Hey guys here is my info.

05 rx8 with 171k miles. Engine replaced at 145k. I'm completely stock other than greddy mufflers and bhr midpipe with no cat.

I check my engine codes frequently since I have no cat. I got a new code today - P2270 ... Does anyone have any ideas what this is?

It says O2S 1/2 signal stuck open. I just replaced my o2 sensor that's normally in the cat. Is this code the o2 sensor before the cat?

And help I appreciate it.

 

https://www.rx8club.com/new-member-f...t-here-202454/
post #6 has the full CEL list

P2270 - Rear HO2S signal stuck lean

This is the O2 that is in the cat. Looks like you might have a wiring problem with that replacement.

 

OK - I will check this out tomorrow....thank you so much!!