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1998 Chevy Truck catalytic converters

Tiny
DTORRES
  • MEMBER
  • 1998 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 165,000 MILES
Engin light on OBDII code PO420
THE OXYGEN SENSORS MONITOR THE CATALYTIC
CONVERTERS ABILITY TO STORE OXYGEN. IS THERE AN ADDATIVE TO RESTORE THE CATAILTIC CONVERTER
Thursday, January 3rd, 2008 AT 4:05 PM

2 Replies

Tiny
ZUE
  • MEMBER
  • 76 POSTS
This may be due to an engine tune up issue and the O2 is just the symptom and not the cause. Do a general check-up on the engine before assuming the Cat is bad.
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Thursday, January 3rd, 2008 AT 4:18 PM
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
What you have is an o2 sensor before and one after the converter
and when reading of those sensors is close to each other
that is indication that the converter not doing its job burning the access fuel left unburned
and you have to replace the converter
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Thursday, January 3rd, 2008 AT 4:31 PM

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