Coding out O2 Sensors?

[BNPhan21]

Hi I have recently bought a AA stage 2 M3 with a cat delete and I am getting increased emissions warnings with the following codes:

0027C6 and 002726

indicating that the O2 Sensors need to be replaced. I took it back to the dealer to have the sensors replaced and the codes came back after about 100 miles. Is there a way to code out these error codes on your own? I have a Carly adapter. The dealer I got it from says that I would need to get a dyno tune to code out the error but I feel like there has to be another way... Any help would be appreciated!

[Cbozz]

Originally Posted by BNPhan21

Hi I have recently bought a AA stage 2 M3 with a cat delete and I am getting increased emissions warnings with the following codes:

0027C6 and 002726

indicating that the O2 Sensors need to be replaced. I took it back to the dealer to have the sensors replaced and the codes came back after about 100 miles. Is there a way to code out these error codes on your own? I have a Carly adapter. The dealer I got it from says that I would need to get a dyno tune to code out the error but I feel like there has to be another way... Any help would be appreciated!

tune my friend, or you can get a mini cat extensions from fabspeed

[JsL]

The codes you posted talk about fuel trim, so I would go back to who tuned your car (seems like you purchased it with the sc already installed) and have them check it out.

Simply masking the code without understanding why it's popping up is not wise.

[BPMSport]

Originally Posted by JsL

The codes you posted talk about fuel trim, so I would go back to who tuned your car (seems like you purchased it with the sc already installed) and have them check it out.

Simply masking the code without understanding why it's popping up is not wise.

This.

Those are not errors that should be masked.

[pbonsalb]

Why should one worry about coding out rear 02 sensors on a catless car? I would not do it because my understanding is that coding them out would not allow readiness and my inspection required OBD2 plug in. As I understand, they need to be simulated in order to show readiness. If you are in a state that does not require OBD2 inspection, then coding out the rear 02 should work assuming coding them out is possible.

[JsL]

Originally Posted by pbonsalb

Why should one worry about coding out rear 02 sensors on a catless car? I would not do it because my understanding is that coding them out would not allow readiness and my inspection required OBD2 plug in. As I understand, they need to be simulated in order to show readiness. If you are in a state that does not require OBD2 inspection, then coding out the rear 02 should work assuming coding them out is possible.

0027C6 and 002726 = not ok to code out, something maybe wrong

P0420 and P0430 = cat efficiency code due to running catless, ok to code out. This is "coding out O2 sensors" and is not the codes the OP is getting.