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'Check engine' light. Which octane to use. Electric cars - Conferenciaanpei

‘Check engine’ light. Which octane to use. Electric cars

Q: In my vehicle, the check engine light comes on and then goes off and it

Q: In my vehicle, the check engine light comes on and then goes off and it is now back on.

I had a test done at local auto-parts store that showed a code of PO138. They told me this indicates a problem with the oxygen sensor. I replaced the oxygen sensor and the light never went out.

I contacted the mechanic that services my vehicle when I can’t, and he said codes don’t always indicate what is wrong. Now what do I do?  

A: Computer fault codes can sometimes be misleading, even to the best technician.

There is a specific troubleshooting procedure that needs to be followed for correct diagnosis and repair. The sensor will never work correctly if the wiring to and from the sensor has a problem. A technician will usually check for proper voltage and grounds to the sensor. Even a new sensor with a faulty ground circuit will not function properly.