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Yes, thats the problem nowadays as most garages don't understand the concept of exhaust emissions. It either passes the MOT set emissions or it doesn't I have seen many garages dispose of perfectly good oxygen sensors because they failed (or couldn't be bothered to see the relevance) to notice an exhaust leak which draws air to the sensor which then overfuels and 'hey presto' there is your problem. I have sometimes measure the oxygen level after fitting a new exhaust to see that there is no leaks present and the repair has been done properly, takes all of 2 to 3 minutes as the emissions machine is running all day on standby. Sorry, rant over but motor vehicle fundamentals seem to have been completely forgotten over the past 10 to 20 years and replacement of perfectly good (and expensive) components seem to be the name of the game. most MOT emissions analysers have a 'Pre-MOT Test' function in the background where you can run it to check 5 gas and Lambda readings prior to testing for the MOT but not many people would use it or know its there or even understand the readings and how they determine the actual faults