my works insignia was going into limp home mode, eventually im told (after various garages filling me with doom and gloom stories about needing a new ecu, turbo, dpf etc etc)the dpf is known to clog up with soot and need a good blast to regen and clear itself. apparently im not driving it hard enough..... obviously 120 down the m74 and m6 from Glasgow to Liverpool is taking it to easy!
ill need to remember that the next time I get stopped speeding! "the mechanic told me I had to officer or my car would blow up"