Quote:
Originally Posted by CO4x499
I installed a new battery and the engine is now throwing - P0171 -> P0101 -> P0138.
I had it scanned it at 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 and cleaned the throttle body. Any advice on what my next steps should be? Based on 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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I'd recommend checking for any vacuum leaks in the intake system. Those could be causing the lean condition (P0171) based on the symptoms. Check out the hoses, gaskets, and fittings for any wear or disconnection.
Next, give the O2 sensor wiring and connections a once-over. Make sure there's no damage or loose connections. Since you already swapped out the MAF, the P0101 might be tied to wiring or connectors too.
If the issue persists, check the fuel injectors for proper functioning. A clogged or malfunctioning injector could be causing the lean condition.
