That is where oxygen sensors come in. They are a crucial element of your system and require proper maintenance to keep fuel consumption, driveability problems, and emissions at bay. In this article, ...

Diagnostics An oxygen sensor that’s going bad or has failed altogether won’t always throw a check engine light or trip a diagnostic trouble code. Sometimes if there’s an internal problem ...

Modern garage shops aren’t guessing what’s wrong — they’re using a mix of tech, know-how, and good old-fashioned detective ...

Q: I have a 2002 Chevrolet Avalanche. The rear knock sensor light, p0322 has been coming on for a while. I bought two new sensors and a wiring harness. I ...

The oxygen sensor was replaced but the 'check engine' light won't go out. Now what? Which octane fuel is best? AAA's Car Doctor has answers.

Q: My 2000 Nissan Pathfinder was diagnosed with a knock sensor problem after a mechanic scanned the OBD2 codes. (The check engine light is on.) It did not pass the annual inspection.