You already did step 1.
Step 2:
Acording to the service manual, for the MIL indicator (Check Engine) to iluminate, the error needs to be detected three times by the PCM. After that, it will stay there indefeneatly for the tech to read.
The PCM Will store the info untill:
1. the codes are read and deleted with a scanner
2. the unit looses power.
After repairs, the technitian would connect the scanner again and "Clear all Codes".
try this:
Disconnect the negative cable from the batery for a few seconds. reconect. Drive it for a while and see if the code shows up.
If the fuel cap was the culprit, it will not light up. If there is still an error detected, it will light up again.
Ian
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