Upstream sensor location

1999 FORD F-250
239,000 MILES • 6.8L • V10 • 4WD • AUTOMATIC
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DON CRISE
  • MEMBER
  • 1 POST
I can't find upstream sensor. Hayes manual says it's in intake manifold.
I looked and see only one sensor which is in a pipe that comes off intake manifold. I unscrewed it and the sensors don't look the same at all.
Could the sensor be elsewhere? Is it possible previous guy put wrong sensor on? Does it matter?
Thank you,
Don
May 20, 2019 at 4:20 AM
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STEVE W.
  • ✓ASE Certified Mechanic
  • 15,200 POSTS
  • ASE Certified Mechanic
Hello and welcome to 2CarPros. If you are referring to the upstream oxygen sensor they are located in the exhaust manifolds. One is on each side. The downstream sensor is located after the converter. What code do you gave that suggests it has a bad upstream O2 sensor?
May 20, 2019 at 8:49 AM
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