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01-25-2018, 10:41 PM
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Join Date: Apr 2017
Drives: 2016 FRS
Location: Lawrenceville GA
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P0420 Code
about a month and a half after installing catted UEL Headers i got the P0420 code. I know that means either the o2 sensor or the catalytic converter but the thing is ever since the check engine light came on 2 days ago the down shifts make no noise what so ever and they used to be VERY loud. Any idea as to why that is?
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