2002 Mercedes S600 V12NA Misfire Codes P204E/P2043/P204A/P204B/P204F/P2047/P2082/P2050/P2052/P2054 - Causes, Solutions & Catalytic Converter Damage
Hi everyone, I recently took my 2002 Mercedes S600 V12NA for a drive and noticed the check engine light was on. After scanning with a non-STAR device, I received several misfire and sensor-related codes: - P204E: Misfire detected in cylinder 8 (corresponds to P0308) - P2043: System-wide misfire (P0300) - P204A: Misfire in cylinder 7 (P0307) - P204B: Misfire in cylinder 11 (P0311) - P204F: Misfire in cylinder 10 (P0310) - P2047: Misfire in cylinder 6 (P0306) - P2082: Right bank upstream O2 sensor (cylinder 4–6) showing aging with low voltage signal (P0130) - P2050: Misfire causing damage to the three-way catalytic converter (P0300) - P2052: Misfire in cylinder 5 damaging TWC (P0305) - P2054: Misfire in cylinder 6 damaging TWC (P0306) In the past, the engine light would occasionally come on when driving without warming up, but it would go off after a few days if I warmed the engine before driving. I cleared the codes using the scanner and drove about 20 miles. The check engine light returned. While the vehicle runs smoothly with no vibration or overheating, the CEL remains active. One suggestion was to replace the upstream O2 sensors—specifically both left and right bank sensors. Should I do this? I'm also considering replacing both side MAF (Mass Air Flow) sensors even though no direct fault code points to them. Is that a reasonable step given the misfire patterns? My spark plugs were replaced at 90,000 miles—now at 122,000 miles, should I replace them again? Are there any signs of catalytic converter damage already? Do any of these codes indicate a failing catalytic converter or TWC failure? Although the misfires appear random, could this be due to faulty voltage transformers or coil pack issues instead of spark plug problems? Any insights on how to prioritize repairs for this 2002 S600 V12NA would be greatly appreciated. Thank you! Set
I'm not sure about diesel exhaust fluid injector resistance specs, as that applies to diesel engines. For your 2002 Mercedes S600 V12NA with a gasoline engine, the relevant components are spark plugs, O2 sensors, and coil packs. Focus on addressing misfire codes like P204E through P2054 first—these point strongly to faulty ignition system components (coil packs or spark plugs) or upstream oxygen sensor degradation. Replacing both bank O2 sensors is a good step for P2082 and TWC protection. MAF sensor replacement may help if there's airflow inconsistency, but it’s less likely without related codes. At 122k miles, spark plug replacement is reasonable—especially given the history of misfires. Check for catalytic converter damage using diagnostic data or exhaust emissions testing; P2050/P2052/P2054 suggest TWC exposure to high misfire levels, which could indicate early degradation. Prioritize coil pack and O2 sensor replacement before considering MAF or full system rebuild.