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 ...

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 ...

How many oxygen sensors does a typical car have, and what factors determine this number? Additionally, how do their placements affect engine performance and emissions control? Thomas Hello Thomas, the ...

How do you check if the oxygen sensor is working? I have a VX Commodore that is misfiring when idling. It was fine before it was stored in the shed for a few months, we have done coil packs, air ...

One of the biggest fears of any vehicle owner or driver is the dreaded Engine Warning Light, also known as the Check Engine Light. While there is a chance of a major fault, sometimes it is likely that ...

April is Car Care Awareness Month — and also National Canine Fitness Month, International Guitar Month and National Soft Pretzel Month, among many others — and the folks at CarMD are back with their ...