Hi all,

I have had my cars yearly MOT test and the emmisions test is failing badly!

The CO is reading at 3% - the maximum it should read is 0.3%!

First thing I will check is the lambda, but I also want to check the water temp sensor.

Do you have any tips on how to do these, A member on alfa155.org told me to measure the lambda in ohms, and if it is above 4 ohms then replace it

but I have also read that I can measure the voltage of it when at 2000rpm, I will try this tonight.

Does anyone know the resistance of the water temp sensor when working?

Also, does a series 1 Q4 have a CO adjuster in the engine bay, anyone have a pic of it?

Thanks for your help,

Jack