[simsimma120]

I’ve got a JB4 installed with catless R44 downpipes, they have the little simulator built in so the car thinks there is still a converter installed. I got a CEL at first with two codes, but realized I had not plugged the JB4 back in after doing the XHP flash. Cleared the codes and no more CEL but did a scan and still getting the 12AF20. My shop was very careful not to damage 02 sensor during install, but it’s still showing. Car runs and drives fine, wondering if this is something we need to track down and fix or if it’s just a code we will get related to the downpipe.

12AF20 lambda probe after catalytic converter:signal
Fixed on grease

[corbs09]

Are you sure they plugged it in right? Did they use the little spacer washer for the simulators? Just FYI the simulators won't solve the problem, you will still get a CEL from time to time.

It is a different CEL than the code you are showing so it leads me to believe there is something up with your sensor itself. Mine showed a 12BB01 and 12BC01 for the downpipes.

[simsimma120]

Originally Posted by corbs09

Are you sure they plugged it in right? Did they use the little spacer washer for the simulators? Just FYI the simulators won't solve the problem, you will still get a CEL from time to time.

It is a different CEL than the code you are showing so it leads me to believe there is something up with your sensor itself. Mine showed a 12BB01 and 12BC01 for the downpipes.

We are going to check the 02 sensors and now i just got the 12BC01, lambda probe after catalyst 2 from lean to fat delayed reaction. Same one you had?

The downpipes have built in simulator so not sure if spacer was used or not i wasn’t there during install.

[VagabondG82]

Originally Posted by corbs09

Are you sure they plugged it in right? Did they use the little spacer washer for the simulators? Just FYI the simulators won't solve the problem, you will still get a CEL from time to time.

It is a different CEL than the code you are showing so it leads me to believe there is something up with your sensor itself. Mine showed a 12BB01 and 12BC01 for the downpipes.

Were you able to get these codes to stay off for long enough to clear the permanent system monitoring? Mine re-appear every time I cruise on the highway.

[simsimma120]

Originally Posted by VagabondG82

Were you able to get these codes to stay off for long enough to clear the permanent system monitoring? Mine re-appear every time I cruise on the highway.

It’s been off for two days now, feel pretty confident it’s nothing to worry about, but i don’t know how to clear the permanent system monitoring