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P0113, P0302, P0420 Trying to emissions-pass my new-to-me 2000 RS

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Hey guys. Just picked up a 2000 2.5RS and I'm trying to get it ready for emissions so I can register it. Any ideas on where I should start with these codes?

It's throwing P0113, P0420, and occasionally a P0302. I jiggled the wires on the distributor and the P0302 hasn't come back on, but the P0113 comes on RIGHT away so that's the main one I want to deal with.

I'm planning on replacing the MAP sensor first, and put a rear o2 sensor spacer in.

The car runs strong, but runs a little stronger when I clear the codes.

Relevant mods are:
Weapon R intake
6 puck clutch
Possible lightweight flywheel
Borla UEL header
Unknown catback
Viper alarm system
09 STI shortblock with forged internals and 8.1:1 compression.

Any ideas/inputs are appreciated. I did search btw, just hoping I'm on the right track. Trying to get this baby on the road!


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