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So I tried upgrading my reverse light bulb but an error came up on the dash so I put the old one back in. It was supposed to be canbus error free and I only tried the left side. However, since then my brake light warning has come up and unsure what to do. My brake lights are LED and are working...

So I'm hoping to get a Revo remap soon and wanted to know what health checks should be carried out before the map. I previously had a golf mk5 gti stage 1 by R tec and they changed my DV and PCV before the remap. It was pushing a healthy 250bhp and I would have gone back to them but they can't...