P013C and P013A codes

[tek302]

Anyone have issues with this? Just started happening. Ive driven on my flex fuel tune for close to 1k miles now.

Code for slow o2 response from rich to lean.

 

[tek302]

Surely some one has heard of this issue. Anyone else on a flex fuel having this issue?

 

[Shaun@AED]

Are you running anti-foulers on the rear O2's? Pulling the O2's away from the exhaust path can cause slow response.

 

[tek302]

Yes i am. Thanks Shaun. I have them double stacked. Guess i will try single and hope i can keep my monitors set.

 

[tek302]

Also why would it just now pop up though?