When this part isn't working properly, it can lead to a significant 40 percent decrease in fuel economy. And we all know that less mpg means one has to spend more money at the gas station. Plus, when this part is faulty it may cause engine damage and bothersome performance problems. What part is it exactly?

The oxygen sensor.

If your check engine light is on and you notice that your car is having performance issues, like hesitation when you try to accelerate, rough idling or even stalling, a bad O2 sensor may be to blame. Along with this, another noticeable and common symptom of a failing O2 sensor is pinging, which can cause expensive damage to engine pistons when left unchecked.

In addition to maintaining top fuel economy ratings and optimal performance, if you want to protect your engine, oxygen sensor replacement in Phoenix is imperative. If you hear pinging, also known as knocking, pre-ignition and detonation, you should have your vehicle checked out immediately. It sort of sounds like marbles or rocks bouncing around in the engine.

Furthermore, the Environmental Protection Agency (EPA) states that a significant number of smog test failures are due to defective O2 sensors that cause cars to release excessive emissions, which negatively impact the environment.

If you think your car's oxygen sensor is faulty, or if your check engine light is on and you want to have it checked without paying a lot for the test, visit Camelback Ford for a free check engine light diagnosis in Phoenix, Ariz.