Q: P0171

asked by on August 24, 2016

I had a p0325 and p0171. I fixed the knock sensor but the lean bank 1 is killing me. I have replaced the MAF, PCV, FRONT O2 SENSOR, found one vac leak and replaced hose. STILL HAS P0171, What am I missing? HELP!!!!!!

My car has 188000 miles.
My car has an automatic transmission.

Check Engine Light is on Inspection $79.99 - $89.99 Get a Quote

The code P0171 is due to the left bank of the engine running lean and has reached the rich limit for the ECM. Try to have the injectors cleaned and run only high quality fuel that has cleaning additives. This should clean out the injectors and combustion chambers and clear the code. If you need help having this done, a certified technician from YourMechanic can inspect the code in person to determine the appropriate actions.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

Stalling

Hi there: The EVAP system is comprised of multiple components. Although the gas cap removal is the easiest job to complete and the source of many of these problems, another common issue is caused by the EVAP vent solenoid. When...

Surging idle and almost stalling on start up .

Hello there, many different faults can cause your 2000 Ford Expedition to have a surging idle and stalling issues. You have done great so far in your diagnosis and repairs thus far. There are a few other potential causes such...

Trouble shifting

Hi there. Over time, the components that connect the shifter to the gearbox will wear out and eventually break. A certified technicians would be able to remove the gear box to inspect the linkage and replace anything that has been...

My wheels lock up when I try to go in reverse.

Hello. If your transmission is no longer going in reverse, then there is likely an issue with the transmission. It may be possible that one of the shift solenoids or sensors that controls the shifting of the transmission has failed...

The gasket is deteriorated in the intake manifold gasket

If the gasket does have to be replaced it is replaced as a "whole". There is no partial intake manifold gasket. Please note that the code you are writing in about, Diagnostic Trouble Code P0171, can set for many reasons...

Car stuttering when starting and low gas mileage

Claimed by Tim Charlet

My car has low oil pressure. I've already changed the oil pressure sensor 3 times.

If you have replaced the sensor three times and it did not fix the problem, then you may have problems with the oil pressure being low at idle due to wear in the engine bearings. The reason it would be...

I was wondering if I could put 2003 dodge neon headlight assembly on a 2000 dodge neon

Yes, they are exact catalog interchanges.

EVAP Small Leak Code P0442 Lit MIL. Code cleared, has not reappeared. But, Diagnostic tool still shows Emission Related DTC's

In order for all the monitors to clear you will have to do a lot of driving to see if it clears. The last two to clear take highway driving at a steady speed to clear and may take a...

Related articles

P2302 OBD-II Trouble Code: Ignition Coil "A" Secondary Circuit
P2302 trouble code code definition P2302 is a general OBD2 diagnostic trouble code indicating a fault within the ignition coil A secondary...
P0153 OBD-II Trouble Code: 02 Sensor Circuit Slow Response (Bank 2 Sensor 1)
P0153 trouble code definition 02 Sensor Circuit Slow Response (Bank 2 Sensor 1) What the P0153 code means The P0153 trouble code...
Symptoms of a Bad or Failing Electronic Brake Control Module (EBCM)
Common signs include the ABS or Check Engine Lights coming on and the ABS or traction control systems malfunctioning.