Your vehicle's MAP sensor plays a crucial role in keeping it performing at its best. Here's how it works and the warning signs that it might be failing.

Test for voltage at the plug connector as indicated in the photos and captions, and make sure the vacuum line to the MAP sensor isn't kinked, crushed, or leaking.

Last month, we kicked this series off by showing you how to save some money by diagnosing a bad MAP sensor rather than just chucking cash at new parts that may or may not fix a specific problem ...

One dirty sensor could be hurting your car’s performance — learn which one it is, the symptoms to watch for, and how to clean it easily.