Check engine light from too low octane gas?

Crypty · 12-21-2012, 03:10 PM

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.

krnnerdboy · 12-21-2012, 05:08 PM

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

12-21-2012, 03:10 PM	#1
Crypty Private First Class 48 Rep 178 Posts Drives: '08 e92 M3 Join Date: Jul 2012 Location: NJ iTrader: (1)	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
krnnerdboy Colonel 192 Rep 2,431 Posts Drives: v10 m6 Join Date: Nov 2008 Location: so cal iTrader: (10)	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 __________________ F80 m3, 997 gt3, 14 ram ctd, f15 x5, drz400sm Gone:z4m, boss 302, c6 z06, m6,z3m
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