[bimmer49]

On the BiFuel I see there are 3 Lambda sensors. 2 normal ones and 1 specifically for the LPG system?
On MOT test, running on petrol, idle lambda and gas emissions were steady but at 3000rpm everything was fluctuating and this produced a fail.
I didnt get the chance to test on LPG.
I remember on the previous test the Inspector getting agitated with the readings BUT he passed the car, may even have over ridden the machine.
Now that was with a new front pipe and CAT fitted. The other I took off because it was rattling inside. I still have that pipe in my scrap pile.
I see there such things as 200cell CATs but they only seem to have 1 sensor point.
Any opinions please?
Gazzer