I think Stage 1 is where you can clear by driving at +2k revs at more than 37mph etc, etc; Stage 2 is where they have to do a forced regen and Stage 3 is probably replacing the whole filter!
On the O2 sensor side - the first pic below shows my sooted up, blocked one; 2nd pic shows what it looked like when they cleaned it and 3rd pic shows the new type one which they now fit which shouldn't clog as much! 4th pic shows where the inlet O2 sensor is in the engine (just right of centre - near bulkhead).
On the Forced regen side I was surprised to hear that it would cost an hours labour @ £180 (£150 + VAT) to have carried out as not covered by warranty. Needless to say, I negotiated a discount and had the work done but wasn't too happy.
I was discussing the overall regen with the Workshop Manager and it's worth mentioning that regen will only work if you have more than a half full tank of diesel when doing a Stage 1 regen yourself (driving at +2k revs etc) and also a more than half full tank of AdBlue.
So final questions - is the more than half tank of diesel based on a standard 60 litre tank or a 75 litre one like mine + how on earth do you tell how much AdBlue you've got in its tank?
