The MOT (Ministry of Transportation) here in the UK tests vehicles annually for their safety, exhaust emissions, and roadworthiness. This test applies to vehicles that are over 3 years old. This test isn't concerned with modifications (both cosmetic and performance-related) as long as the parameters of the MOT are met.
Still, there is a lot of speculation regarding this particular test online. Some claim that if you remap the ECU of your vehicle, it may not qualify during an MOT test. There are several articles and forums from individuals making this claim who pose themselves as MOT testers. These articles suggest that under the new VOSA (Vehicle and Operator Services Agency) regulations, vehicles with a remapped ECU will be failed. In this regard, the MOT had to issue statements suggesting otherwise. So is there any truth to these claims floating around the internet, Absolutely Not! It may be fairly easy to be misguided and deceived by such content. But in reality, your vehicle will do just fine during the MOT test if you remap its ECU.
It is important to understand here that what Remapping is. Remapping or Reflashing an ECU of your vehicle is fundamentally similar to fine-tuning it. The process of remapping involves switching the stock software of your vehicle's ECU with new or custom software designed to control your vehicle's turbocharger, ignition coil, fuel injectors, electronic sensors, and other such mechanical components. The only thing here that can affect an MOT test here is fueling. But practicality has shown that if something, remapping your vehicle's ECU can actually make its fuel burn more efficiently. This means that remapping can improve the emissions of your vehicle, even if by a fraction.
You might be thinking, what about all those stories online. There have been some cases where people reported that their vehicle failed the MOT emissions test after they remapped their ECU. This can only happen in one of two ways, the vehicle in question fell out of the required emissions band because of a low quality remap (which is highly unlikely). Secondly, and I hate to say this that the person is lying and there were other issues in the vehicle that resulted in the failing of the MOT test.
In conclusion, emissions are the only reason (in a very rare case) that a remap could lead to a vehicle failing the MOT test. So if you drive an Audi like me, it's better to get your vehicle's ECU remapped before going for an MOT test. Try searching for Audi ECU Remap to find Audi professional remapping services near you. There are no orders and policies from the EU which show new rules for the MOT test and effects on a vehicle after a remap. The only thing to consider here is emissions. Make sure your vehicle is handled by certified professionals. Any modifications while tuning your vehicle should not negatively affect it, emission wise.
Also Read: How Wrong Fuel in Your Car can Affect It
