Need help

[Aldo0280]

Iv got an 07 335 & cannot get the catalytic converter monitor to ready no matter what i do! Ive done every drive cycle i can find ive done the specific bmw drive cycle probably 20 times or more ive driven thousands of miles ive changed the oil replaced all the coil packs & plugs, ive replaced the downstream oxygen sensors, i actually have 2 diff dme's & im running the original non-tuned dme. Idk what else to do i live in California so i can only have the evap monitor not ready. All my other monitors are ready only other thing obviously i can do is replace the catalytic converters but i really dont think there is anything wrong with them? Anyone have any ideas as to what i can do besides replacing the catalytic converters which i will do if it will fix my problem? Ive been messing with this for months now my car reg expired at the end of January & i cant get my tags till i get it smogged. Any advice would be very much appreciated thank you!

[JDStrickland]

My F150 was throwing CAT codes because there was a loose muffler bearing. Have you done any exhaust work and perhaps the downstream sensors are being affected?

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You said, "the" converter, as if there is only one. There are two. There is only one monitor though....

[marvinstockman]

Have you tried doing a Google search on, 'catalytic converter not ready for emissions'. Lots of links show up.

[relative4]

Have you checked the temps at the entries and exits of the cats?

Are you gonna eat that?