O2 sensors location up flow and down flow sensors?
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
STEVE W.
MECHANIC
13,576 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.