I recently got P0420 as well, and it has recurred a couple of times now after clearing it. Dang it! mad I know if I take it to the dealer, they'll give me the runaround and try to sell me unnecessary services as if I haven't got a clue what's going on.

Could someone be so kind as to post the diagnostic info for this DTC from the service manual CD-ROM? I'd look it up myself, but my CD is currently 1000 miles away.

TIA--

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Garrick
Silver E0, #3895 of 6535, built 10/2/97
She's stock. Why mess with a good thing? laugh