How to Diagnose the Check Engine on a VW Jetta?

Answer The "check engine" light on your VW Jetta comes on because there is regular maintenance required or there is a failure of one of your Jetta's critical engine, fuel or emissions components. The on-b... Read More »

Top Q&A For: How to Diagnose the Check Engine on a VW Jetta

Diagnose Check Engine Light Problems?

All vehicles from the mid-1970s to the present day use a central computer for engine management. This management is used to control all functions of the engine as well as making the vehicle environ... Read More »

How to Diagnose Your Check Engine Light Problem for Free?

Prior to 1996, different makes and models used different types of computer programming and self-diagnosis protocols collectively referred to as Onboard Diagnostics, Series I. These dozens of differ... Read More »

How to Diagnose Check Engine Light on 2002 Impala?

The check engine light on the 2002 Chevrolet Impala comes on when the computer stores a code, which happens when a component -- usually a sensor or sender -- malfunctions. Since you can't see when ... Read More »

How to Read the Check Engine Light of My Jetta?

Volkswagen Jettas sold in America have On Board Diagnostic (OBD) coding systems that are mandated by law. Europe also has a version of these codes, either way, if the "Check Engine" light has come... Read More »