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Old 09-26-2014, 06:05 PM   #1
iconio
1st Gear Newbie
 
Join Date: Sep 2014
Location: Vancouver
Posts: 24
Check Engine Light ON



Hey guys

I travelled and a friend of mine filled my gas tank for me when i was back. The car is running fine, but the check engine light just came on. I ran a test and apparently it's the bank 1 sensor 2 (bank1 sensor 1 was just replaced).

So. I believe he filled with regular gas instead of premium. Can that be the reason why I'm getting that "faulty" part therefore the check engine light on?

I haven't asked him because it was a nice thing from him and I don't want him to feel bad if it's a faulty part.

Thanks
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Old 09-26-2014, 10:28 PM   #2
TSI
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Join Date: Aug 2011
Location: Oakville
Posts: 1,298
Possible. Regular forces the ECU to retard timing to avoid detonation, thus probably upsetting the fuel maps and not burning the fuel optimally. As a result, more unburned gases go down the exhaust, and the O2 sensor picks them up. That would cause the O2 sensor to register either a voltage spike or drop, depending on the gases in question, and in turn the CEL would come on.

It won't kill your car, if you can clear the code, do so. Get the tank as close to empty as you can, and then fill with 91 and the light shouldn't come back on. If it does, the o2 sensor might've been overloaded and broke, although that is extremely rare.
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Old 09-27-2014, 12:28 AM   #3
iconio
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Join Date: Sep 2014
Location: Vancouver
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Thanks man... I'll do that.
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Old 10-15-2014, 12:20 PM   #4
iconio
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Join Date: Sep 2014
Location: Vancouver
Posts: 24
So i burned all the gas and filled up again. When I was running low on gas the check engine light was off but after I filled up the tank it came back on. I checked the cap and it was tight.

I drove again and the light would come on and off but as soon as I'm running low on gas the light doesn't come on.

Weird eh!
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Old 02-10-2016, 06:04 PM   #5
mobbsMachine
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Join Date: Jan 2016
Location: Ottawa ON Canada
Posts: 33
Sounds like an o2 sensor is going. That's were I would check
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