Passing emissions in Washington state
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Passing emissions in Washington state
I recently failed an emission test in WA state, and was seeing if anybody knew how to bypass the test w/o swapping out the whole exhaust system. I'm currently running aftermarket headers with a carsound cat, and fujitusbo catback. The Fault Code is P0420 Catalyst System Efficiency Below Threshold Bank 1. If anybody has any information that would be greatly appreciated. I would prefer avoiding the hassle of swapping my stock exhaust back in. Thanks so much!
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