P0420 code now

[tacoboy]

97 Strat 2.0 148k Replaced O2 sensors almost a year ago because Bank 1 sensor (upstream) was bad. Now a CEL and P0420 scanned. I have read here that it could be another O2 problem but also could be the cat. I would like to know how many of you have run into this code and what ultimately was the fix. I would rather not spend another $50 a piece for O2 sensors if I don't have to. TIA

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[RooK]

It's a common code on a lot of cars. It's a catalyst inefficency code, so it's set when the reading between the upstream and downstream sensors don't differentiate enough... typically the sign of a bad cat.

[tacoboy]

Does anyone have any experience with replacing cats with aftermarket ones like this?









1997 DODGE STRATUS 2.0L 1996cc 122cid L4 MFI (C) [ECB] : Exhaust : Catalytic Converter


Item
Price
Core
Total










WALKER Part # 15037 {Universal}
After 11-26-96; Fed. & Calif. Emiss. Models. Not legal for use on OBDII vehicles licensed in the state of California

$58.79
$0.00
$58.79

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This is from the RockAuto.com website. If I can get a cheap cat and it'll last me a year or two, I'd rather do that as I will likely no longer have the car then. I just need something to get me through CT emissions testing.