Chick Posted Thursday at 09:59 PM Posted Thursday at 09:59 PM Hi I have a problem with my 2018 A1 as the MPG has fallen off the cliff. I have used a code reader to find the fault codes which have returned after deleting and road testing. The codes are P2177 system lean off bank 1 and P0133 O2 sensor circuit slow to respond bank 1. Any help with these fault codes would be most appreciated.
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