AutoCodes – Hyundai – P0155 Hyundai

P0155 Hyundai Code - HO2S 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 Hyundai indicates HO2S 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 6,566

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 Hyundai 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 Hyundai - HO2S Heater Circuit Bank 2 Sensor 1 - AutoCodes.com — P0155 Hyundai Code - HO2S Heater Circuit Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0155 Hyundai?

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 Hyundai?

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 Engine Control Module (ECM) monitors how long it take the sensor to warm up and start sending an adequate signal. The code means the the sensor is taking too long to warm up. Replacing the Front Heated Oxygen Sensor (H2OS) Bank 2 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0155 Hyundai 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 Hyundai Code

1. What does the OBDII code P0155 Hyundai mean?

The code P0155 for Hyundai indicates an issue with the HO2S (Heated Oxygen Sensor) Heater Circuit for Bank 2 Sensor 1.

2. What are common symptoms of a P0155 Hyundai code?

Common symptoms of a P0155 code may include poor fuel economy, rough idling, engine misfires, and the illumination of the Check Engine Light.

3. What are possible causes of a P0155 Hyundai code?

Possible causes of a P0155 code can include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or a problem with the engine control module.

4. How can I diagnose a P0155 code on my Hyundai?

Diagnosing a P0155 code typically involves using an OBDII scanner to read the code, inspecting the oxygen sensor and related wiring, checking for blown fuses, and testing the heater circuit.

5. Can I drive my Hyundai with a P0155 code?

It is not recommended to drive your Hyundai with a P0155 code for an extended period, as it can lead to decreased fuel efficiency and potential damage to the catalytic converter.

6. How do I repair a P0155 code on my Hyundai?

Repairing a P0155 code may involve replacing the Bank 2 Sensor 1 oxygen sensor, repairing damaged wiring or connectors, replacing blown fuses, or reprogramming the engine control module.

7. Will resetting the OBDII code P0155 on my Hyundai make it go away permanently?

Resetting the P0155 code may temporarily turn off the Check Engine Light, but if the underlying issue is not addressed, the code is likely to reappear.

8. How much does it cost to fix a P0155 Hyundai code?

The cost of fixing a P0155 code on a Hyundai can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Can a P0155 code affect my Hyundai's emissions?

Yes, a P0155 code can impact your Hyundai's emissions by potentially causing higher levels of pollutants to be released into the environment.

10. How long does it take to repair a P0155 code on a Hyundai?

The time it takes to repair a P0155 code on a Hyundai can vary based on the extent of the issue and the availability of parts, but it typically takes a few hours to complete the repair.