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Re: Plymouth/voyager-1997 dtc420 probable cause
Most likely a bad cat converter. Small chance the O2 sensors are bad but have to confirm it with a scope. Smack the cat. If you hear internal rattling or it sounds like it's full of sand you definitely need a new one.
http://www.obd-codes.com/p0420
EDIT Have you tried resetting the light? Sometimes that's all that's needed for a while at least. Daughters Accord threw a 420 a few months ago. Reset it and it's still not back.
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07 Fusion / 06 RAV4 / 06 Accord / 96 Gr Caravan
Last edited by RIP; 01-13-2013 at 06:29 PM.
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