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Think cats are clogged need opinions.
My 01 yukon 5.3 has 334,000 miles and P0430 and P0420 codes are both coming up but it doesn't feel like they are clogged. I've ran some techron and cataclean thru it about 10k miles ago but didn't help with codes. I'm afraid of dumping to much money into it with the miles that are on it but it's...- Bigshawn
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- Replies: 26
- Forum: Engine & Drivetrain
