After replacing coolant code P0420 appeared and will not start

Tiny
APARTON2018
  • MEMBER
  • 2002 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 207,000 MILES
Replaced the coolant and now vehicle will not start but cranks. Error code p0420 is read. Replaced both battery and alternator, belts and A/C. Pump a week ago.
Wednesday, June 20th, 2018 AT 9:17 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening.

Why did you change the coolant?

420 is a code for a bad catalytic converter. The precious metals inside are worn out. It needs to be replaced.

Did you check for spark?

Roy

https://www.2carpros.com/articles/car-cranks-but-wont-start

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

https://www.2carpros.com/articles/how-to-test-an-ignition-system
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Wednesday, June 20th, 2018 AT 6:15 PM

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