Regarding the MOT limits - the emissions machines do a BET "basic emissions test" first. Most cars usually pass this. If these basic test readings are not met however the tester has to select the correct listing from the data-base - this is the "in service emissions" list mentioned. This sort of widens the goal-posts in many situations and can assist with passing. Some testers select the wrong listing which doesn't help! Over my years of MOT testing, with the Rover V8 engine ( in land-rover products mainly) i have found it helps to make sure the engine ( and exhaust cats ) are really really hot. Often range rovers of early 90s vintage seem very marginal on emissions - revving them usually scrapes them through.
Old petrol doesn't help by the way either - we are seeing this lately with cars that have sat more idle than usual due to this years restrictions. Odd emissions readings and poor running etc.
Last edited by andymot; 15/10/20 09:01 PM. Reason: spellings again
