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p0155

  1. Riddle with 3 SES codes...

    General E46 Forum
    Help me solve this problem. My SES light came on sunday, so I dropped by autozone to see what was up. They were as follows: P0155 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1) P0171 System too Lean (Bank 1) P0174 System too Lean (Bank 2) I have had the P0155 go off before and was...
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