Modern cars rely on a dense web of sensors to manage everything from fuel delivery to collision avoidance, and when one fails, the result can range from a minor annoyance to a four-figure repair. I ...

Your car’s O2 sensor can be cleaned if you’re in a pinch, but cleaning won’t make an old sensor reliable again. Most failing sensors must be replaced.

Modern vehicles are pretty complicated pieces of tech. Apart from emissions and other vital functions, the engine control system relies heavily on several sensors to regulate performance. That is ...