Quote:
Originally Posted by Boston4
P0420 and P0492 are generic codes that you'd get from a generic reader like at the inspection station. The BMW cat failure codes, 29F4 and 29F5, indicate catalytic converter efficiency is below the threshold for both banks.
I had both 29F4 and 29F5 on my N51 in 2022 at 90k miles, and the dealer (I went to BMW Norwood because the Herb Chambers BMW Boston was backed up at the time) replaced both cats for free.
As long as you're covered by the SULEV warranty then they should cover both issues.
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Edit: nvm, they called, and warranty is valid; both cats replaced