dances-with-pies
Member
Having finally solved the FSI's reluctance to rev when warm (FSI slow to rev) with a new N80 valve, it was time to MOT it.
It had passed previously when running poorly so I wasn't expecting any issues with emissions.
Here is the result.
The garage suggested that the low lambda reading was most likely due to a failing lambda sensor so I ordered a Bosch one from EuroCarParts along with a can of Cataclean.
When I came to fit it I realised that I had replaced it the previous year only 116 miles earlier!
I fitted the new one anyway and emptied the can of Cataclean into the tank which was just over a quarter full of one year old Shell V-Power.
Warming the car up before before taking it for a re-test, I went on a fifteen mile thrash to give the Cataclean time to do its stuff.
The car was brilliant fun and plenty hot enough when I arrived.
It was hooked straight up and tested with the following result.
The results are pretty much the same.
The MOT tester was surprised and questioned the make of lambda sensor.
I confirmed that it was a Bosch sensor and that it replaced another Bosch sensor that was only 116 miles old.
The next suggestion was the air flow meter but that was replaced with a genuine dealer part less than a thousand miles previously.
He then asked if it had been remapped because he had seen similar issues on other VAG cars after a remap.
It is fitted with a ProBoost ECU but other A2OC members have passed emission tests so I don't think that's the issue.
What else could cause these readings?
It had passed previously when running poorly so I wasn't expecting any issues with emissions.
Here is the result.
The garage suggested that the low lambda reading was most likely due to a failing lambda sensor so I ordered a Bosch one from EuroCarParts along with a can of Cataclean.
When I came to fit it I realised that I had replaced it the previous year only 116 miles earlier!
I fitted the new one anyway and emptied the can of Cataclean into the tank which was just over a quarter full of one year old Shell V-Power.
Warming the car up before before taking it for a re-test, I went on a fifteen mile thrash to give the Cataclean time to do its stuff.
The car was brilliant fun and plenty hot enough when I arrived.
It was hooked straight up and tested with the following result.
The results are pretty much the same.
The MOT tester was surprised and questioned the make of lambda sensor.
I confirmed that it was a Bosch sensor and that it replaced another Bosch sensor that was only 116 miles old.
The next suggestion was the air flow meter but that was replaced with a genuine dealer part less than a thousand miles previously.
He then asked if it had been remapped because he had seen similar issues on other VAG cars after a remap.
It is fitted with a ProBoost ECU but other A2OC members have passed emission tests so I don't think that's the issue.
What else could cause these readings?