W211 AMG Discuss the W211 AMG's such as the E55 and the E63

P0155 P0055 Woes

Old Feb 15, 2026 | 11:30 PM
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2007 e63 AMG
P0155 P0055 Woes

Bought my w211 e63 a couple months ago, and it came with the p0055 code triggering the CEL. It has American Racing long tube headers and a Renntech tune.
I replaced the O2 sensor (Bosch) where the code was being thrown, but the CEL never went away. About two weeks ago, my e63 went into limp mode and threw misfire codes for 306,307,308. I replaced all the ignition coils and replaced spark plugs as well.

I haven’t had any misfires since, but I noticed a rough idle and read the codes and a P0155 has now popped up alongside the P0055.

I believe both these codes are for faulty heater circuits in bank 1 and 2?
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