Bank 1 Oxygen sensor two always zero
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Bank 1 Oxygen sensor two always zero
Hey all,
Have a 2001 F250 V10 and its been sputtering like crazy lately. Have trolled these forums looking for suggestions. Seems to be at its worst when the engine is warm and inbetween 1500-2000 rpm.
I have an ELM reader connected to a pc and the voltage output of Bank 1, O2 sensor two (drivers side) is always zero volts. I have swapped the O2 sensors and the drivers side still reads zero volts, the problem did not move. So it seems it would not be a sensor problem, wondering if this sensors data normally shows up thru OBD. Will check all the wiring in the mean time.
Have a 2001 F250 V10 and its been sputtering like crazy lately. Have trolled these forums looking for suggestions. Seems to be at its worst when the engine is warm and inbetween 1500-2000 rpm.
I have an ELM reader connected to a pc and the voltage output of Bank 1, O2 sensor two (drivers side) is always zero volts. I have swapped the O2 sensors and the drivers side still reads zero volts, the problem did not move. So it seems it would not be a sensor problem, wondering if this sensors data normally shows up thru OBD. Will check all the wiring in the mean time.
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Joined: Sep 2007
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From: S CAL
It would seem to me that if the O2 sensor was always at zero than the PCM would set a code for it. The software you have for your laptop may or may not read the data from the O2 sensor depending on what you have.
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Never thought it could be the reader. I have tried several different programs (Scantool.net, EasyOBDII, and OBD2007) all of them show zero volts for PID 15. So I could have a problem with the ELM compatible reader. Will see if I can get ahold of another one and compare readings.
The passenger side O2 sensor voltage was swinging from .1 volts to .9 volts but it wasnt what I would call a sine wave when graphing the data. More like a square wave, the sensor output would linger at the extreme before swinging back the other way.
I went ahead and changed out both O2 sensors. Drivers side still showing zero volts. Passenger side looks much better with sine wave output from .1 to .9 volts. Still running like crap tho. So I guess if the drivers side was really at 0 volts it would throw a code, must be my reader.
The passenger side O2 sensor voltage was swinging from .1 volts to .9 volts but it wasnt what I would call a sine wave when graphing the data. More like a square wave, the sensor output would linger at the extreme before swinging back the other way.
I went ahead and changed out both O2 sensors. Drivers side still showing zero volts. Passenger side looks much better with sine wave output from .1 to .9 volts. Still running like crap tho. So I guess if the drivers side was really at 0 volts it would throw a code, must be my reader.
Hotshot
Joined: Jan 2004
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From: St Louis
It's supposed to be a semi-irregular square wave. It's not supposed to be a sine wave.
There is nothing wrong with your scan tools. If your F250 is rated > 8500#, it doesn't even have downstream sensors so the PIDs are supposed to be ZERO. I suspect you are confused about what sensor 1 and sensor 2 actually are. Sensor 2 is the downstream sensor on four-sensor systems. You've been screwing with the upstreams....
Use your scan tool software to go look at the MISFIRECNT PIDs and see if any are elevated. Sounds like you have a simple low-grade misfire.
Steve
There is nothing wrong with your scan tools. If your F250 is rated > 8500#, it doesn't even have downstream sensors so the PIDs are supposed to be ZERO. I suspect you are confused about what sensor 1 and sensor 2 actually are. Sensor 2 is the downstream sensor on four-sensor systems. You've been screwing with the upstreams....
Use your scan tool software to go look at the MISFIRECNT PIDs and see if any are elevated. Sounds like you have a simple low-grade misfire.
Steve
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Yep, no downstream sensors on my '01 F250. And when I connect the scan tool the only supported O2 sensors are PID 14 & 15 (Bank 1 Sensors 1 & 2). Since my truck only has two sensors I assumed that these two PID's would show the output of those sensors.
Steve, are you saying that each bank is a pair of up and downstream sensors? That would make sense seeing that sensor two is always zero, and I have no downstream sensors. So is this typical for the OBD-I superduty's to only show one O2 sensor?
Steve, are you saying that each bank is a pair of up and downstream sensors? That would make sense seeing that sensor two is always zero, and I have no downstream sensors. So is this typical for the OBD-I superduty's to only show one O2 sensor?
Hotshot
Joined: Jan 2004
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From: St Louis
You should have a bank 1 sensor 1 and bank 2 sensor 1. If your software is showing anything else, it's faulty. Perhaps you may have misread or misreported what you've seen.
That is, only one upstream sensor per cylinder bank (side) is all your truck has. No downstreams (sensor #2).
Steve
That is, only one upstream sensor per cylinder bank (side) is all your truck has. No downstreams (sensor #2).
Steve
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From: Long Island USA
You should see both the driver's and passenger-side O2 sensors. They are both sensor 1, different banks.
I ran into this with my Autotap - it shows a third sensor, but no readings. I do not have a sensor after the cat. Different versions did different things, even showing four O2 sensors, but no readings on sensor 2.
More complete description of the OBD-I vs. OBD-II in the >8500 lbs class:
https://www.ford-trucks.com/forums/5...t-come-on.html
Wondering why your MIL doesn't come on?
Question is, why does your scanner only show one side?
I ran into this with my Autotap - it shows a third sensor, but no readings. I do not have a sensor after the cat. Different versions did different things, even showing four O2 sensors, but no readings on sensor 2.
More complete description of the OBD-I vs. OBD-II in the >8500 lbs class:
https://www.ford-trucks.com/forums/5...t-come-on.html
Wondering why your MIL doesn't come on?
Question is, why does your scanner only show one side?
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Tried DigiMoto software and both O2 sensors showed up. (Bank 1 & 2 Sensor 1). So the previously mentioned software doesnt like my scanner or my vehicle. Thanks for all the advice, am new to scantools.
For the rough running V10 I did all the things suggested on other posts. Cleaned MAF, replaced PCV, replaced fuel filter, checked fuel pressure, changed plugs and boots ( w/ antiseize and dielectric), changed O2 sensors. No EGR on my '01.
I looked up some inductive COP testers and wondered if my standard o-scope probe could pick up the coil voltage. And the answer is yes it can.
This is what my old scope showed while placing the probe next to or on top of the coil. Not sure what the first two spikes are, but it seems that the third is the spark with fuel in the cylinder. All of the cops looked like this except for COP #1. Occasionally the start of the spark (denoted by arrow) would spike off of the screen. I second guessed myself and took it to the dealer. Within an hour and $90 they told me that COP #1 was bad. So all in all it was a good learning experience. Hope this helps others in the future. Does anyone know what the first two spikes are?
For the rough running V10 I did all the things suggested on other posts. Cleaned MAF, replaced PCV, replaced fuel filter, checked fuel pressure, changed plugs and boots ( w/ antiseize and dielectric), changed O2 sensors. No EGR on my '01.
I looked up some inductive COP testers and wondered if my standard o-scope probe could pick up the coil voltage. And the answer is yes it can.
This is what my old scope showed while placing the probe next to or on top of the coil. Not sure what the first two spikes are, but it seems that the third is the spark with fuel in the cylinder. All of the cops looked like this except for COP #1. Occasionally the start of the spark (denoted by arrow) would spike off of the screen. I second guessed myself and took it to the dealer. Within an hour and $90 they told me that COP #1 was bad. So all in all it was a good learning experience. Hope this helps others in the future. Does anyone know what the first two spikes are?
chrism -- Had to add to your REP POINT total with this diagnosis. GREAT job...
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