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All cats should have position 4/2 bungs (position 4 on 2000-2004, position 2 on 97-99).
As long as you have pre-cat sensors installed, the car will run fine, but you'll get a CEL for failing cats since the DME won't see a signal for the post cat sensors and will think they have failed.
You need the pre-cat sensors for fuel ratio.
I don't know if there are any post cat O2 emulators on the market.
Last edited by particlewave; 09-03-2018 at 04:33 PM.
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