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Discussion Starter · #1 ·
The dreaded P0431 is back on the 04 Santa Fe 3.5L. Absolutely no performance issues. I will change the downstream left bank O2 sensor but I'm doing my homework on aftermarket pre-cat.

A member recommended Bosal but I can't find the front pre-cat in that brand.

I find DAVICO and EASTERN CATALYTIC. Both claim "exact fit".
Has anyone used these and been happy with them?
I'm not keen on paying close to $800 (discounted price) for an OEM pre-cat.
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