How to Diagnose Your Check Engine Light Problem for Free?

Answer 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 »

Top Q&A For: How to Diagnose Your Check Engine Light Problem...

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 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 Diagnose the Check Engine Light on a 2004 Explorer Sport Trac?

When your 2004 Explorer Sport Trac's check-engine light comes on, you need to diagnose the problem immediately. The check-engine light can indicate a serious problem with your Sport Trac's emission... Read More »

How to Know if the Check Engine Light is an Emission Problem?

The "check engine" light is perhaps the most confusing of all indicators on your dashboard. It is part of your car's On Board Diagnostic (OBD) system. When it detects a problem in the electronic co... Read More »