Q: Q: P0171

asked by on

code P0717 keeps coming up sporadically. When the "check engine" light comes on the car shifts rough but when it goes away it runs fine. I checked the resistance of both input and output sensors and they both register the same 623 omhs. I don't mind replacing the sensor or both sensors but I'm not sure if that is cause of the problem. Do these sensors go out gradually or suddenly? Any suggestions?

My car has 86000 miles.
My car has an automatic transmission.

Hi there. This code you are getting is due to your system running lean. Most of the time, it is caused by low fuel pressure from a weak fuel pump or a clogged fuel filter. Another possible cause can be due to dirty injectors. I usually check these potential issues first to see if they are fine before checking the oxygen sensors. If the components turn out to be defective, they will need to be replaced. If you need this P0171 code checked, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair anything that is needed.

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: harm of replacing fuel filter

The fuel filter replacement will never be a bad thing. A clogged filter is worse.

Q: Oil leaking engine won't hold oil but car starts

As you know, an oil leak can range from somewhat minor to very serious depending on the location of the leak and how quickly it is leaking. I would recommend not starting the car at all until getting this leak...

Q: Car is starving for fuel sometimes but not always

Hi. The first question to ask is if the Check Engine Light is on. If so, what are the stored problem codes? These would be helpful for diagnostic purposes. Check your fuel pressure (while running and under load if possible)....

Related articles

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.