Engine Light Coming on....Very strange

[PG01]

Which engine do you have, RPO code?

I have flex, im just sayin theres no sticker on my 13 and since I bought it new i dont think anyone unstickered it.

 

[PPV12HOE]

0420 and or 0430 probably. Your o2sendors not liking the super gas. Unless the engine is tuned I would stick with 87

and yes, every few years i get same codes in my 13 hoe but i use 91-93 all the time...

edit: sorry, it is probably 015b or 015d delayed response from either 02 sensor

P0420 and p0430 both deal with catalyst efficiency... not o2 sensors...

 

[PG01]

P0420 and p0430 both deal with catalyst efficiency... not o2 sensors...

If you would have read just a little itty bitty more.....you would have seen that fixed myself with and edit a few minutes after I originally posted because i knew i mis-typed ....
i know what 0420-30 are and your statement is both right and wrong. While its true that it deals with cat efficiency it is getting those values from the 02 sensors and if you have a faulty 02 sensor it can throw a 0420 code but yes normally means its a bad cat.

 

[Randy Hill]

I did some research on octane ratings in the past, which turned out to be the opposite of what I thought I knew.
Octane retards the combustion process- that's why higher octanes are used for higher compression engines that tend to pre-detonate.
If you use higher octane fuel than you need, you are actually sending unburned fuel out the exhaust and helping carbon to build up in your engine.
The best thing you can do is to use the lowest octane fuel that runs without your engine pinging - this is best for both economy and power. I proved this to myself with a road bike by tracking several tanks of each fuel.
I think your engine lights may have been the result of this unburned fuel, and that seems to agree with the way the light went out with lower octane fuel.

 

[Butch Coleman]

0420 and or 0430 probably. Your o2sendors not liking the super gas. Unless the engine is tuned I would stick with 87

and yes, every few years i get same codes in my 13 hoe but i use 91-93 all the time...

edit: sorry, it is probably 015b or 015d delayed response from either 02 sensor

I had the codes pulled the first time this happened in late 2018 and I no longer know what codes they were. I did not have the codes pulled this time.

The problem may have something to do with mixing even small amounts of ethanol with methanol( non ethanol gas). It seems to cause a film to form on carb and injector parts, possibly 02 sensors?