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Old 04-05-2013, 02:48 PM   #1
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Low Octane and O2

Can placing a lower octane then the car is tuned for cause the o2 sensor to go bad?
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Old 04-05-2013, 02:53 PM   #2
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Idk about the O2 sensor going bad but you will get a lot of pinging in your engine.
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Old 04-05-2013, 03:02 PM   #3
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Idk about the O2 sensor going bad but you will get a lot of pinging in your engine.
I'm getting P2195 quite often, before I change the sensor I was just wondering if this can happen. I put the wrong gas in about 2 tanks ago. I'm still having some peformance issues.
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Old 04-05-2013, 03:35 PM   #4
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Wrong gas? You guys have octane ratings lower than 87?
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Old 04-05-2013, 03:47 PM   #5
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Are you running the stock tune?? Our cars run on 87 normally!? What do you mean by "wrong gas"?
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Old 04-05-2013, 03:50 PM   #6
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Are you running the stock tune?? Our cars run on 87 normally!? What do you mean by "wrong gas"?
I was running a 93 race tune and I accidentally put 90 octane in
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Old 04-05-2013, 03:53 PM   #7
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I was running a 93 race tune and I accidentally put 90 octane in
Ohhh, O.k. makes sense now. I'm still factory tuned, for now! Someone will chime in shortly I'm sure that can help you out. Sorry.
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Old 04-05-2013, 03:54 PM   #8
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You won't be ruining oxygen sensors that way. Worst case is you run too much timing and ping. Best add some octane boost to the tank.
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Old 04-05-2013, 03:57 PM   #9
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My 2012 is running 91race tune and I still use 87 octane. Have been for at least 2 months. I haven't had an issue, so it may be a deeper issue than whischng your octane one time
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Old 04-05-2013, 04:22 PM   #10
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I agree, probably something else going on. Re-load the tune or switch tunes if you have already replaced the O2 sensors. Just make sure you have a very clean air filter, new-ish plugs, no air or vacuum leaks, ect.. see what changes
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Old 04-05-2013, 04:24 PM   #11
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I haven't changed the o2 yet, I read in another forum where some had the same code I'm getting and they changed the sensor and it fixed the problem. New plugs will be here next week. I'll change those and swap the suspect o2 and see what happens.
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Old 04-05-2013, 05:50 PM   #12
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Eventually it will hurt the engine cuz the timimg is forcibly tuned for that 93 octane and ur putting a lot less. I would simply retune it for 87s and add 90octane gas. Then after two tanks of 90 retune the car for ur race tune and put 93 like stated for the tune
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Old 04-29-2013, 02:05 AM   #13
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***UPDATE*** So, I swapped the o2 sensors and used some fuel system cleaner. The misfires still happened but they weren't nearly as bad as they were. A few days later o2 sensors code came back, except on the other side. I replaced the sensor and so far no codes. I think I got it. Lessoned learned though, 93 ONLY for me. 93, 91 tunes.
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Old 04-30-2013, 10:03 PM   #14
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I just want to throw out there that the proper way to handle this is to load a tune for the octane you accidentally put in as soon as posable... Not doing this is a silly way to put your engine in danger... Even though the car seems to run ok now it doesn't mean everything is ok... It like cancer, everything is ok then you might get a little cough so you go to the doctor and BAM, your clock is ticking son.

Time to start kemo... Load a proper octane tune and hope you got it in time...

Hopefully that comes off as funny and not insulting... I'm going to stop drinking now
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