Hello,

So my Legacy is starting to pull a 0420 code, due to the previous owner doing improper repairs or lack of work, thus causing damage to the cat.

Has anyone ever seen this modeled installed or any feedback good or bad.

 

https://www.magnaflow.com/products?partNumber=52305

There's a little known warranty part number for '06+ cars..... SOA635112

 

You just have to find a dealer that will order it. Or ebay/Amazon it. Technically I think they are supposed to provide a VIN to SOA.... my dealer has sold them to me no questions asked though. 

 

https://www.subarupartsforyou.com/oem-parts/subaru-campaign-wqd40-front-pipe-with-primary-catalytic-converter-vin-required-soa635112

 

Hilarious anecdote - Subaru calls this the "Pretzel Type" manifold/converter. LOL

 

GD

Edited December 2, 20178 yr by GeneralDisorder

If you end up needing one.  I have an 07 Legacy Outback CAT.  The engine had 42K on it.  $200 = Shipping from 80919

Make sure you solve whatever the PO did before swapping in a new one, or it'll happen again. Random misfires that are ignored too long often destroy cats for example, as do rodents chewing through sensor looms, ignition coil looms, O2 sensors looms, etc.

Throwing catalytic converters at a P0420 is an expensive guess.  I would diagnose further...and then ignore the check engine light, but we don't have emissions here so it doesn't matter.  

My Lincoln had rodent chew on the COP harness for one side of the engine, and it was run (enough) before I bought it, like that. After the harness repair and replacing 2 failing COPS later, I noticed raw exhaust fumes at warm idle. I originally suspected a cat problem earlier on, but noticed the 3rd cat was removed, and attributed it to that, seeing as no CEL was coming on. Now a P0420 appears on occasion during light cruising. Kicked the mufflers and it sounds like a rattle can (substrate most likely in muffler). Also, engine is down on power if you try and step on it.

 

w/o pulling the exhaust, those are *some* things that can trigger a P0420. A vacuum test is helpful assuming obstruction. A visual of the cat substrate (both sides) will tell you if if it's deformed or broken.