The Check Engine Light may illuminate due to an evaporative emission (EVAP) system fault. Our technicians tell us these EVAP system faults can be difficult to diagnose but it is not uncommon to find a failed charcoal canister or a loose or worn gas cap.
Problems for specific Toyota Corolla years:
Car problem reports
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Most reported 1999 Toyota Corolla problems
There are occasional reports of daytime running light problems.