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P0340 catalytic converter issue

2.9K views 4 replies 3 participants last post by  Enola Gaia  
#1 ·
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Hey guys I have had this check engine light on for awhile now, last inspection time I just dumped a bottle of sea foam in and light cleared, passed inspection and as I pulled away it turned on. Well it’s time again, and it’s showing the right bank cat is bad which has always been the problem with this check engine code, and I just want to fix it and be done with it. I went to a shop and to get a new one plus labor it’s about 1100 bucks. I called pep boys and they said I should just find a cat and take it to a muffler shop and have them weld it in. Any one in here run into this issue? If so what did you do? I looked on eBayand they sell a pair that’s from the intake back with a new cat for around 250-275 and I’m sure the muffler shop would be around 30-40 bucks or so. That 1100 dollar quote was just to fix and replace the bank 2 cat. To fix each side it would then be double, as they always try and say well if you fix one you should fix both just incase. Idk if I can just buy the pair off eBay and get them welded in, and it would work then I’m game for that, and saving some cash.
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#2 ·
Not speaking for every shop out there but the ones I've work at don't install customer parts since they won't warranty the work/parts and it leads to a lot of headache reminding the customer they agreed to no warranty. That being said if the cat runs at a perfect 90 degrees we'll offer universal cats that we will weld in, expect closer to 100$ per hour labor and a markup on the cat as well to cover warranty and time finding the cat. You'll may run into the problem that your vehicle is California certified and requires a California certified cat, again that is up to the shop wether or not they want to take part in a federal offense. As far as quality on parts, you get what you pay for, I've been using a 100$ magnaflow cat on my truck for about a year and haven't had a problem with it, but the orignal was on there for 300k miles, there is a reason metal recyclers pay more for OEM cats than aftermarket.

Just as a side note, p0340 is not a cat code, either p0420 or p0421 would be, are you sure its the cat that has gone bad?
 
#3 ·
... Just as a side note, p0340 is not a cat code, either p0420 or p0421 would be, are you sure its the cat that has gone bad?
Right ... P0340 shouldn't be a cat problem. I can't say anything more specific because kawiman hasn't bothered to give us the specifics on his Taco (year; model; engine; tranny ...).
 
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