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Re: Cel - P0421 Bank 1 Cat Efficiency Below Limit
i have seen this problem and the person put an o2 in it like the tsb said but it ended up being the precat was coming apart i replaced the pre cat and fixed the promblem(the dead giveaway was the new o2 sensor that i unsrewed was speckled with peices of whiite stuff ...(pieces of the cat) but it could have been a combination of the two that fixed the problem.
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