Code PO13B and PO13D

[pbonsalb]

The Idrive says increased emissions. The cheap scanner says PO13B and PO13D, which are post cat 02 codes. Car is catless, has 02 modifier in tune. The only thing I could find on these codes is this from the link below

"Note that before a malfunction for trim control is set, a validation of front and post oxygen sensor is performed through introducing a rich/ lean shift.

The plausibility/ rationality check of the post – catalyst oxygen sensor covers four diagnostic strategies:
-Diagnostic during fuel cut off, to verify if the signal is below a certain threshold while in fuel cut off (P013E/ P014A) -Diagnostic during fuel cut off, validation of the transition time (P013A/ P013C)
-Diagnostic during re-injection after fuel cut off, validation of the signal gradient (P013B/ P013D)
-Diagnostic during wide open throttle, to verify if the signal climbs above a certain threshold in WOT (P0136/ P0156)"

http://www.m3post.com/forums/showthr...D#post11648934

[jcolley]

Originally Posted by pbonsalb

The Idrive says increased emissions. The cheap scanner says PO13B and PO13D, which are post cat 02 codes. Car is catless, has 02 modifier in tune. The only thing I could find on these codes is this from the link below

"Note that before a malfunction for trim control is set, a validation of front and post oxygen sensor is performed through introducing a rich/ lean shift.

The plausibility/ rationality check of the post – catalyst oxygen sensor covers four diagnostic strategies:
-Diagnostic during fuel cut off, to verify if the signal is below a certain threshold while in fuel cut off (P013E/ P014A) -Diagnostic during fuel cut off, validation of the transition time (P013A/ P013C)
-Diagnostic during re-injection after fuel cut off, validation of the signal gradient (P013B/ P013D)
-Diagnostic during wide open throttle, to verify if the signal climbs above a certain threshold in WOT (P0136/ P0156)"

http://www.m3post.com/forums/showthr...D#post11648934

When you say O2 modifier in tune, I believe you mean to get rid of the SES and Increased emissions error due to being catless, correct?

If so, all it does remove the P-code entries for the cat efficiency errors. The post-cat O2 sensors still function. That specific error is part of the subroutine that checks to make sure the post-cats are functioning properly and it does so by monitoring the sensor return voltage and expecting to see a rise in voltage (proportional to NOX gases) when the engine goes from an off-throttle condition to back on the throttle.

How is the condition / age of the post-cats?