Skip the auto shop - Our mechanics make house calls

Q: Car runs rough below 40 MPH

asked by on

My car runs rough when driving below 40 MPH. The emission and low tire pressure lights are on, and I am getting OBD codes P0171, P0301, and P0316.

A: The code P0171 means that the engine runnin...

The code P0171 means that the engine running lean, which typically stems from a few possible sources: a faulty mass air flow sensor, or clogged intake manifold gaskets or fuel filter. The codes P0301 and P0316 can mean that cylinder number one is misfiring, which could stem from the coil. I recommend that you have a mechanic, such as one from YourMechanic, come to you and run a full diagnostic on your engine misfire issue, then estimate the repairs needed to fix your Windstar.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: I keep getting OBD-II codes P0171 and P0174

Since you have codes that both banks are lean then the problem will most likely be from air entering the intake manifold after the mass air sensor. The idle air control valve should not have any air leaks from the...

Q: Ignition coil pack is not firing (1 out of 3)

It is not uncommon for an ignition coil to fail. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeated as the copper beneath them expands and contracts much quicker than...

Q: loud constant click noise like machine gun kind of

This could be a variety of things potentially depending on where the sound is coming from. If this is coming from the engine area, this may be valve train noise. If not from the engine area, this may be related...

Related articles

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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...