Del Sol (1992 - 2000) - Code P0420 : Mechanic says: - 1998 civic lx 104000 miles 4dr, automatic Last week my check engine light went on Buy an aftermarket header for a 96-00 Civic EX, then buy a convertor for a 96-00 Civic EX, and then have a muffler shop make the necessary cutting
Dec 21, 2016
It was indeed the catalytic converter (the EX does not have a pre-cat). After replacing it, the downstream sensor graph spends most of its time above 0.5 V, as it should if the converter is working. Update: I started getting this error code again, a little over a year after replacing the cat. I also finally found a
Mar 25, 2008 While driving my 1998 Honda Accord, I noticed that the check engine light came on so I took it to the auto parts store to have the code read for free. They said I had a P0420 If you have spent anytime on forums asking questions the first response you get is always “get the manual." This is good advice.
Jul 12, 2015 P0420 Honda. Honda has issued a service bulletin to address a Honda code P0420 Catalyst system efficiency below threshold on 1996-00 Honda Civic DX, LX, EX vehicles. The bulletin also addresses Honda cod P0301 Number 1 cylinder misfire detected, Honda code P0302 Number 2 cylinder misfire
Feb 19, 2005 This is a really common problem, those CATS were born to die. If the engine has had plugs replaced and there are no other codes, I'd bet the cat has gone 'south'. You could check the O2 sensor readings to verify, if you have a good scan tool. hondadude is offline
1998 Honda Civic 4 cyl Front Wheel Drive Automatic 170000 miles I recently replaced the radiator, hoses, thermostat, plugs, and wires

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March 2018