Q: Code p0140 we replaced 02 sensor and catalatyic converter

asked by on

We replaced the catalatyic converter and the back 02 sensor and we checked the wiring for 12 v it's all good
My car has an automatic transmission.

The vehicle should have an original equipment HO2S not aftermarket generic. For a P0140 code, the wiring harness should be closely inspected for damage: chafing, pinches, melting, or water intrusion into connector. Exhaust leaks upstream of the HO2S must be eliminated as that can also cause this DTC. After all other possibilities have been eliminated, the PCM may turn out to be the root cause. An experienced mechanic performing scan tool diagnostics would be recommended at this point. A technician from YourMechanic can come to your home of office to thoroughly diagnose your Check Engine Light and make the correct repairs.

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. Code p0140 we replaced 02 sensor and catalatyic converter

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: Car dies when slowing down

A stalling while driving issue can be caused by multiple problems dealing with one or more of the following issues: lack of air flow to the motor (which could be caused by a blockage in the intake system), lack of...

Q: Q: Fuel injector misfiring

Hi there. This is a common problem with this vehicle. These vehicles often lack proficient injector functioning. A solution for this would be to have a certified mechanic replace the number six injector. Also a certified mechanic will test the...

Q: High pitch squeal/ loss of power, louder squeal w/o muffler. Not the cat

Hi there. We typically focus only on OEM applications and repair tips on this website. You might want to consult with a GM performance specialist or contact the cam manufacturer to ensure you followed the correct installation and break in...

Related articles

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...
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...