Because I don't think this car passed its emissions.
Following on from the earlier thread "Local garage breaks our cat during an MOT. Why always us?" We've had a new cat fitted by them and its been given an MOT pass. We paid for the MOT, as seemed reasonable, and took the car back.
It was hissing. Hmmm, a leak. Took it back, mechanic agreed it was leaking, took off the cat, resealed it and gave it back. Its only 100 yards to our house from Frosts, so I didn't notice a problem.
Jan takes it out to go into town this morning and its still hissing. A bit of investigation by myself shows a rubber pipe seperated. OK, maybe he missed it in reassembly. Put it back on, and drive down the road and it pops off again.
The pipe (for those that care) is the one from the centre of the exhaust manifold to the 'exhaust gas pressure differential sensor'. It takes a small amount of exhaust gas to the pressure sensor as a part of the emissions system. A year and a half ago this pipe started popping off and it turned out to be the original, eight year old cat breaking down inside and blocking the exhaust, therefore increasing the pressure upwind of it. A new cat, (that Frosts broke just a year and a bit into its life), cured it.
So, If I now have a NEW cat, and the emissions pipe is blowing off, what have they done? Why is the pressure built up to blow off the pipe still? Can it have passed the emissions test as it is? Should we have an emissions certificate? What are the winning lottery numbers for fridays euromillions? All these questions and more...
VOSA might be interested.
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