Skip the auto shop - Our mechanics make house calls

Q: P0140, P0191, P2000. I put a new oxygen sensor in

asked by on

2011 6.7 the first code P0140 came own at 59000 mils.. i put in a o2 sensor myself at 70000 mil. the came on i put in a new O2 sensor in. at 74000 mil. the light came on took the truck to a dealer they put in wiring harness oxygen sensor overlay.at 77000 mil. the light came on back to dealer . they cleaned and swapped O2 places.at 80000 mil. light came on back to a new dealer this time replaced o2 module .now about a little over a week the is back on the new codes are P0140, P0191. p2000 can you help

My car has 80000 miles.
My car has an automatic transmission.

Hi there. These codes are coming on for a possible fuel pressure issue that could also be causing the catalytic converter to burn too hot. Check the fuel rail pressure and make sure that the pressure does not exceed minimum pressure of 4,000. Careful with checking the pressure, the rail can produce pressures up to 26,000 psi.

Make sure that you use a gauge that can handle very high pressure. Check the fuel rail pressure sensor for resistance with the engine running. If the resistance is not moving when throttling the engine, then the fuel fail pressure sensor needs replaced. If you need further assistance troubleshooting your vehicle, then seek out a technician, such as one from YourMechanic, that can pinpoint the cause for each code and proceed with proper adjustments or repairs.

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: Stalling out

Hi There, It sounds like you may have one or two possible issues. This may be related to a faulty MAP sensor which is causing the engine to stall as soon as a load is put on it. The other...

Q: Brake lights on constantly

It sounds like you have a short in your brake light circuit. Since you have replaced the brake switch yourself, I would recommend searching around in that general area for any damaged wiring that may exist near the switch. Wires...

Q: Cherry red catalytic converter.

Hi there. Usually, oxygen sensors do not cause this problem, but if the oxygen sensor itself is causing the truck to run lean, then that could cause this issue. If the oxygen sensor is bad, the Check Engine light...

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 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...
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...