P0171

[patsfan4life]

P0171 is the CEL i am throwing consistantly. I thought it was the EGR leak, but i fixed that and now it is back. What or where is the sensor that picks that code up and how do i fix it.

[Matthew1785]

P0171 is the CEL i am throwing consistantly. I thought it was the EGR leak, but i fixed that and now it is back. What or where is the sensor that picks that code up and how do i fix it.


Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.

SymptomsYou will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.

CausesA code P0171 may mean that one or more of the following has happened:

The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters (K&N, etc.) can cause the MAF to become dirty if the filter is over-oiled
There could be a vacuum leak downstream of the MAF sensor.

[njaremka]

keep an eye on that one, as it could mean you need a new MAF sensor. you COULD try pulling it out and cleaning it.