O2 sensors location up flow and down flow sensors?

2004 CHEVROLET TRAILBLAZER
148,658 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC
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KEN WRIGHT2
  • MEMBER
  • 1 POST
Where are b1 up flow and down flow sensors located?
Jan 21, 2017 at 9:33 AM
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STEVE W.
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 15,146 POSTS
Only has two O2 sensors. One is on the exhaust manifold near the passenger side rear of the engine on the curved area. The other is in the exhaust system behind the converter.
Jun 28, 2021 at 8:02 PM
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