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: I was driving down the road and my truck was running poorly then died. It will crank but not start.

Hi and thanks for contacting YourMechanic. Check the air filter for it is not dirty. It may sound silly, but if the air filter is dirty the engine will not start up. Starting fluid produces its own oxygen so you...

Q: hard to back up when van gets hot okay when it's cold

Hello, thank you for writing in. The vehicle is likely having issues with the transmission fluid. If you have not had the transmission serviced, it is time to check the level and condition of the fluid and replace the filter....

Q: Hard start hot and cold. Fuel pump, or throttle body?

If the throttle body was causing a hard start, then the engine would run with a loss of power all the time. The hard start could be caused by either the fuel pump not holding the fuel in the lines...

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 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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...