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Mot Failure On Emissions

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Posted 10 January 2011 - 08:35 PM

Hi, I have a 2002 Ford Fiesta Zetec and it has failed its MOT on the Offside Rear Exhaust emissions carbon monoxide content after 2nd fast idle excessive. The garage I took it to said they could not diagnose the problem and advised I book it into a Ford garage for diagnosis. In the meantime I thought I would try my local Kwik fit to which they carried out the following tests and could not resolve the problem:
1. Changed air filter
2. Fuel Treatment added
3. Lamda ( sensor 2 ) ( Rear ) changed: Reversed readings from CO high to Lamda high / CO low
4.Repaired broken pipe ( vacuum) from fuel rail
5. Refit clips to air filter housing and induction piping
6. Run OBD diagnostic ( no errors stored)

They have written on their report:
Vacuum noise coming from right hand connection of fuel rail. Maybe allowing excess air into return system

Any suggestions to what could be the direct problem before I put it into a Ford garage ?

Thank you

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#2 AliciaBeckman



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Posted 11 January 2011 - 08:35 AM


Welcome to the Ford forum. Hope u enjoy ur stay here.

#3 mintalkin


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Posted 11 January 2011 - 04:04 PM

i would not trust kwik fit to blow up a pushbike tyre never mind work on a car,did they use ford lambarda sensors as some other make are not up to the job, find a good independant garage to give the car a look over, it will be cheaper than fords.

#4 stef123


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Posted 11 January 2011 - 04:14 PM

hmm, is the second (post cat) lambda sensor not just for diagnostic purposes? the pre cat one is what determines the mixture for the ecu?

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