Q: Q: P0171

asked by on

Its an 02 f150 lightning i put headers and cats on it new 02s new coilpacks new spark plugs all the intake gaskets and supercharger gaskets new vacuum lines new fuel filter and im getting ready to buy a new ecui even did the line that comes out the back of the intercooler housing thats most common to give u these codes i just keep getting the p0171 and dont know what else to do just wondering if you might know something else i may have missed

My car has 76000 miles.
My car has an automatic transmission.

The cause behind diagnostic trouble code P0171 is easiest to find by looking at the secondary firing patterns on the Bank one cylinders. That will confirm if the too lean condition, that has caused the code to set, affects all cylinders in the bank. If not all cylinders are affected, test for defective individual fuel injectors. However, if all cylinders are affected, you would test, in turn: the fuel pressure regulator, fuel pump pressure, check for a clogged fuel filter, vacuum leak, faulty oxygen sensor(s) and faulty mass air flow sensor. Rarely, the cause will be a faulty powertrain control module. If you want these steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a check engine light diagnostic - code P0171 and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
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

Get a quote

What others are asking

Q: I have air pockets in my cooling system how do I get them out

The cooling system does not need any special procedures to get the air out of the system except to have the heater to on and warm setting. This will allow the coolant to flow through the heater core and out...

Q: how long does it take to fix the center bearing driveshaft when in the shop

Hi there. That's very difficult to answer due to the multiple variables involved in removing and replacing hard to access components such as the center driveshaft on a front wheel drive vehicle like your Edge. However, in general, this type...

Q: I am about to replace engine in my 1998 lincoln nav it had 240 thousand miles i have an engine trying to find a good e to have it

To remove and replace the complete engine, the labor time is in the range of 14 to 18 hours . The variance is due to different requirements in the 4WD version versus the RWD version and there are at least...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...