[nuke21]

My car is originally from CA. I love in Idaho. I had a code recently come up, P2570, Environmental Air Catalyst Sensor. Idaho is not a SULEV state so I do not require this. To remove this check engine code I would have to buy a new radiator and sensor. I am annoyed with the thought of even doing this because why create waste for something that works fine.

Is there a way to remove CA specific stuff from the programming? Also if I did this would my car think I don't have this radiator and sensor therefore turning off this check engine light code?

[ctuna]

If you have an Sulev car it has specific hardware and specific
software to run as an Sulev . Even the Engine has different major
components that make the compression rate lower .

There is nothing practical you can do to change that .
By the way sulev cars were not a CA requirement.

[kolhozbrothers]

There is an aftermarket company that makes a high quality Sulev radiators for N51 engines. Probably the coating inside your radiator is no good and the sensor cannot read properly. You will have to buy a new aftermarket radiator and swap your old sensor or buy a new OEM radiator. They don't sell sensors separately.

[dpaul]

SULEV warranty on emission components is 150K miles/15 years. Just take it to a dealer.

And insist because many dealers do not understand the SULEV warranty. A 2009 328i with N51 engine originally sold in CA is covered by BMW under the SULEV warrenty regardless of its current registration.