Is there any way to know how much CO2 my old car is emitting?
The MOT does not have CO2 diagnostic equipment – it has CO diagnostic equipment. These are two different gases. CO2 is measured on the EU combined cycle fuel consumption test, and manufacturers have been required to publish it since 1997, although it was only added to UK registration documents in 2001. You should be able to find any car since 1997 on this site: http://www.smmtco2.co.uk/ However, CO2 is affected by only two things: the type of fuel used, and the amount of fuel used. It can be calculated reasonably accurately from the published fuel consumption figures, if the fuel type is known. If your car was manufactured before the current test cycle was introduced, it may not have been tested on the same cycle, so there may be no way of arriving at a figure that can be compared to those of new cars. Bear in mind that as the car ages it may start to use more fuel, and so emit more CO2, and also that the test cycle used is not the
