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98 GMC Savana is giving me P0420 and P0125

Tiny
LOVETOLAUGH86
  • MEMBER
  • 1998 GMC SAVANA
  • 200,000 MILES
98 GMC savana is giving me P0420 and P0125 is there one thing that can give both codes or are there different things wrongs with it. Given the year / model what are the most probable causes.

Thank You
Monday, April 9th, 2012 AT 6:27 AM

1 Reply

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
P0125 coolant temp to low for closed loop mode. P0420 catalyst efficiency below threshold. I would fix the first and see if the second goes away. Could be your thermostat or the temp sensor.
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Monday, April 9th, 2012 AT 6:49 AM

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