I'd like to upgrade the H7 high beam bulb and the 921 reverse bulb to LED's.

By doing this will it cause codes to come up ?

I have an 06 Mini Cooper S with HID headlamps.

Thanks, MiniKar

 

I searched the same topic, there's a lot of threads but the gist of it is this - some throw codes, some don't. You can add resistors to the LED wiring or use a scantool to remove the code/light (don't quote me on that last part though. I have no idea).

I just did LED blackjack scuttle lights, drove about 200 miles in two days without a problem w/ my 2004 Base

 

The blackjack t/s will not throw a code, they either have a resistor built in or are wired in series to create enough basic resistance, as far as reverse lights & highbeams, hmmm, the reverse lights only being on when they are shouldn't be an issue, but I never tried it, I did however try a tail light bulb swap once, no code, but it just wasn't bright enough for me, as far as the high beam, I would think you wouldn't want one, led's are liminesent but don't actually emit / throw light for a great distance, you may be better off with a color match hologen or an HID upgrade.