O2 sensor 2001 GMC Pickup

Tiny
MSG3
  • MEMBER
  • 2001 GMC SIERRA
  • V8
  • 2WD
  • AUTOMATIC
  • 92,000 MILES
I have a problem code P0420 bank 1 sensor 2 whitch O2 sensor do I need to replace?
Sunday, November 14th, 2010 AT 7:47 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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.
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Sunday, November 14th, 2010 AT 8:09 PM

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