This would be particularly dodgy but i have seen it happen.
A lot of main dealer services include a ecu flash as standard which often include any standard updates to software. They are supposed to get your explicit permission in circumstances where it includes and emission update and we have to have a copy on file for anything similar on the brand i work for. The customer is within their rights to refuse the update if they wish.
Remember all the vehicles which failed their emission tests due to either dodgy MOT setups or even just dodgy claims. Well the manufacturer got around it by doing recalls with software updates that hugely effected the vehicles fuelling and economy. Those issues havent gone away entirely and it wouldnt surprise me if they were hiding them in ecu flashes at service time......
Car manufacturer: Spends loads of time and money making the engine reliable and efficient
Backstreet remapper: Never mind all that, let me **** about with it, more power!
Spends loads of time and money making the engine
reliable and efficientpass the emissions test
