P0629 Diagnostic Trouble Code Discussion for July 2026
Fuel Pump Relay Control Circuit High
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| Help Request | Posted | |
| 2011 Mercedes-Benz E550 5.5L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: WDDKK7CF6B P0629: Combustion misfiring has been detected. Two random cylinders are always misfiring after startup. Sometimes on the same bank and sometimes on opposite banks. I replaced all spark plugs and smoke tested for vacuum leaks. The intake manifold had a leak. Upon removing the manifold I saw a puddle of ... |
July 06, 2026 |
