Skip the auto shop - Our mechanics make house calls

Q: Code P0171. Do I need to take car to dealership to address this problem.

asked by on

I have replaced spark plug wires, fuel filter, mass air flow sensor and it still runs rough.

My car has 165000 miles.
My car has an automatic transmission.

A: Hey there. It sounds like your throttle bod...

Hey there. It sounds like your throttle body is bad. Check to make sure it's clean and not sticking. Clean the throttle body if necessary and check for loose connections with the throttle body connectors, too. Since you said that you replaced the wires, make sure you have all of the connections properly seated and in the right place. If you need to have this checked, a qualified professional from YourMechanic inspect the rough running in order to have this properly taken care of.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
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・Save up to 30%

Get a quote

What others are asking

Q: Loss of power while driving and it feels like my car is bogging down - 1994 Chevrolet Camaro

Hello. The issues that you are having can be caused by a number of things. Most of the time, this is caused by a sensor issue. The most common sensor to cause this is the throttle position sensor. When this...

Q: No fire when starting my car

Hey There: Sorry to hear about the problem you're experiencing with your 97' Pontiac Firebird. What you're describing actually happened to an acquaintance of mine last year. He tried every trick in the book, including the "gas in the spray...

Q: Turning brights on causes the engine to die

Hi. This sounds like the the alternator is weak and is going bad. When you turn on the head lights, A/C system, or radio it puts a load on the alternator and the alternator should be able to handle this...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.