P0171 Diagnostic Trouble Code Discussion for September 2026
Fuel System Lean (Bank 1)
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| Help Request | Posted | |
| 2021 Chevrolet Malibu LT 1.5L MIL Lamp on VIN: 1G1ZD5ST3N P0171: System lean. ... with a 1.5 engine, with a P0171 code. I cannot seem to find this problem. When it was brought to me the mass air flow sensor was replaced, the down stream o2 sensor was replaced. I've replaced all the pcv valves I took the valve cover off and replaced ... |
September 03, 2026 | |
| 2011 Honda CR-V LX 2.4L Poor Idle Quality, MIL Lamp on VIN: JHLRE4H33B P0171: lean bank 1. ... vehicle. Got this older, higher mileage CRV in for a CEL diag with a bit of a rough run. Scan and got the P0171 fault. Found the MAF reading low at 1.6g/s and MAP reading high at 1.1v, lambda at 1.47 and the downstream O2 is flatlined. Short-term and ... |
September 15, 2026 |
