my c180 kompressor merc failed its national car test emissions test. I'll have to get rid of it if I can't fix it. The results are this.
Low idle: engine oil temperature 106C
(780 rpm). CO 2.12vol%. Above 0.30% FAIL
HC 88ppm


High Idle. Lambda 0.93
(2.940 rpm). CO 2.69 vol%
HC 87 ppm.

My merc has 209000km on the clock and is driving quite well, would be a shame to have to get rid of it. My mechanic says it could be a host of various things and fixing one thing might not get it past the NCT (test).
Any person have an idea how to rectify same.