2005 Mercedes-Benz E-Class engine problems
moderate 13 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
The failure pattern owners describe
Owners of 2005 Mercedes E-Class models describe recurrent sudden power loss during highway driving and acceleration. The engine loses all throttle response without warning; downshifting and full throttle have no effect. Restart restores function, but the failure repeats unpredictably. Early complaints show no check engine light; later ones trigger EGR out-of-range codes. Dealers are unable to duplicate the problem in multiple visits, and replacing the EGR valve has not resolved it for owners who tried that repair.
Additional engine failures include cam and crankshaft position sensor faults that cause stalling without warning—one dealer noted this was a common problem. Some owners report engine stalls at idle, excessive RPM surges during low-speed turns, and no-start conditions requiring computer reprogramming.
Diesel-model owners report black smoke and soot discharge from the exhaust. Mercedes claims this operates within specifications; dealers blame fuel quality.
Fuel system problems plague multiple owners: gas leaks in multiple locations, constant fuel smell, oil leaks, and EVAP system failures that repeatedly fail smog testing. One owner had the fuel tank replaced but the check engine light returned. Motor mount leaks appear at low mileage. Secondary air injection and EVAP vent control circuit failures are documented on smog test records.
Same Mercedes-Benz E-Class engine reports on nearby years: 2006 · 2007 · 2008
Failure modes owners describe
Sudden power loss / stall under acceleration
Engine loses all power without warning during highway driving or acceleration, requiring restart to restore function. No check engine light initially; some later show EGR codes. Dealers unable to duplicate in several cases. Multiple owners report this occurs intermittently.
When: 13,745 miles to 167,000 miles; occurs during highway driving and acceleration
Symptoms owners cite: Dramatic loss of engine power; Full throttle has no effect; Downshifting has no effect; Engine stalls and must be restarted; Temporary loss of responsiveness
Codes mentioned: EGR out of range, P0400 (inferred from EGR mention)
Repairs/costs cited: One owner: EGR valve replaced without resolving issue. Suspected soot buildup in EGR valve and intake manifold (owner-identified, not confirmed by dealer). Dealer unable to fix in multiple attempts.
Recalls/TSBs owners mention: Dealer stated unable to duplicate problem; no specific recalls or TSBs mentioned for this failure mode.
Cam and crankshaft position sensor failure
Faulty sensors cause engine to stall without warning, sometimes in traffic. One owner reports this was a common problem at the dealer. Requires sensor replacement.
When: Not specified; reported as recurring issue
Symptoms owners cite: Engine stalls unexpectedly; No warning lights before failure; Engine dies in traffic
Repairs/costs cited: Cam position sensor 003-153-28-28 and sender unit 004-153-69-28 replaced. Dealer noted internal fault.
Recalls/TSBs owners mention: Dealer stated this was a common problem on these models.
Excessive RPMs and engine noise during normal driving
Engine emits noise and RPMs increase excessively during low-speed maneuvers. Engine returns to normal after restart. Occurs intermittently.
When: 35,000 miles; occurred twice within six months
Symptoms owners cite: Engine noise emission; Excessive RPM increase; Abnormal engine behavior at low speed
Repairs/costs cited: Not taken to dealer or mechanic for inspection.
Black smoke and soot discharge from exhaust
Engine emits black smoke intermittently and deposits black tar-like soot from exhaust. Occurs on diesel models. Mercedes claims operation within factory specifications; dealer blames fuel quality.
When: Not specified
Symptoms owners cite: Black smoke from exhaust (intermittent); Black soot/tar discharge from exhaust
Repairs/costs cited: No repairs made; manufacturer and dealer denied problem.
Recalls/TSBs owners mention: Mercedes stated operation within factory specifications. Dealer (Skyland Automotive, Asheville, NC) attributed to poor-quality diesel fuel.
Fuel system leaks and EVAP issues
Multiple fuel leaks in different areas and oil leaks throughout engine. Car smells constantly of gasoline. EVAP system fails smog test. Check engine light repeatedly returns after repairs.
When: Not specified
Symptoms owners cite: Gas smell; Fuel leaks in multiple areas; Oil leaks throughout engine; Check engine light
Codes mentioned: EVAP leak
Repairs/costs cited: Multiple repair attempts by mechanics; small leak found via smoke test; EVAP system repaired but check engine light returned. Owner reports dangerously ongoing leaks.
Recalls/TSBs owners mention: Owner reports Mercedes had extended warranty to avoid recalling several safety complaints; previous owner never pursued.
Check engine light - fuel tank replacement
Check engine warning light remains illuminated. Independent mechanic diagnosed fuel tank replacement as needed. Problem recurred after repair. Owner mentions related recall but VIN not verified.
When: 167,000 miles
Symptoms owners cite: Check engine warning light illuminated; Problem recurrence after fuel tank replacement
Repairs/costs cited: Fuel tank replaced at independent mechanic; failure recurred.
Recalls/TSBs owners mention: Owner mentioned manufacturer recall related to failure, but VIN not included in complaint.
Engine fails to start or no-start condition
Vehicle will not start when key turned, occurring multiple times without warning lights. Computer reprogramming by dealer did not resolve. One instance: engine shut down while idling; would not restart for 20 minutes.
When: 13,745 miles to 14,027 miles in one case; other instances timing not specified
Symptoms owners cite: Vehicle will not start; No response to key turn; No warning lights; Engine shuts down while idling; Extended restart delays
Repairs/costs cited: Computer reprogrammed multiple times at dealer without resolution. Towed to dealer several times.
Recalls/TSBs owners mention: Dealer reprogrammed computer multiple times without success.
Engine motor mount leak
Right engine motor mount leaking at relatively low mileage. Owner questions if this is a defect and safety concern.
When: 42,333 miles
Symptoms owners cite: Leaking right engine motor mount
Secondary air injection and EVAP system failures
Emissions systems fail diagnostic testing. Secondary air injection system failure and EVAP vent control circuit failure recorded.
When: Not specified
Symptoms owners cite: Check engine light
Codes mentioned: Secondary air injection system failure, EVAP vent control circuit failure
Synthesized from 13 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Common questions
How serious is the engine problem on the 2005 Mercedes-Benz E-Class?
It's a documented issue but not catastrophic. 13 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Across the 11 complaints that reported odometer mileage, most engine failures cluster between 13,745 and 100,000 miles, with the median around 42,333. A quarter of owners report trouble before 13,745; a quarter make it past 100,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.