Can anyone help?, my Hyundai coupe 1997 1.6 16V has failed the MOT for emissions. The co2 reading is far too high and fluctuates between 0 & 500+ it is also impossible to hold it at 2000 revs. as it drops down after a couple of seconds. Also the tailpipe is sooted up with black!. I have tried the obvious like plugs, air filter etc. Would appreciate any comments. thanks, Jake

 

To squeek it by emissions testing make sure the car is warmed up and then try it. BMW's won't pass emissions cold, I don't know why it just doesn't.

 

if you O2 sensor is faulty it will be compensating with more fuel, im guessing ur HC's are high also?? ur cat could also be on the way out!