O2 sensors location up flow and down flow sensors?

Tiny
KEN WRIGHT2
  • MEMBER
  • 2004 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 148,658 MILES
Where are b1 up flow and down flow sensors located?
Saturday, January 21st, 2017 AT 9:33 AM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 13,476 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.
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Monday, June 28th, 2021 AT 8:02 PM

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