![]() ![]() The p0174 code on a ford f150 will often be thrown if the fuel injection system is not operating properly. Pulled EGR valve and lines to visually check. P0174 indicates Bank 2 of the engine has a lean fuel mixture. Hello all, Veh came in with p0171 bank 1 lean. I have cleaned the maf sensor and also installed a new pc valve. ecm shows correction for condition in short and long term fuel trim. of 4: Troubleshooting P0171 and P0174 (Ford 4. ![]() When I park my truck it has begun to idle up to 1500 - 2000 rpm's. It virtually ALWAYS indicates a bad sensor and can be confirmed with a graph of the O2Sb1s1 where you will not get full sine wave It may show only half cycles high – which will NOT trigger the P0171 code. If the problem persists, the front oxygen (O2) sensor may need to be replaced. Checking the Long Term Fuel Trim values (for Bank 1 and Bank 2) with your Scan Tool in Live Data mode. Otherwise, for long-term lean mixture, the code p0171 is registered according to an indication of the. I recommend using a digital multimeter but an analog multimeter can also be used.
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