2003 Hummer H2 Repair Question
Check engine light came on in my 2003 H2 Hummer. what do I do to find out why?
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.
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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.
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