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 ...

Q-I have a 1985 Buick LaSabre with 110,000 miles on it. I do some minor maintenance myself, such as changing the oil and filter, so I do have some mechanical knowledge. With as many miles as the car ...

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 ...