Quote:
Originally Posted by CO4x499
I installed a new battery and the engine is now throwing - P0171 -> P0101 -> P0138. Prior to the battery install I had never had a CEL come on since I've owned it. It's a 2008 with 180k miles on it.
I don't notice much other than little shake/knock at low RPM after starting up. Once it's warmed up, it seems to go away.
This is based off the scan from AutoZone
P0171 -System too Lean (A/F Lean, Bank 1)
Secondary DTCs
P0101 - Mass or Volume Air Flow Circuit Range/Performance
P0138 - Oxygen Sensor Circuit High Voltage Bank 1 Sensor 2
I replaced my MAF with a Denso (bought of Amazon and assume it's real). Any advice on what my next steps should be? Based off what I've read it could be a whole slew of things - O2 sensor, fuel injectors, manifold leak, or other vacuum leaks.
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tried resetting the MIL, disconnect the battery for 15mins...then reconnect, start the car and relearn/idle for 7minutes
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