Code P0420

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

Thanks.
Jul 17, 2018 at 1:15 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 POSTS
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
Jul 17, 2018 at 4:12 PM
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