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Ah I see - the UK is a little more forgiving when it comes to this sort of thing. It also helps if you know the MOT tester ? With headlights, as long as you have the correct beam pattern and have it adjusted to the correct height - you are fine. The daft thing is, as long as you have the correct spec at the time of the test, you are then free to go home and change it back again!
Mike Dobkin replied to acer54's topic in 9PA, 9PA1 (Cayenne, Cayenne S, Cayenne Turbo, Cayenne Turbo S)Almost certainly a coding issue in my opinion, especially as you mention the PCM was changed.
I can understand why reflector headlights can create glare when converted to HID but projector headlights are ideal for the conversion. I have done it a few times on different cars with no problems.
You might consider installing one of the many HID upgrade kits which are available on Ebay, Amazon etc. They are a vast improvement and do not require coding
There is a very quick and easy solution - fit one of these ..... https://www.amazon.co.uk/EL16-Headlight-Bluetooth-Control-Leaving/dp/B07MYVWQKV/ref=sr_1_6?keywords=auto+light+cayenne&qid=1557308880&quartzVehicle=92-1192&replacementKeywords=auto+light&s=gateway&sr=8-6 Five minutes to install and works great - you have more control over individual iights too