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  1. 8 hours later...both cats replaced...

    Volkswagen Passat B5 Discussion
    Like others, I had code P0431 come up (see this post.) and the dealer replaced the coolant temp sensor. The CEL came back on a few days later so I took it back in. They ordered parts last week and we took it in on Friday morning. They ended up replacing BOTH catalytic converters and 3 O2...
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