Ecu Scanner help
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Honda-Tech Member
Joined: Jan 2003
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From: San Francisco, CA., USA
Ecu Scanner help
My nephews scanner was reading: P0420 Catalyst System Efficiency Below Threshold. Is that regarding the cat ? the ecu was also throwing a code 67. Thanks in advance
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Joined: Jun 2003
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From: Tacoma, WA, USA
Re: Ecu Scanner help (BeesDA6)
do you have any other codes for the powertrain? I looked it up and if there is other PO codes (DTC) with a PO137, PO138 or PO141 then you have a related short to the HO2S might want to check and see if you have a short from the lines to the HO2S and also check the HO2S. 
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civicracer94
Honda CRX / EF Civic (1988 - 1991)
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Dec 8, 2006 06:22 PM
