O2 sensor wiring?

Tiny
BRIAN WILLIAMS2
  • MEMBER
  • 2010 FORD RANGER
  • 4.0L
  • 6 CYL
  • 4WD
  • MANUAL
  • 229,000 MILES
I have no voltage going to my o2 sensor bank 1 sensor 1.
Monday, September 8th, 2025 AT 11:45 PM

2 Replies

Tiny
AL514
  • MECHANIC
  • 5,533 POSTS
Hello, I assume you are referring to the heater circuit for the B1S1? Its the grey wire at the harness sensor plug.
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Tuesday, September 9th, 2025 AT 5:07 PM
Tiny
AL514
  • MECHANIC
  • 5,533 POSTS
This grey wire is the power feed for the oxygen sensor heaters, and the 2nd diagram shows where the power originates from, but you would be missing power for a bunch of other actuators as you can see if it was a fuse issue. So it sounds like there is a break in the Grey wire somewhere in between the sensor and the smart junction box behind the passenger side kick panel.
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Tuesday, September 9th, 2025 AT 5:17 PM

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