Car failed emissions test

[Matthew-1985]

I had my car (97 Ford Escort) MOTed yesterday and it failed on a few things, all cheap apart from the emissions which I was told could be cheap to fix of could cost a lot depending what is wrong.

The main thing is it is giving out a lot of CO. The calues were.

Fast idle test

CO: Limit < 0.30% Vol Actual 5.03% Vol

Second fast idle test

CO: Limit < 0.30% Vol Actual 8.19% Vol

Natural idle test

CO: Limit <0.50% Vol Actual 4.73% Vol

Anyone here know what could be wrong? And would it really be worth doing?

Thanks.

 

[Matthew-1985]

My 1995 1.6 Fiesta Si Failed its emmisions test a few weeks back.

Problem was that the Lambda sensor had been worn to the point it was giving false info to the ECU and using way to much fuel!

Got that replaced and all was sorted.

The sensor for my car costs about £120 from ford.

Hope that helps

Mine does seem to use a lot of fuel as well (I think). It's done about 166 miles on 3/4 of a 55 litre tank.