Lambda sensor

[Wooju]

Hello, 

 

My Citigo failed the MOT today due to high emissions. 

 

CO limit 0.2 mine is 0.9

Lambda limit 0.97 - 1.03 mine showed 1.23

 

I assusme lambda sensor is the one to be blmamed. I connected vcds and showed no errors. 

I know some values can be checked using vcds. Could somebody suggest how to do it and what values are correct? 

 

Thank you in advace

Peter

[Gyp]

Son's Citigo failed similarly last week.

 

Garage ran a bottle of cataclean through it and it passed

 

https://www.halfords.com/motoring/engine-oils-and-fluids/fuel-and-oil-additives/cataclean-500ml-616247.html

 

 

[freemansteve]

The sensors are probably fine. Your engine is either running a little rich or is burning oil, or the catalyst is below par.

Sometimes taking the car on a long high-speed run can help the catalyst. As Gyp says, a cleaner may work sometimes too.

 

[Wooju]

Hello, 

Appologies for a late reply.

Thank you gents for your feedback. Car did pass the mot after the long journey and making it really hot... 

I will keep this in mind for the next year.