bad gas messed up o2 sensor? - Lexus IS Forum
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post #1 of 5 (permalink) Old 07-21-2017, 04:51 PM Thread Starter
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bad gas messed up o2 sensor?

i have after market header with stock y pipe, had it replaced over a year ago, and i used spacers for the o2 sensors to not get a check engine light. Had no issues. 3 days ago i was almost on E and had to us 89 octane gas in a rush. Now i got a check engine/track off light. Reset it thinking it was bad gas, went to work, filled up with 93, and drove home and the light came back on again.

I got a code p0430. Now, which sensor is this one again (sorry havent had emission issues in a while and forgot).

Should i blame this on bad gas, or could it be that my o2 sensor is just done. My 04 is300 does have 175k miles. but i find it coincidental that this all happened 1 day after putting in lower octane gasoline.

BTW im using big daddies spacers, not the cheapo autozone ones.
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post #2 of 5 (permalink) Old 07-21-2017, 05:25 PM
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Same thing happened to me in 2014. I've got aftermarket headers too (with cats). I ran out of gas in the middle of nowhere and had to get some from an old tank. I got the p0430 code the same day, and have been fighting it since. It's the B2S2 sensor, and replacing the sensor didn't help. Either the gas ruined my cats, or I suspect I have an oil leak into the exhaust.
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post #3 of 5 (permalink) Old 07-22-2017, 05:59 AM
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It is the cat. If the sensor was bad you would get more codes..
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post #4 of 5 (permalink) Old 07-22-2017, 07:44 PM
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Either the gas ruined my cats, or I suspect I have an oil leak into the exhaust.
You can test the cats with an IR thermometer. Check youtube for the method. How many miles are on the cats?

Mis-firing can ruin cats. Anytime raw gas gets on the cats it can damage them.
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post #5 of 5 (permalink) Old 07-23-2017, 04:12 AM Thread Starter
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so in my case, it is not the o2 sensor? is it just that the spacers arent cutting it any more.

What other codes would be thrown is the o2 b2s2 was bad? is there any chance that it could still be bad and JUST throw a p0430??
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