HID lights: Specifically those aftermarket kits that give the very bright headlight beams. Any cars found with these kits will be an automatic MOT failure. Testers are able to easily spot the difference between HID kits, and manufacturer fitted Xenon’s. Easy to spot as Xenon cars have suspension level sensors, in car beam adjuster, and usually headlight washers.
Chipped ECU’s: Unsure of just how/if this one will realistically be enforced, but any cars with chipped ECU’s will in theory be an MOT failure. I can only assume VOSA have found an easy way of checking ECU software through the cars OBD port (diagnostic plug). Some ECU's also contain a checksum which identifies whether they have been flashed or re-programmed...
Wiring harness: The general condition of he wiring harness will be checked to make sure there is no rubbing or chaffing, and that the harnesses are in generally good condition. If unsecure, or damaged again MOT failure.
Warning lights: If any warning lights are illuminated, it will again be an MOT failure.
The only one that I'm really glad about is the HID lights - nothing worse than a wee fud in his chavved out car blinding oncoming traffic!..
I also found this exert which relates to the above:
1. Assessment of defects and definitions
In the framework of the implementation of Directive 2009/40/EC, this recommendation lists the vehicle systems and components to be tested and the guidelines which Member States are recommended to apply during roadworthiness tests to determine whether the condition of the vehicle is acceptable.
MAJOR DEFECTS (MaD)
Defects that may prejudice the safety of the vehicle or put other road users at risk and other more significant non- compliances. Further use of the vehicle on the road without repair of the detected defects is subject to conditions. The competent authorities in the Member States must adopt a procedure for setting the conditions under which the vehicle may be used before passing another roadworthiness test.
Compliance with requirements (a)
Headlamps
4.1.4 a) Lamp, emitted colour, position or intensity not in accordance with the requirements (a). MiD, MaD
6.1.9. Engine performance
(a) Control unit illegal modified. MaD
(b) Illegal engine modification. MaD
Notes:
(a) ‘requirements’ are laid down by type-approval requirements at the date of approval, first registration service as well as retrofitting obligations or national legislation in the country of registration.
( b ) (X) Identifies items which are related to the condition of the vehicle and its suitability for use on the road but which are not considered essential in a periodic inspection.
source: http://eur-lex.europa.eu/LexUriServ/Lex ... 096:EN:PDF
