Mot Failure On Emissions

[VANESSA]

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

Vanessa

[AliciaBeckman]

Hi,

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

[mintalkin]

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.

[stef123]

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?