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The P0422 code, is a very common issue; the cats do eventually go bad and here the code definition.


Having said that, I would confirm; that the shops diagnosis is correct. This video, is a easy and good way; to confirm, the cat is bad and needs replacement (using a scan tool, infrared temp gun, etc).

 

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If the diagnosis is confirmed and you do need a new cat, then you might check out a VW oem company Bosal. Around here, many have been in the same situation as you; the benefit of the Bosal cats, is they are oem quality, fit correctly and every one, has passed the emissions testing, that people have failed, the check engine light/trouble code, was resolved. Bosal cats are in the medium price range but they fit correctly; so, no needed additional welding or modifications, to make them fit. Because of this, you could install it yourself; save money on labor, if total cost is a primary concern. You can look up your car on the online Bosal catalog and find the right one for your application; do not worry about the msrp pricing listed on the site/catalog, as you will find the prices online much cheaper (check RockAuto, carparts.com, carid.com or Amazon, (google search the part #); other local auto parts stores, possibly Autozone, may carry the Bosal brand as well).


When, replacing the exhaust parts; I would also, check out all the mounts, rubber hangers and anything else, that is worn out, that can cause the flex area to get damaged, replace anything that is needed.
 
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