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I JUST had this code. at first, I cleared it myself, but it came back after 180 miles. I JUST finished installing a replacement oem header (with only 10k miles) that I bought off someone used for cheap who went catless tomei UEL.
The CEL went away right when I started the car up with the new header. Used my scan tool, code is still stored, but light is off. I can manually clear the code, but I want the PCM to make it go away on it's own.
I have 123k miles on my '13.
To my surprised, the previous owner of my car had a stock header on there without all the heatshields on it. He also didn't use original hardware and it seems like he had to weld a stud back on.... and worst of it all, he double gasketed the header to overpipe connection... I'm not sure if that was the curlpit, or the actual cat (the honeycomb looked fine inside), but I'm glad I atleast replaced that junk with a fresh oem header and new OEM subaru gaskets.
I gotta say, reinstalling a stock header is a bitch because of the studs that connect it to the overpipe. With aftermarket it's easier because there are no studs... had to drop the front pipe and disconnect the overpipe to do it.
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