AutoCodes - OBDII Code List - P0151 1999 FORD F150

P0151 1999 FORD F150 - O2 Sensor Circuit Low Voltage Bank 2 Sensor 1

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3    What is this?
Table of contents

P0151 1999 FORD F150 Possible Causes

  • Faulty Front Heated Oxygen Sensor Bank 2
  • Front Heated Oxygen Sensor Bank 2 harness is open or shorted
  • Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection
  • Inappropriate fuel pressure
  • Faulty fuel injectors
  • Intake air leaks may be faulty
  • Exhaust gas leaks

How do I fix code P0151 1999 FORD F150?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
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Tech Notes

Replacing the Front Heated Oxygen Sensor Bank 2 usually takes care of the problem.
The HO2S sensor is monitored for a negative voltage known as characteristic shift downward (CSD). If the sensor is thought to be switching from 0 volts to -1 volts during testing, the PCM will use this input and remain in fuel control.

Cost of diagnosing the P0151 1999 FORD F150 code

Labor: 1.0

The cost of diagnosing the P0151 1999 FORD F150 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

When is the code detected?

The voltage signal from the sensor is lower than the specified time.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • High Fuel Consumption
  • Excessive smoke from Exhaust

P0151 1999 FORD F150 Description

The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.
OBDII Code P0151 1999 Ford F150 - O2 Sensor Circuit Low Voltage Bank 2 Sensor 1 - AutoCodes.com

More Information

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