diagnostics help needed Cornwall

That's why you buy from somewhere that knows what they're talking about and are reliable and honest (unlike VW) Classic Car LEDs dealers with the VW Transporter (T5) Camper lot so has some experience with VWs. You can ask what's in the bulbs on offer, on the site it used to warn about VWs being awkward but speaking to the chap reassured me.

The factory fitted 21w incandescent DLR bulb on my wife's car had a singed socket, which the car's computer system hadn't detected or warned about when I noticed how discoloured the bulb was. Yet twice the same system gave a warning and amber triangle of doom for a brake light, then just went away of it's own accord, first time I checked and changed the bulb just in case, second time I just left it as one of the VW computer's brain-farts and it hasn't returned since. But it's another reason I don't go for the very bright bulbs as their bottoms can get as hot as the incandescent bulbs which takes away one of the LED advantages to my mind.

Saw the back of 74 plate something modern oversized "small" "SUV" tank thing, great display of bright rear lights even on bright sunny day but when the brake lights came on you could see the indicator light - brilliant aesthetic design maybe but not practical.