P0171 Diagnostic Trouble Code Discussion for April 2025
Fuel System Lean (Bank 1)
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| Help Request | Posted | |
| 2018 Infiniti QX60 3.5L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on, Lean VIN: 5N1DL0MN9J P0171: B1 lean. Vehicle came in to me several months ago with a rough idle when cold and customer simply wanted spark plugs replaced as it had over 160,000 miles on the original set. Car came back a few weeks later with a bank two lean condition. Replaced multiple vacuum ... |
April 05, 2025 | |
| 2015 Chevrolet Malibu LTZ 2.5L MIL Lamp on VIN: 1G11F5SL4F P0171: Fuel Trim System Too Lean Bank 1. Not worried about the p0013. That was a simple fix. I have this car that came in for a failed smog. Initially thought I got it nailed because all the intake bolts were very loose. Tightened up and smoke tested the intake. No more vacuum leaks but it sure a... |
April 07, 2025 | |
| 2021 Chevrolet Malibu LS 1.5L Lean VIN: 1G1ZD5ST4M P0171: Lean Long term fuel trim 36. I got this car from another shop with P0089. They replaced the pcm. I reinstalled the original pcm and replaced the high pressure fuel pump. Fuel rail pressure at idle now is about 540 psi. P1101 also present. I cleaned the throttle body and relearned idle... |
April 28, 2025 |
