Code P0420

Tiny
BILL_THE_CAT
  • MEMBER
  • 2007 SATURN VUE HYBRID
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
Wondering if any Saturn techs still here that might have some ideas about a P0420 low catalytic converter efficiency.

Thanks.
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Tuesday, July 17th, 2018 AT 1:15 PM

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Tiny
ASEMASTER6371
  • EXPERT
Good evening.

The 420 is a code for the catatlytic converter. it needs to be replaced.

The precious metals inside are worn out and the downstream O2 sensor is reading the same as the upstream. The downstream O2 sensor should be a steady reading, not varying.

Roy

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter
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Tuesday, July 17th, 2018 AT 4:12 PM

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