AutoCodes – Saturn – P0155 Saturn

P0155 Saturn 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 Saturn 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 9,637

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

What does this mean?

What are the Possible Causes of the DTC P0155 Saturn?

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 Saturn?

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 Saturn 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 Saturn Code

1. What does the OBDII code P0155 for Saturn mean?

The code P0155 indicates an issue with the HO2S (heated oxygen sensor) heater performance for Bank 2 Sensor 1 in a Saturn vehicle.

2. What are common symptoms of a P0155 fault in a Saturn?

Common symptoms of a P0155 fault in a Saturn may include poor fuel economy, rough idling, engine misfires, and an illuminated Check Engine Light.

3. What are the possible causes of a P0155 code in a Saturn?

Possible causes of a P0155 code in a Saturn include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or a malfunctioning ECM (engine control module).

4. How can I diagnose a P0155 fault in my Saturn?

Diagnosing a P0155 fault in your Saturn involves using an OBDII scanner to retrieve the code, inspecting the oxygen sensor and related components for damage, and testing the sensor's heater circuit.

5. Can I drive my Saturn with a P0155 fault?

It is not recommended to drive your Saturn with a P0155 fault, as it can lead to poor engine performance and potential damage to other components over time.

6. How can I repair a P0155 fault in my Saturn?

Repairing a P0155 fault in your Saturn may involve replacing the Bank 2 Sensor 1 oxygen sensor, repairing damaged wiring or connectors, checking and replacing fuses if necessary, and clearing the fault code.

7. Is it necessary to reset the fault code after repairing a P0155 fault in a Saturn?

Yes, it is important to reset the fault code using an OBDII scanner after repairing a P0155 fault in a Saturn to clear the Check Engine Light and monitor if the issue has been resolved.

8. Can a DIY enthusiast fix a P0155 fault in a Saturn?

A DIY enthusiast with proper tools and knowledge of automotive repair may be able to fix a P0155 fault in a Saturn, especially if it involves tasks like replacing the oxygen sensor or checking wiring connections.

9. How much does it typically cost to repair a P0155 fault in a Saturn?

The cost of repairing a P0155 fault in a Saturn can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor if a professional mechanic is involved.

10. How often does a P0155 fault occur in Saturn vehicles?

P0155 faults are relatively common in Saturn vehicles, especially in older models or those with high mileage, due to the normal wear and tear on oxygen sensors and their components.