o2 sensor https://amzn.to/49iLuKP
Sensor 1 is a PITA to replace since it’s way up in the motor. I had no problems with the downstream sensors on my M45 but the upstream were a PITA.
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Sensor 1 is a PITA to replace since it’s way up in the motor. I had no problems with the downstream sensors on my M45 but the upstream were a PITA.