA's VIN lookup is the only source worth trusting on that point.

Repair cost: Not yet priced — a safety matter first, a repair bill second

Source: NHTSA complaints filed under airbags (58).

Rear subframe corrosion on cars with clean bodyworkHigh — wallet impact

Twenty-seven structure complaints, and owners repeat one point again and again: nothing else on the car is rusty. A nine-year-old example with 73,000 miles was told at dealer service that the subframe and lines needed replacing as a safety matter. Because the body gives you no warning, this can only be checked from underneath, and it is worth paying an independent Mercedes specialist for an hour on a lift before you commit to any salt-belt car.

Repair cost (estimate): $3,500–$8,800 when the brake lines are replaced with it — around 73% of what this car is typically worth

Source: NHTSA complaints filed under the body and structure (27).

Engine wiring harness contaminated by oil from the camshaft sensorsHigh — wallet impact

An owner in the engine cluster describes a fault light and multiple performance problems traced by the dealer to the engine harness being soaked with oil, which the dealer called a known issue. Oil travels up from a leaking camshaft sensor or solenoid into the connector and then along the wiring. Symptoms are misfires, warning lights and rough running. Ask any inspecting mechanic to unplug a camshaft sensor connector and look inside it; oil in the plug means the clock is running.

Repair cost (estimate): $1,200–$3,500 for the harness and sensors — about 29% of what this car is typically worth

Source: NHTSA complaints filed under the engine (24).

Walk-Away Red Flags

✗A brake pedal that feels soft or sinks under steady pressure
✗Crackling, popping or buzzing from any door speaker, or a hot-plastic smell
✗Rust flaking from the rear brake lines or the rear crossmember on a lift
✗A Low Brake Fluid or Brake System message in the display
✗A check engine light with a misfire you can feel at idle

Good Signs

✓New rear brake lines or a replaced subframe documented with a date and mileage
✓Every door speaker playing cleanly at volume with the engine running
✓Airbag inflator replacement shown complete on the NHTSA VIN lookup
✓A southern or western car with a dry, original-looking underside
✓Camshaft sensor connectors that come apart clean and dry