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Discussion Starter · #1 ·
I have my 2006 Scion XB with 580,000mi and it started throwing P0420 & C1201. It used to be intermittent, but it's been on for over a week now. Gas mileage did drop to 26MPG from the normal 30MPG, but I'm not sure if that's because it's the "summer blend."

Any tips on where I should start? Never seen the C1201 before. Cat was replaced almost 2 years ago now.
Thanks!
 
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