2001 Cadillac Deville Code P420

2001 CADILLAC DEVILLE
73,000 MILES
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KBWALKER
  • MEMBER
  • 3 POSTS
Hoping I don't have to have a new cat converter. Does anyone know about this code (P420) and is there an easy fix? I just had my secondary air pump replaced because my SES light came on and the code read P410. Car runs fine now I'm getting a code of P420. I love the Caddy but now I'm shaking my head!!
Aug 12, 2013 at 3:10 AM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
p420 could be a converter but it cold be a bad O2 sensor or an air leak as well have it checked by apro. if the converter is bad check with the dealer because they should be warrantied for 80k
Aug 12, 2013 at 5:29 AM
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