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Q: Is this alternative to replacing catalytic converters sound? on 2006 Toyota Highlander

Engine light on, instead of replacing catly. conver. can you do feul injection serv, engine decarb, chem in tank and adaptors for both rea O2s?
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This may help. Most of the time the convertor will end up needing replacement. After replacement make sure you test to see if something caused it to go bad. Running rich, coolant leak into exhaust, burning oil. Unfortunately convertors are common on these Toyotas
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