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Oxygen sensors?

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
O/2 sensors will slowly lose sensitivity from contamination. If yours are original, they are overdue for routine change. They won't set a code until they get extremely bad and don't respond when the are expected to. If your complaint is just about a couple MPG, changing the sensors would be a good idea. You've got 154K on that truck. I remember when that was the entire life of the truck. Now it's just when you start doing some maintenance.
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Thursday, September 10th, 2020 AT 6:14 PM (Merged)
Tiny
MATT717
  • MEMBER
  • 2 POSTS
  • 2001 FORD F-150
  • 6 CYL
  • 2WD
  • MANUAL
  • 82,000 MILES
Looking to find the locatoin of the o2 cencor. Ive changed the fuel filter an the plugs an wires an stil get the service engine soon light.
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Thursday, September 10th, 2020 AT 6:14 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
What is code? If you have not read code go to Auto Zone or similar then post.
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Thursday, September 10th, 2020 AT 6:14 PM (Merged)
Tiny
MATT717
  • MEMBER
  • 2 POSTS
The code says its running lean on left an right banks
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Thursday, September 10th, 2020 AT 6:14 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Do you remember code in P0xxx format?
Possible faults:
EGR operation ie. Leaking
Vacuum leak
Exhaust leak before cat.
Low fuel pump pressure
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Thursday, September 10th, 2020 AT 6:14 PM (Merged)
Tiny
GEZER1
  • MEMBER
  • 1 POST
  • 2000 FORD F-150
  • 6 CYL
  • 2WD
  • MANUAL
  • 116,789 MILES
"check engine soon" warning appeared so I took the truck to my repair shop and they said one of the sensors needed to be replaced but all three should be replaced at the same time. All three were replaced and before I had gotten home, the light came on again. The shop told me there was a 50 key start reset?
If it was reading a bad sensor, wouldn't a new sensor prevent the warning from appearing again. Are there actually three and why would it require 50 starts to reset?
Thanks.
Mike Johnson
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Thursday, September 10th, 2020 AT 6:15 PM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
DTC P0135, P0141, P0155 Or P0161: HO2S Heater Circuit

DTCs received separately indicate a short to ground or open circuit in HO2S heater circuit. DTCs received in pairs, such as P0135 and P0155 or P0141 and P0161, indicate HO2S heater circuit is shorted to a power source of more than 2 volts. HO2S DTC identification is as follows:
DTC P0141 Is For HO2S-12
DTC P0155 Is For HO2S-21
DTC P0161 Is For HO2S-22
Refer to illustrations for HO2S identification.

Possible causes are:
Signal Shorted In Wiring Harness

Cut Or Pulled Wires
Open In GND Or VPWR Circuit
Corroded Terminals
Faulty HO2S Heater
Inspect HO2S connectors for loose, damaged or corroded terminals ,Water In Connectors


https://www.2carpros.com/forum/automotive_pictures/99387_dodge_6.jpg

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Thursday, September 10th, 2020 AT 6:15 PM (Merged)
Tiny
CAHARLEYHONEY
  • MEMBER
  • 1 POST
  • 2000 FORD F-150
Engine Performance problem
2000 Ford F150 V8 Four Wheel Drive Automatic

Can you please tell me where the oxygen sensor is located on this vehicle, Thanks
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Thursday, September 10th, 2020 AT 6:15 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
There a several oxygen sensors on your vehicle.
Sensor one bank 1 is the first sensor before the convertor on the side of the engine with the #1 cylinder. That is the passanger side.

Sensor one bank 2 is on driver side.

Sensor 2 is after the convertor
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Thursday, September 10th, 2020 AT 6:15 PM (Merged)
Tiny
MATIAS150
  • MEMBER
  • 3 POSTS
  • 2000 FORD F-150
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 310,000 MILES
When the engine is cold will start but when warm the starter will not do any thing, the computer find the engine runing at 55 mph and 208 degres when ideling in park position, and finds oxigen sensor of bank 1 # 02
to be defective.
If I throw wather with a howse to the oxigen sensors on the catalitic converter and coole it off, will start imediately.
Does the oxigen sensors by been hot or damage prevent 12V from going to the starter?
This engine has 310,000 miles and never change any sensor.
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Thursday, September 10th, 2020 AT 6:15 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,217 POSTS
No, it doesn't stop power to the starter. Are you getting the starter wet?
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Thursday, September 10th, 2020 AT 6:15 PM (Merged)
Tiny
MATIAS150
  • MEMBER
  • 3 POSTS
Yes, I wet every thing from the top of engine and nothing hapen but wen I wet from under the frame all exost pipes and catalitic converter, probably starter too, estart imediately, starter seems to work perfect wen works
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Thursday, September 10th, 2020 AT 6:15 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,217 POSTS
What I was thinking was the starter was getting hot from the engine and not working. What you have described, with the O2 sensor, doesn't make sense. However, if cooling it off does the trick and you have a code for it being bad, it's worth replacing.
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Thursday, September 10th, 2020 AT 6:15 PM (Merged)
Tiny
OTTOGIRL
  • MEMBER
  • 1 POST
  • 2000 FORD F-150
Engine Performance problem
2000 Ford F150 V8 Four Wheel Drive Automatic 71K miles

Where is the oxygen sensor on ford f-150 engine?
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Thursday, September 10th, 2020 AT 6:15 PM (Merged)
Tiny
STANGRACING306
  • MEMBER
  • 2 POSTS
There are four total if I'm not mistaking. There is one on each side of the exaust manifolds easy to see under the hood right before the firewall. And two more under the truck on the exaust before the converter.
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Thursday, September 10th, 2020 AT 6:15 PM (Merged)
Tiny
JACKNUT
  • MEMBER
  • 65 POSTS
  • 2000 FORD F-150
  • 4.2L
  • V6
  • 2WD
  • MANUAL
  • 162,000 MILES
Too lean bank 2 sensor 1. That code went away. Congress back off and on. But I get another code I forget the code number but it says bank 2 sensor 1. 02 sensor responding to slow. Change sensor?
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Thursday, September 10th, 2020 AT 6:15 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi Jack,

See the attached for the detail about o2 sensors. Sensor 1 bank 2 is the upstream sensor on the passenger side.

Usually the slow to respond codes are the sensors. However, there are some tests that can be run in order to confirm this. If it were me I would just go ahead and replace it because they are cheap enough to "play the odds" that this will resolve the issue.

Let me know what happens after you replace the upstream sensor on the passenger side and we can go from there. Thanks
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Thursday, September 10th, 2020 AT 6:15 PM (Merged)

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