My car has just failed it's MOT with very high emissions figures.
Does anyone have any idea what might be wrong, or where to best start?
Fast idle test 1 - 3000 rpm
CO = 4.08% (0.3 max allowed)
HC = 432ppm (200 max allowed)
Lambda = 0.904 (0.97-1.030 required)
Fast idle test 2 - 3000rpm
CO = 4.09% (0.3 max allowed!)
HC = 486ppm (200 max allowed)
Lambda = 0.895 (0.97-1.030 required)
CO = 3.17 (0.50 max allowed)
Any help appreciated,