P0171 Diagnostic Trouble Code Discussion for March 2025
Fuel System Lean (Bank 1)
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| Help Request | Posted | |
| 1997 Ford Ranger XLT 4.0L MIL Lamp on VIN: 1FTDR15X8V P0171: lean bank 1. Truck came to us with a high and unstable idle 1250-1600 RPM.Scan p017 and p0174 lean codes present. Smoke test found Iac leaking, replaced Iac idle was slightly better but not much. Re-smoked found EGR valve leaking, Replaced Egr valve, idle better but st... |
March 12, 2025 | |
| 2014 Mazda CX-5 Touring 2.5L MIL Lamp on VIN: JM3KE4CYXE P0171: System lean. ... car. The Evap code p0442 sets because the fuel pump is leaking fuel vapors under the fuel pump ring. I have a new pump on order, but I have not been able to figure out the lean condition. Short term fuel Trim at idle is +5 to +8 but long term is ... |
March 13, 2025 |
