Anyone else had issues with 200 cel aftermarket headers and getting a check engine light?

I bought these second hand but might try to reach out to Kline for help. They have short 02 spacers on the back sensor too.

I reset the codes PO431, PO421, and they came back after a few drives.

 

Yes. I had just the P0421 code which I think is only on the passenger side O2.

I have since added an O2 spacer from Fabspeed. Hasn’t been an issue since. But I also have a device to clear the code if it comes up.

 

I would just grab some of these and call it a day.

https://flat6motorsports.com/product...rsal-o2-spacer

 

i think that’s the direction I’ll go. Appreciate it.

I thought all headers with 200 cell count would be safe but obviously not.

 

I have kline exhaust, headers and 100 CEL cats with no issues