o2 senser swap
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Joined: Oct 2008
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o2 senser swap
i have 95 f-250 5.8 liter 4x4 i need to replace the o2 senser i have bin full of new ones from ford form early 90's thunderbird i think, but it has the same wires and plugs right in it should work in my truck right?
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
How many wires on the old sensors? If it matches what your truick has it's the exact same sensor. Later trucks used a 4-wire sensor with 2 for the heater circuit and 2 for the sensor, (sig and gnd). 3-wire sensors will also work in the 4-wire truck harness as well, just make sure the signal wires are on the right pins.
Lead Driver
Joined: Nov 2002
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From: Concord, NC
3-wire sensors will also work in the 4-wire truck harness as well, just make sure the signal wires are on the right pins.
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
I have had both in my truck.. which worked fine, and I have run it with a single wire from the wideband to the sensor input on the O2 connector.. which also worked perfectly. In that case the wideband system had a seperate chassis ground so there was still a reference.
Lead Driver
Joined: Nov 2002
Posts: 9,558
Likes: 45
From: Concord, NC
Yes, but with a high and low signal expected at the engine computer, I'm not sure how that worked. Did you have any way to monitor the O2 sensor signal in the engine computer itself?
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FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Yes, with the tuner I can see the o2 sensor input to the computer realtime as well as the wideband sensor output, and as expected around 14.7:1 the narrowband sensor signal begins switching high and low. Sig Rtn on the O2 harness is ground so it doesn't matter where this reference is made as long as there is one. On the 3-wire sensors the heater circuit and signal share the same ground wire, that's the only difference and is the reason it works.
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