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Old 30 Nov 2009, 03:16 pm
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Join Date: May 2009
Posts: 3
Default 98 honda civic dx troubleshooting p0420 catalyst threshold.?

i changed the plugs distributor etc. to find out that i might need a new cat. my uncle had his cat removed same car but his is a 4door and there is no cel in his plus it passes inspections. can i do the same or is there another problem in my honda ? ASAP side notes when i noticed the problem car was lagging so i reved the shit out of it, Now the car runs but the muffler shakes like hell, i also have to rev a bit hard on frist gear or it will shut off.
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Old 30 Nov 2009, 03:46 pm
Join Date: Oct 2007
Posts: 81

Sounds like a plugged Cat. Which in turn will cause power loss yourself a favor and replace it before you damage parts that will cost you a lot more. good luck
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