My new pets
Posted: Mon Nov 13, 2023 9:21 pm
Say hello to my 4 new cats!
Jokes aside, I had these replaced due to one badly rattling cat which turned out to be a part of the oxygen sensor rattling inside one of them.
The rest was replaced due to catalytic converter codes such as:
Catalyst system bank 1&2 ,efficiency below threshold - 16814/16804
The whole operation took 4 new cats and 4 new lambda sensors + fitting accessories such as exhaust gaskets, bolts, exhaust paste and copper bolts came to £557. Labour was around 9 hours but that was done by a subject matter expert ( MikkiJayne) I'm sure it would have been much much longer if it was done by anyone else, and if any of the exhaust manifold studs broke it would have been an engine out job.
One of my nuts was seized, and it had to be cut off using a dremel with a flexible extension on it: I would not spend the time and money painting mine again with a high temperature paint as it burned off after less than 300 miles My replacement cats were from BM catalysts, there were quite a few burrs i had to clean up myself and welding spots, but they were 500-600% cheaper then original Audi parts: 1 hole in the rear part of the exhaust was fixed with one of those exhaust band-aids from halfords too:
So far I've done 500 miles since the cat replacement, the car is now quiet, there's no catalyst codes and it passed its MOT.
The rest was replaced due to catalytic converter codes such as:
Catalyst system bank 1&2 ,efficiency below threshold - 16814/16804
The whole operation took 4 new cats and 4 new lambda sensors + fitting accessories such as exhaust gaskets, bolts, exhaust paste and copper bolts came to £557. Labour was around 9 hours but that was done by a subject matter expert ( MikkiJayne) I'm sure it would have been much much longer if it was done by anyone else, and if any of the exhaust manifold studs broke it would have been an engine out job.
One of my nuts was seized, and it had to be cut off using a dremel with a flexible extension on it: I would not spend the time and money painting mine again with a high temperature paint as it burned off after less than 300 miles My replacement cats were from BM catalysts, there were quite a few burrs i had to clean up myself and welding spots, but they were 500-600% cheaper then original Audi parts: 1 hole in the rear part of the exhaust was fixed with one of those exhaust band-aids from halfords too:
So far I've done 500 miles since the cat replacement, the car is now quiet, there's no catalyst codes and it passed its MOT.
. From memory bolting up the nearside downpipe to the manifold was a nightmare, custom tool design was needed just for that one bolt and routing the sensor leads wasn't fun either, but then I didn't have a lift. 
