1997 civic ECU codes.
0420" means? it is on a OBD2 system.
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From: bumfunk athens, pa
Re: 1997 civic ECU codes. (someonehelpmenowplz)
P0420-Catalyst System Efficiency Below Threshold
most of the time that code comes on when your catilitic converter is starting to take a crap. but it could also the o2 sensor(s). I'd personally start with the cat.
most of the time that code comes on when your catilitic converter is starting to take a crap. but it could also the o2 sensor(s). I'd personally start with the cat.
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