AutoCodes – Pontiac – P0155 Pontiac

P0155 Pontiac Code - HO2S Heater Performance Bank 2 Sensor 1

Quick Answer

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor Bank 2 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 2 Sensor 1 circuit poor electrical connection. 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 Pontiac indicates HO2S Heater Performance Bank 2 Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor Bank 2 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 2 Sensor 1 circuit poor electrical connection.
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 4,545

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 Mar 23, 2024

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

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach an operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensors to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, the ground is provided to the heater by the HO2S heater low control circuit through a low side driver within the Engine Control Module (ECM). The ECM uses Pulse Width Modulation (PWM) to control the HO2S heater operation to maintain a specific HO2S operating temperature range.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the HO2S 1 heater current is out of factory specifications.

OBDII Code P0155 Pontiac - HO2S Heater Performance Bank 2 Sensor 1 - AutoCodes.com — P0155 Pontiac Code - HO2S Heater Performance Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0155 Pontiac?

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

How to Fix the DTC P0155 Pontiac?

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

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it takes the sensor to warm up and start sending an adequate signal. The code is set when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can cause the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the fuse and connector are OK, replacing the O2 Sensor usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0155 Pontiac 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 Pontiac Code

1. What does OBDII code P0155 for a Pontiac mean?

The code P0155 indicates a potential issue with the HO2S (heated oxygen sensor) heater performance for Bank 2 Sensor 1 on a Pontiac vehicle.

2. What are the common symptoms of OBDII code P0155 on a Pontiac?

Common symptoms of code P0155 may include poor fuel economy, rough idling, engine hesitation, and an illuminated check engine light on the dashboard.

3. What are the possible causes of OBDII code P0155 on a Pontiac?

Potential causes of code P0155 include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or issues with the engine's computer system.

4. How can I diagnose OBDII code P0155 on my Pontiac?

To diagnose code P0155, you can use an OBDII scanner to retrieve the specific error code, visually inspect the oxygen sensor and related wiring, and test the sensor's heater circuit for proper functioning.

5. Can I continue driving my Pontiac with OBDII code P0155?

While it may be possible to drive your Pontiac with code P0155, it is not recommended as it can lead to decreased fuel efficiency and engine performance. It's best to address the issue promptly.

6. How can I repair OBDII code P0155 on my Pontiac?

Repairing code P0155 typically involves replacing the faulty oxygen sensor, checking and repairing any damaged wiring or connectors, and ensuring the sensor's heater circuit is functioning correctly.

7. Is it necessary to reset the OBDII code P0155 after repairs on a Pontiac?

Yes, it is important to clear the error code P0155 after completing repairs on your Pontiac. This can be done using an OBDII scanner to reset the vehicle's computer system.

8. How can I prevent OBDII code P0155 from appearing on my Pontiac?

To prevent code P0155, it's important to perform regular maintenance on your vehicle, including checking and replacing oxygen sensors as recommended, and addressing any engine performance issues promptly.

9. Can a DIY enthusiast fix OBDII code P0155 on a Pontiac?

Depending on your experience and tools available, a DIY enthusiast may be able to address code P0155 by following repair guides, but it's recommended to consult a professional mechanic for accurate diagnosis and repairs.

10. How much does it cost to repair OBDII code P0155 on a Pontiac?

The cost of repairing code P0155 on a Pontiac can vary depending on the root cause of the issue, the labor rates in your area, and whether you choose to replace the oxygen sensor yourself or have it done by a professional.