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#1
01-11-2013, 10:36 PM
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Plymouth/voyager-1997 dtc420 probable cause
1997 plymouth/voyager dtc code420 catalyst efficiency below threshold bank 1 repairs done-tune-up and all vacuum hoses checked or replaced. Any ideas code still coming up. Hadley3119
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HADLEY3119 
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#2
01-12-2013, 03:52 AM
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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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**We took the time to answer your post. Please give us some time and post the fix. It will help hundreds. **Follow prescribed safety practices before attempting any procedures. Doubts? Consult a maintenance manual. 07 Fusion / 06 RAV4 / 06 Accord / 96 Gr Caravan Last edited by RIP; 01-13-2013 at 06:29 PM.
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