Kiestler Posted August 25, 2021 Report Share Posted August 25, 2021 (edited) P0171 and P0174. Bank 1and 2 lean . Fuel rail pressures are fine . What next? The check engine light comes on during idle, I filled up yesterday. It’s not a gas cap thing. I don’t have a cap. Edited August 25, 2021 by Kiestler Quote Link to comment Share on other sites More sharing options...
1004ron Posted August 26, 2021 Report Share Posted August 26, 2021 1 hour ago, Kiestler said: P0171 and P0174. Bank 1and 2 lean . Fuel rail pressures are fine . What next? The check engine light comes on during idle, I filled up yesterday. It’s not a gas cap thing. I don’t have a cap. What made you think that it needed the MAF replaced? Quote Link to comment Share on other sites More sharing options...
Kiestler Posted August 26, 2021 Author Report Share Posted August 26, 2021 That’s what a Ford dealer said and I wasn’t paying them $300. So I replaced it Quote Link to comment Share on other sites More sharing options...
1004ron Posted August 26, 2021 Report Share Posted August 26, 2021 7 minutes ago, Kiestler said: That’s what a Ford dealer said and I wasn’t paying them $300. So I replaced it I wouldn't use them again. The MAF is not typically the cause of those codes - an intake manifold vacuum leak is more likely. It would be better to take it to a reputable dealership or independent shop to get it diagnosed - you could throw parts at it and get lucky, but that normally costs more in the end. Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted August 28, 2021 Report Share Posted August 28, 2021 Fuel System: Ethanol content in the fuel Fuel filter plugged or dirty Damaged or worn fuel pump Leaking fuel pump check valve Leaking or contaminated fuel injectors Low fuel pressure or running out of fuel Evaporative emission (EVAP) canister purge valve is leaking when the canister is clean Fuel supply line restricted Fuel rail pressure (FRP) sensor bias Exhaust System: Exhaust leaks in the exhaust manifold gasket or mating gaskets before or near the heated oxygen sensor (HO2S) EGR System: Vacuum hose disconnected on exhaust gas recirculation (EGR) system module (ESM) applications EGR valve tube or gasket leak EGR vacuum regulator solenoid leak Intake Air System: Air leaks after the mass air flow (MAF) sensor Vacuum leaks Positive crankcase ventilation (PCV) system is leaking or the valve is stuck open Incorrectly seated engine oil dipstick Intake air turbulence due to incorrect air filter Damaged or contaminated MAF sensor Quote Link to comment Share on other sites More sharing options...
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