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Getting P1511 HOSO2 running lean DTC

skeptikalone

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So I've replaced the MAF, all O2 sensors, TPS, EGR, and a few other minor parts in this little excursion to pass emissions. I made it 200 miles and did get my tags renewed but now I'm throwing the P1511. I cannot find any vacuum leaks or other obvious problems and I'm really hoping it isn't the PCM but how do I narrow it down to the issue causing the lean reading? Any help is appreciated, thanks all.
 


Vindictus

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Are you sure it's a vacuum issue?
P1511 Idle Switch (Electric Control Throttle) Circuit
 

skeptikalone

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Not at all, no idea what it is now. I thought the MAF, TPS, ERG, and the new O2's would clear it but didn't.
 

skeptikalone

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Are you sure it's a vacuum issue?
P1511 Idle Switch (Electric Control Throttle) Circuit
My code is saying P1511 Upstream HOSO2 running lean.
After replacing all of that though I'm still getting it.
 

DILLARD000

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Where is your TroubleCode p1511 definition from?
As Vindictus noted, my source says p1511 = Idle Switch (Electric Control Throttle) Circuit, not an OxSensor problem?
Brand of new OxSensors installed? Hopefully Bosch or FordMotorCraft, not notorious Asian knock offs.
 

skeptikalone

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First was advanced auto reading it then I picked up an autophix obdII reader and it also says heated oxygen sensor running lean.
 

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skeptikalone

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Where is your TroubleCode p1511 definition from?
As Vindictus noted, my source says p1511 = Idle Switch (Electric Control Throttle) Circuit, not an OxSensor problem?
Brand of new OxSensors installed? Hopefully Bosch or FordMotorCraft, not notorious Asian knock offs.
Oh and they were Bosch.
 

RonD

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So not P1511, which would never show up on our Rangers, its a "drive by wire" code I believe

P1151 Lack of Upstream Heated Oxygen Sensor Switch – Sensor Indicates Lean – Bank No. 2

Drivers side of a V6 engine, bank 2
Sensor 1, upstream, closest to engine on that side
Lean, so 0 volts showing no matter what computer does to adjust fuel mix, no "switching of voltage"

Yes, replace that O2 sensor, if no change then inspect the wires and connector for that sensor

O2 sensors generate their own voltage by chemical reaction with oxygen once heated above 600degF
Low voltage, 0.1 to 0.9volt, so under 1 volt
0.1v is lean
0.9v is rich
So any issue with its 2 wires for that sensor will result in 0 volts(lean), no switching

O2s have 4 wires, 2 are for a heater so they heat up faster and stay hot, 12v and ground
Other 2 are for the sensor itself

1998 4.0l Ranger should have a red/black and orange wire for O2 sensor on that side
Orange is a reference ground, used by most of the other sensors on engine, the grey/red wire on say the TPS, IAT or ECT
You can test for 0 ohms/continuity between the Orange wire on that O2 connector and any grey/red wire on another sensor, KEY OFF

The red/black wire on the sensor runs to the computer, pin 87
You can pull the computers 104 pin connector and do same continuity test
Pulling this connector and plugging it back in also cleans the pins/slots
Because the O2s have such low voltage ANY, even minimal, corrosion on one of their connectors causes 0 VOLTS/LEAN
 
Last edited:

skeptikalone

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Location
Indiana USA
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1998
Make / Model
Ranger XLT 4X4
Engine Type
4.0 V6
Transmission
Automatic
2WD / 4WD
4WD
Tire Size
265 75R16
So not P1511, which would never show up on our Rangers, its a "drive by wire" code I believe

P1151 Lack of Upstream Heated Oxygen Sensor Switch – Sensor Indicates Lean – Bank No. 2

Drivers side of a V6 engine, bank 2
Sensor 1, upstream, closest to engine on that side
Lean, so 0 volts showing no matter what computer does to adjust fuel mix, no "switching of voltage"

Yes, replace that O2 sensor, if no change then inspect the wires and connector for that sensor

O2 sensors generate their own voltage by chemical reaction with oxygen once heated above 600degF
Low voltage, 0.1 to 0.9volt, so under 1 volt
0.1v is lean
0.9v is rich
So any issue with its 2 wires for that sensor will result in 0 volts(lean), no switching

O2s have 4 wires, 2 are for a heater so they heat up faster and stay hot, 12v and ground
Other 2 are for the sensor itself

1998 4.0l Ranger should have a red/black and orange wire for O2 sensor on that side
Orange is a reference ground, used by most of the other sensors on engine, the grey/red wire on say the TPS, IAT or ECT
You can test for 0 ohms/continuity between the Orange wire on that O2 connector and any grey/red wire on another sensor, KEY OFF

The red/black wire on the sensor runs to the computer, pin 87
You can pull the computers 104 pin connector and do same continuity test
Pulling this connector and plugging it back in also cleans the pins/slots
Because the O2s have such low voltage ANY, even minimal, corrosion on one of their connectors causes 0 VOLTS/LEAN
Wow, all this great information, I thank you greatly. I will see what comes up after testing them. I still think this could be something simple like corrosion or a short and not the PCM 🤞🤞. I shall see soon.
 

RonD

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Yes, it would be an unusually PCM failure
 

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