CHECK ENGINE LIGHT CAME ON IN MY 2003 H2 HUMMER. WHAT DO I DO TO FIND OUT WHY?
2003 Hummer H2
Just looked at the gauges and noticed the check engine light was on. It's ready for an oil change. I reset the % until I can change the oil. Would that be the problem?
Thursday, December 15th, 2011 AT 4:38 AM
That won't be a problem. However, make sure you don't forget. Also, when you do change it, reset the computer again.
MAKE SURE THE OIL LEVEL IS FULL.
Thursday, December 15th, 2011 AT 4:40 AM
To address the check engine light, you need to have a diagnostic system check of the powertrain. This can be done at most auto part chains. Regular occurrences involve a faulty catalyst(P0420/430), vent system performance(P0446), or oxygen sensor heater circuit faults. As a primary visual you can do yourself, check that the fuel cap is fully installed.