LTFT B1 reads 29.7 and never changes with rpm's LTFT B2 reads 3.5 + or - and fluctuates with rpm s FTST B1 READS 5.97 FTST B2 READS 8.22 O2S BANK 1 SENSOR 1 VOLTAGE READS. Definition Both of these codes are generic, which means they have the same meaningP0171 2005 Ford F150 4.2 V6 sets P0171 code only. When they appear together, it indicates that the entire engine is running lean. By themselves, these are some of the most common OBD2 codes. oroton bag P0171 and P0174 both indicate that there is a lean condition present in your Ford Fusion. If the problem persists the front oxygen (O2) sensor may need to be replaced. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. "/>| Code P0171 2004 Ford F150 Tech Notes If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak.
If it needs to correct more than that, the P0171 code will be stored. The O2 sensors have the ability to correct a fuel mixture of +-15%. The P0171 code indicates that the Oxygen (O2) sensor on bank 1 sent a signal to the engine control module that the air-fuel mixture is too lean to correct it.
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