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.

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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Car runs rough below 40 MPH

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: Q: Check Engine light

The Check Engine Light will come on for a number of reasons. Since the light is on, I would start by scanning the computer for codes. The codes will help to isolate the problem. If the light is flashing, then...

Q: Error codes P0171 and P0374

Hello. These issues can be caused by a few things. From the codes it sounds like there may be an issue with the fuel system. It may also be an issue with the air intake system allowing too much air...

Q: My car feels like it's having trouble starting. I took it to someone and they ruled out the starter, battery, and alternator.

Hey there. This may be related to many different things. Depending on the symptoms, this may be related to a spark issue or potentially a fuel delivery issue. If the engine starts, we can reasonably assume that there is not...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...