Let's begin with the basics here: An automotive oxygen sensor is part of the exhaust system and does what its name implies, sensing how much oxygen is in the exhaust gases. And that's important for at ...

If you want to know more than one thing, you need more than one sensor. In fact, many engines today have not just two oxygen sensors, but four.

QUESTION: I own a 1999 Buick Century. The indicator that shows gear position does not light up, and at night I cannot see what gear I am in. Is this an expensive repair and worth getting fixed? ANSWER ...

Your vehicle's O2 sensor plays a significant role in its performance and if it's faulty, it's not something you should ignore. Here's what you need to know.