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P0155 1997 Ford F150 Code - O2 Heater Circuit Bank 2 Sensor 1

Quick Answer

The P0155 diagnostic trouble code (DTC) for a 1997 Ford F150 indicates an issue with the O2 sensor heater circuit in Bank 2 Sensor 1. Common causes include Faulty O2 Sensor: The O2 sensor itself may be faulty, causing the heater circuit to malfunction, Wiring Issues: Damaged or corroded wiring connecting the O2 sensor to the ECM can disrupt the heater circuit's operation, ECM Malfunction: A problem with the engine control module (ECM) can prevent it from properly controlling the O2 sensor heater circuit. 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 1997 Ford F150 indicates O2 Heater Circuit Bank 2 Sensor 1.
Common causes
Common causes include Faulty O2 Sensor: The O2 sensor itself may be faulty, causing the heater circuit to malfunction, Wiring Issues: Damaged or corroded wiring connecting the O2 sensor to the ECM can disrupt the heater circuit's operation, ECM Malfunction: A problem with the engine control module (ECM) can prevent it from properly controlling the O2 sensor heater circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P0155 1997 Ford F150 Description

The P0155 diagnostic trouble code (DTC) for a 1997 Ford F150 indicates an issue with the O2 sensor heater circuit in Bank 2 Sensor 1. This sensor is responsible for monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. The heater circuit in the O2 sensor is designed to reach operating temperature quickly, allowing it to function effectively even in cold conditions.

OBDII Code P0155 1997 Ford F150 - O2 Heater Circuit Bank 2 Sensor 1
P0155 1997 Ford F150 Code - O2 Heater Circuit Bank 2 Sensor 1

Common Causes of P0155 1997 Ford F150

  1. Faulty O2 Sensor: The O2 sensor itself may be faulty, causing the heater circuit to malfunction.
  2. Wiring Issues: Damaged or corroded wiring connecting the O2 sensor to the ECM can disrupt the heater circuit's operation.
  3. ECM Malfunction: A problem with the engine control module (ECM) can prevent it from properly controlling the O2 sensor heater circuit.
  4. Heater Circuit Damage: Physical damage to the heater circuit within the O2 sensor can cause it to malfunction.
  5. Exhaust Leak: An exhaust leak near the O2 sensor can affect its performance and trigger the P0155 code.

Symptoms of P0155 1997 Ford F150

  1. Check Engine Light: The most common symptom associated with the P0155 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Decreased Fuel Efficiency: A malfunctioning O2 sensor heater circuit can lead to inefficient fuel combustion, resulting in decreased fuel efficiency.
  3. Rough Idle: The engine may experience rough idling or hesitation when the O2 sensor heater circuit is not functioning properly.
  4. Failed Emissions Test: If the issue is not addressed, the vehicle may fail emissions tests due to increased emissions caused by the malfunctioning O2 sensor.

How to Fix P0155 1997 Ford F150

  1. Diagnose the Issue: Use a scan tool to retrieve the specific DTC, then inspect the O2 sensor, wiring, and ECM for any visible damage or issues.
  2. Replace O2 Sensor: If the O2 sensor is found to be faulty, replace Bank 2 Sensor 1 with a new, high-quality sensor.
  3. Repair Wiring: Repair or replace any damaged wiring connecting the O2 sensor to the ECM to ensure proper functionality.
  4. Check Exhaust System: Inspect the exhaust system for leaks that could be affecting the O2 sensor's performance.
  5. Clear DTCs: After completing the repair, clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0155 1997 Ford F150

The typical repair costs for addressing the P0155 code on a 1997 Ford F150 can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor in your area. This estimate includes the cost of a new O2 sensor, potential wiring repairs, and labor charges. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your location and vehicle specifics.

What does this mean?

Tech Notes for P0155 1997 Ford F150

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.

When is the Code Detected?

The current amperage in the front heated oxygen sensor heater circuit is out of the normal range. (An improper voltage drop signal is sent to ECM through the front heated oxygen sensor heater)

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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 1997 Ford F150 Code

1. What does OBDII code P0155 mean for a 1997 Ford F150?

The OBDII code P0155 on a 1997 Ford F150 indicates an issue with the O2 sensor heater circuit for Bank 2 Sensor 1.

2. What are the common symptoms of OBDII code P0155 on a 1997 Ford F150?

Common symptoms of P0155 may include poor fuel economy, rough idle, engine hesitation, and an illuminated check engine light.

3. What are the possible causes of OBDII code P0155 on a 1997 Ford F150?

Potential causes of P0155 include a faulty O2 sensor, damaged wiring or connectors, a blown fuse, or a problem with the vehicle's PCM.

4. How can I diagnose the O2 heater circuit Bank 2 Sensor 1 issue on my 1997 Ford F150?

To diagnose P0155, you can use a multimeter to test the O2 sensor heater circuit resistance, check the wiring for damage, and inspect the fuse related to the O2 sensor heater.

5. How can I repair OBDII code P0155 on my 1997 Ford F150?

Repair options for P0155 include replacing the Bank 2 Sensor 1 O2 sensor, repairing damaged wiring or connectors, and ensuring the fuse for the O2 sensor heater is in working condition.

6. Can driving with OBDII code P0155 on a 1997 Ford F150 cause further damage?

Continued driving with P0155 may lead to decreased fuel efficiency, potential damage to the catalytic converter, and poor engine performance over time.

7. How much does it typically cost to repair O2 Heater Circuit Bank 2 Sensor 1 on a 1997 Ford F150?

The cost to repair P0155 can vary depending on the specific issue, but replacing the O2 sensor or repairing wiring may cost anywhere from $100 to $300 or more.

8. Will resetting the check engine light resolve OBDII code P0155 on a 1997 Ford F150?

Resetting the check engine light may temporarily clear the code, but if the underlying issue causing P0155 is not addressed, the code is likely to return.

9. Can I drive my 1997 Ford F150 with OBDII code P0155?

While it is possible to drive with P0155, it is not recommended as it can lead to poor engine performance and potential long-term damage if left unresolved.

10. Is it necessary to use a professional mechanic to repair O2 Heater Circuit Bank 2 Sensor 1 on a 1997 Ford F150?

While it is possible to DIY the repair for P0155, seeking help from a professional mechanic is recommended for accurate diagnosis and proper repair to ensure the issue is resolved correctly.

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