Help with check engine code.....OBDII - P0420/ MIL 67
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Joined: Sep 2002
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From: Madisonville, KY, USA
Help with check engine code.....OBDII - P0420/ MIL 67
OK when you use the jumper wire to check the codes with the check engine light it reads 67. Which is OBDII P0420, and that reads (Catalyst System Efficiency Below Threshold) What the hell does that mean, and how can i fix it.
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