High Emission-MOT Fail

[fraz101]

Can anyone give me any idea why my car failed it's emissions....i have phs 1 172 with the double catalyst
Fast idle Test
High CO 4.56
High HC 1176
Low Lamba 0.881

2nd fast idle test
High CO 8.71
High HC 2128
Low Lamba 0.736

Exhaust has a slight leak from joint at back box but didn't fail for this.....

 

[fraz101]

Just to add to this, i've tested the Lambda sensor signal wire and it appears to be fluctuating between 0.1v-0.9v at idle,however it seems to be sticking when i hold revs at 2500rpm?

 

[Diagro]

change it

 

[Addicted]

Did you warm it up before it went in?

 

[fraz101]

Did you warm it up before it went in?

Yes but it probably cooled down by the time they got to it

 

[fraz101]

Nobody wanna offer any help!!!

 

[Tony Hunter]

Seems to me, you've been told to change the lambda sensor, and make sure it hot/warm when they test it.

 

[fraz101]

Cant really control when the garage MOT my car unfortunately......besides i can't really see how that would cause those types of readings,if every car they emission tested were like that i think VOSA would be asking questions!!!!

 

[Tony Hunter]

I have to take mine in red hot for it to pass.

 

[fraz101]

ok,but my car has passed for the last 10 years by me dropping it off and leaving it with them!

 

[STEVE.M]

Can anyone give me any idea why my car failed it's emissions....i have phs 1 172 with the double catalyst
Fast idle Test
High CO 4.56
High HC 1176
Low Lamba 0.881

2nd fast idle test
High CO 8.71
High HC 2128
Low Lamba 0.736

Exhaust has a slight leak from joint at back box but didn't fail for this.....

Did he ask you how you are going to vote tomorrow?

 

[fraz101]

Did he ask you how you are going to vote tomrrow?

???

 

[STEVE.M]

???

It was a simple enough question.Did he ask,Yes or No?Wrong answer gets you a Fail.

 

[mark smith87]

Get the car Terraclean treated. My 172 had high emmissions last year. Had it treated and CO was 0 HC 6 after treatment.

 

[Diagro]

Just change the Lambda... Its a £35 sensor from ebay.

 

[fraz101]

Can anyone give me any idea why my car failed it's emissions....i have phs 1 172 with the double catalyst
Fast idle Test
High CO 4.56
High HC 1176
Low Lamba 0.881

2nd fast idle test
High CO 8.71
High HC 2128
Low Lamba 0.736

Exhaust has a slight leak from joint at back box but didn't fail for this.....

Just to update this incase someone else has similar readings,it was the Lambda sensor that was faulty.

 

[Tony Hunter]

Glad you got it sorted.

 

[johnbuck]

Just to update this incase someone else has similar readings,it was the Lambda sensor that was faulty.

Thanks for that, just back from MOT failure for similar emissions readings as yours. I'll change the Lambda and hope!!