[yokata]

Guys my 335n55 with bm3 st2 catless dp start throwing some error code after i stop driving the car cuz i have new one and old is for sale now.Ive tried to disable this error code with bm3 but nothing happens.ive changed the lambda and it was fine for 2-3 weeks and now start poping again pls help if someone had the same issue.

[thejeremyman9]

So you changed the O2 sensor (the second one right?) and the code came back 2-3 weeks later? Did you let the car fully warm up and drive for a bit and see if the code persists?

Might be worth taking a look at the wiring.

Also, don't disable a legitimate code just because you get a CEL for it lol...

[yokata]

Originally Posted by thejeremyman9

So you changed the O2 sensor (the second one right?) and the code came back 2-3 weeks later? Did you let the car fully warm up and drive for a bit and see if the code persists?

Might be worth taking a look at the wiring.

Also, don't disable a legitimate code just because you get a CEL for it lol...

I really dont know which one exactly my mechanic changed but yeah i start the car from time to time just to keep battery alive and this shit pops up again ill check the wiring tomorrow but its strange how the problem was fixed and now again, ofc it happen when one guy comes to buy the car and i look like idiot...

[thejeremyman9]

Originally Posted by yokata

I really dont know which one exactly my mechanic changed but yeah i start the car from time to time just to keep battery alive and this shit pops up again ill check the wiring tomorrow but its strange how the problem was fixed and now again, ofc it happen when one guy comes to buy the car and i look like idiot...

You might want to drive the car around for a full heat cycle and not just start and idle it, if that's what you are doing. So drive for 10-15 mins until oil is up to full temp for example (just a benchmark to know everything is warmed up, oil temp wont directly affect that code), and see if the code comes back.

Include a little WOT as well.

[yokata]

Originally Posted by thejeremyman9

You might want to drive the car around for a full heat cycle and not just start and idle it, if that's what you are doing. So drive for 10-15 mins until oil is up to full temp for example (just a benchmark to know everything is warmed up, oil temp wont directly affect that code), and see if the code comes back.

Include a little WOT as well.

I drive it for around 15-20 min after i clear the code ,and after restart it pops up again

[thejeremyman9]

Look at this thread: https://f80.bimmerpost.com/forums/sh....php?t=1159645

Its possible you had one sensor replaced, and now the other one needs to be replaced?

[yokata]

Thanks ill check it.

[pw0n]

I have the same error code. First got it when I switched to catless, but it disappeared on its own after awhile.

I recently switched to catted, and it returned - except this time, it isn't clearing on its own. However, doesn't seem to affect performance, so I haven't bothered fixing it.

[thejeremyman9]

Originally Posted by pw0n

I have the same error code. First got it when I switched to catless, but it disappeared on its own after awhile.

I recently switched to catted, and it returned - except this time, it isn't clearing on its own. However, doesn't seem to affect performance, so I haven't bothered fixing it.

It looks to be for the secondary O2 (after cat), so no, it should not affect performance.