AutoCodes – Ford – P0155 1999 Ford F150

P0155 1999 Ford F150 Code - O2 Heater Circuit Bank 2 Sensor 1

Quick Answer

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0155 1999 Ford F150 indicates O2 Heater Circuit Bank 2 Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 4,926

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0155 1999 Ford F150 Description

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM). In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground. The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

OBDII Code P0155 1999 Ford F150 - O2 Heater Circuit Bank 2 Sensor 1 - AutoCodes.com — P0155 1999 Ford F150 Code - O2 Heater Circuit Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0155 1999 Ford F150?

Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1
Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse
Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground
Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0155 1999 Ford F150?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

During testing the HO2S Heaters are checked for opens/shorts and excessive current draw. The test fails when current draw exceeds a calibrated limit and/or an open or short is detected.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0155 1999 Ford F150 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0155 1999 Ford F150 Code

1. What does the OBDII code P0155 for a 1999 Ford F150 mean?

The OBDII code P0155 indicates an issue with the O2 Heater Circuit Bank 2 Sensor 1 in the vehicle's oxygen sensor system.

2. What are the common symptoms of a P0155 code in a 1999 Ford F150?

Common symptoms of a P0155 code include poor fuel economy, rough idling, engine misfires, and the illumination of the check engine light.

3. What are the possible causes of a P0155 code in a 1999 Ford F150?

Potential causes of a P0155 code include a faulty oxygen sensor, damaged wiring or connectors in the sensor circuit, or a blown fuse related to the sensor heater circuit.

4. How can I diagnose the O2 Heater Circuit Bank 2 Sensor 1 issue triggering the P0155 code in my 1999 Ford F150?

Diagnosing the P0155 code involves checking the oxygen sensor's wiring and connections for damage, testing the sensor's heater element for continuity, and inspecting related fuses for any signs of being blown.

5. Can I continue driving my 1999 Ford F150 with a P0155 code present?

It is not recommended to continue driving your vehicle with a P0155 code as it can lead to decreased fuel efficiency and potentially cause further damage to the vehicle's engine components.

6. How can I repair a P0155 code in my 1999 Ford F150?

To repair a P0155 code, you may need to replace the faulty oxygen sensor, repair any damaged wiring or connectors in the sensor circuit, or replace blown fuses related to the sensor heater circuit.

7. How much does it typically cost to fix a P0155 code in a 1999 Ford F150?

The cost of fixing a P0155 code can vary depending on the root cause of the issue, but it typically ranges from $100 to $300 for parts and labor.

8. Can a DIY enthusiast repair a P0155 code in a 1999 Ford F150?

If you have experience working on automotive electrical systems, you may be able to diagnose and repair a P0155 code yourself by following a repair manual or tutorial specific to your vehicle.

9. How often does the O2 Heater Circuit Bank 2 Sensor 1 fail in a 1999 Ford F150?

The O2 Heater Circuit Bank 2 Sensor 1 can fail due to various reasons, but it is not a common occurrence in a well-maintained 1999 Ford F150. Regular maintenance and timely repairs can help prevent such failures.

10. Is it necessary to reset the OBDII system after fixing a P0155 code in a 1999 Ford F150?

Yes, it is recommended to reset the OBDII system after fixing a P0155 code to clear the error code and ensure that the issue has been successfully resolved.