# 1 oxygen sensor location upstream

Tiny
JOHN PIERCE
  • MEMBER
  • 2006 CHEVROLET UPLANDER
  • 119,000 MILES
Looked on #1cyclendar side and can not find sensor on 3.5 engine where is it? I found # 2 behind cat conv.
Saturday, March 24th, 2012 AT 11:59 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Heated Oxygen Sensor (HO2S) 1 (3.5L)In right bank exhaust manifold, before catalytic converter.
Heated Oxygen Sensor (HO2S) 1 (3.9L)In right bank exhaust manifold, before catalytic converter.
Heated Oxygen Sensor (HO2S) 2 (3.5L)In exhaust, after catalytic converter.
Heated Oxygen Sensor (HO2S) 2 (3.9L)In exhaust, after catalytic converter.
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Sunday, March 25th, 2012 AT 12:03 AM

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