Quote:
Originally Posted by eutecticpt
Just bought a 1999 Maxima SE. The wife put about 10 gallons of 87 octane when the low fuel light came on. I filled the tank with 93 octane and checked the fuel cap, but the SES light stays on. Had the OBD scanned and came up with O2 sensor and Knock Sensor codes. I authorized the shop to clean the fuel system--they did not say this would clear the SES light--but I went ahead and had it done. There are no drivabilty issues. Could the lower octane trigger the SES light?
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The low octane gas caused your engine to knock. Your engine detected the knocking and set the SES light. I am surprised it would happen with only one tank of gas, but these engines (at least mine) knocks badly with anything less than premium.
I am not sure why the O2 sensor was on, but my guess is that it didn't have anything to do with using regular gas. Do you know what the code was for the O2 sensor?
Cleaning the fuel system has no affect on the knocking. Unfortunately that was probably a waste of money. Or should I say an investment in your local auto shop
Either get the actual codes, or run through a couple tankfuls of premium.