Emissions trouble

My 2009 Jaguar X-TYPE 2.0D has failed the MOT on an emission range from 2.79-4.07. The turbo was changed five years ago, after a refurbished one failed when the seals went in just over a year. This was changed partly under warranty. My garage is evasive as to what the problem might be without testing further – which would cost me more money – mentioning the EGR valve, injectors, turbo and swirl flaps, even though this car doesn’t have swirl flaps! In the past I have removed the intake, so I know there are no swirl flaps. There is a slight leak, but I am not sure if it’s a turbo leak as the turbo doesn’t whine and I can see that the actuator is working. Any ideas on why the readings are so high? Would the EGR valve or injectors cause this?

Also, when I accelerate hard up an incline there is a puff of smoke as the turbo comes in, then it doesn’t seem to happen again.

Albert Kirby

Without seeing the full range of figures from the test, it is difficult to pinpoint a cause, but generally a fault in the EGR system or a weeping or faulty injector would be the most likely culprit with your X-TYPE. Cleaning the EGR valve may be a good start, as would trying an additive in the fuel tank and giving the Jaguar a good run. If the vehicle is only used for urban driving, the systems may become clogged with carbon. In these circumstances using an additive accompanied by a good run may bring down the emissions to an acceptable level. Another option would be to use a service such as flexfuelcompany.co.uk to clean the carbon deposits from the engine, which could return the emission levels to within the permitted limits. JAGUAR X-TYPE