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      12-21-2012, 03:10 PM   #1
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Check engine light from too low octane gas?

Can lower than spec'd octane gas in a car cause the CEL to come on? I put some brand-x 89 in a car that takes 91. CEL came on, though it drove fine. I balanced the mix with some 93 and soon after the CEL went back out.

Last edited by Crypty; 12-21-2012 at 04:44 PM.
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      12-21-2012, 05:08 PM   #2
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That can only be caused if the lower octane caused a misfire. Random misfire lights go off on their own but are still stored in the ecu. Get a reader and if its a random misfire code, there in lies your issue

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