Here is the OBD device compatible and recommended for your Pontiac G4 (2005 - 2006)
KLAVKARR 210

List of lights handled by the klavkarr 210 on your Pontiac G4





Why is the engine fault light on in your Pontiac?
The engine fault light is a dashboard warning light that is part of your Pontiac G4 car alert system . It illuminates to signal a potential issue with the engine.
But what exactly is an engine fault?
It can range from minor issues that don't prevent you from driving to more serious malfunctions that can affect engine performance or, in the worst case, cause irreversible damage.
What should you do if a warning light comes on in your Pontiac G4
If you encounter an engine fault or other issues (airbag, abs, esp, etc.), our advice would be to act cautiously and find out the root of the problem causing the light to illuminate. You can diagnose the fault with a diagnostic tool compatible with your Pontiac to learn more about this issue.