O2 sensor 2001 GMC pickup

2001 GMC SIERRA
92,000 MILES • V8 • 2WD • AUTOMATIC
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MSG3
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I have a problem code P0420 bank 1 sensor 2 whitch O2 sensor do I need to replace??
Nov 14, 2010 at 7:47 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 1)In left exhaust pipe, before catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 2)In left exhaust pipe, after catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 2 Sensor 1)In right exhaust pipe, before catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 2 Sensor 2)In right exhaust pipe, after catalytic converter.
Nov 14, 2010 at 8:09 PM
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