I can’t code USDM lights on my MK3. Can anyone help me?

Jun 19, 2025
1
0
Hello guys, I’ve bought my first car a Seat Leon MK3 1.4 FR. After some time I wanted to do a few mods with the lights with light coding. I bought an OBD11, but Everytime that I try to enable USDM it says error. I’ve seen somewhere that I need to change the BCM. Has anyone done this in the past or if you guys know what I should do?
 

SRGTD

Active Member
May 26, 2014
2,721
1,573
Hi @Bobbybuilder - I see from you’re from the UK from your country flag below your avatar and forum name. USDM (United States Domestic Market) setting that uses orange indicators as daytime running lights isn’t legal in the UK and that might be why you get an error when you try to enable USDM.

With USDM light setting, you might also get stopped by the police and you could get a fine, or at best an informal warning.
 
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