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  1. Problems, Maintenance, and Repair (Gen 1)
    my grandpa's 2000-2001 toyota sienna has a blocked up cat. Just curious if I run a rod through it would that cause the post cat O2 sensor to think the engine is running too rich since the cat wouldn't be there to burn off the excess? We got a quote from a local shop for $1900 he claimed he had...
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