catalytic converter trouble

2009 DODGE CARAVAN
118,500 MILES • 1.8L • 6 CYL • FWD • AUTOMATIC
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HERBERT MARTIN
  • MEMBER
  • 18 POSTS
I have codes P0420 and P0420 P/D. I replaced the converter about three months ago and its starting to cause the light to come on again. Where would I start to trouble shoot the problem? The old catalyst is not clogged up completely on any part of the catalytic converter or broken any where.
Jul 20, 2016 at 6:57 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
looking at the catalytic converter is really not a good way of seeing whether they are bad or not. check for air leaks /maybe a bad O2 sensor, or a O2 sensor that was replaced but is not really a good sensor.
Jul 21, 2016 at 6:01 AM
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