2002 Dodge Neon code 420

2002 DODGE NEON
160,000 MILES • 4 CYL • FWD • AUTOMATIC
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TFC35
  • MEMBER
  • 7 POSTS
Check engine light on showing code PO 420. catalyst 1/1 effi failure. What do I need to check first? site is saying oxygen sensor, catalytic converter. Not sure where to start.
Jun 28, 2008 at 10:46 AM
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MERLIN2021
  • CAR REPAIR CONTRIBUTOR
  • 17,250 POSTS
Check for any dents or holes in the converter, check for any exhaust leaks, If the 02 sensors have not been replaced yet, it's past time, do both...if problem persists, after 02 replacement, you will have to replace the converter too!
Jun 28, 2008 at 10:53 AM
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