How do you know which O2 sensor is bad? Let's find out
So, your check engine light just popped on, and after a quick scan, you've realized it's an oxygen sensor issue, but now you're stuck wondering how do you know which o2 sensor is bad when your car might have four of them. It's a common headache. You don't want to waste money replacing parts that are still working perfectly fine, but you also don't want your gas mileage to tank or your car to fail its next emissions test. ...