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anyone run a fuel injector cleaner like something like techron (the ones that contain PEA) and got a check engine light?
i picked up a 2006 mazda 3 with the 2.3L and has about 95,000 miles on it. decided to run a tank of techron and got a check engine light half way thru. not sure if its related but was just curious. i dont have a scanner rn so i cant check but will in the next few days.

i assume maybe a piece of gunk or carbon that broke off hit an o2 sensor or something or maybe the fuel system doesnt like the cleaner or something.
 

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It's probably just a coincidence. It could also be that you didn't screw the gas cap on tight enough. Sometimes the ratcheting mechanism inside the gas cap get worn and it clicks too soon so the cap doesn't get tight enough. This can cause the check engine light to come on.
 
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