P0420 patch
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Joined: Jan 2009
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From: denver
P0420 patch
So I installed the P0420 patch on my Evo 9 oem ecu and I was curious whether having this patch installed would cause the o2 sensor readiness monitor to show incomplete or N/A or prevent the readiness monitor from going into ready status?
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Joined: Dec 2015
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From: HWY 9