I got this code today
Below is what I found.......any suggestions?
P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously
monitors fuel delivery hardware. The test fails when the adaptive fuel
tables reach a rich calibrated limit. For lean and rich DTCs:
Excessive fuel pressure.
Leaking/contaminated fuel injectors.
Leaking fuel pressure regulator.
Low fuel pressure or running out of fuel.
Vapor recovery system.
Air leaks after the MAF.
Improperly seated engine oil dipstick.
Stuck EGR valve.
Leaking diaphragm or EVR.
Exhaust leaks before or near the HO2Ss.
A SHRTFT-1,2 PID value between -25% to +35% and a LONGFT-1,2 PID value
between -35% to +35% is acceptable. Reading beyond these values indicate a
Thats why those bastards charge a diagnostic fee at your dealer ship / shop.
You can have your codes pulled at pep boys for free but then what ?????
It is not that simple, is it.....
here we go
Possible a vacuum leak at your upper intake, there are updated gaskets and
bolts between the lower and upper intake.
Spray some brake cleaner on where the upper and lower intake meet and look
if the rpm's go up or down
Also check if the tube didnt come out of the rubber hose between the airbox
and trottle body.
There is also a pcm update that takes care of some of he p0171/072/073/0174
When was the last time you changed your fuel filter, if ever ??? check fuel
check if the vacuum line om the fuel regulator is not leaking vacuum on the
intake side, if you dont change your airfilter on time it will suck too much
oil residu thru the pcv in to the intake and all the rubber hose connections
on the intake will start to leak vacuum.
or 1 of the other things you mentioned
:-)) good luck
The check engine light came on 11/18 (two days ago). I have not noticed any
performance change at all. Idle is fine, acceleration is fine, cruise is
fine. AutoZone did the test for me and sold me a Bosch Oxegen Sensor
(13117), but the guy didn't sound convinced. It's still in the box for now.
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