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Engine-Codes – Acura – P0155 Acura

P0155 Acura Code - A/F Sensor 21 Heater System Malfunction

Quick Answer

The P0155 code for Acura vehicles specifically refers to a malfunction in the A/F sensor 21 heater system. Common causes include Faulty A/F sensor 21, Wiring or connector issues in the sensor circuit, Blown fuse related to the heater system. 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 Acura indicates A/F Sensor 21 Heater System Malfunction.
Common causes
Common causes include Faulty A/F sensor 21, Wiring or connector issues in the sensor circuit, Blown fuse related to the heater system.
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 05, 2024
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Code P0155 Acura Description

The P0155 code for Acura vehicles specifically refers to a malfunction in the A/F sensor 21 heater system. The A/F sensor, also known as the air-fuel ratio sensor, is a crucial component in the vehicle's emissions control system. It is responsible for monitoring the air-fuel mixture in the exhaust gases and providing feedback to the engine computer to ensure optimal combustion. The heater system in the sensor is designed to reach operating temperature quickly, allowing it to start functioning effectively as soon as possible.

OBDII Code P0155 Acura - A/F Sensor 21 Heater System Malfunction
P0155 Acura Code - A/F Sensor 21 Heater System Malfunction

Common Causes of P0155 Acura

  1. Faulty A/F sensor 21
  2. Wiring or connector issues in the sensor circuit
  3. Blown fuse related to the heater system
  4. Engine coolant temperature sensor malfunction
  5. Engine computer (ECU) failure

Symptoms of P0155 Acura

  1. Check Engine Light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Rough idling or stalling
  4. Engine misfires
  5. Increased emissions

How to Fix P0155 Acura

  1. Use an OBD-II scanner to confirm the P0155 code and diagnose the specific issue with the A/F sensor 21 heater system.
  2. Inspect the wiring and connectors for any damage or corrosion. Repair or replace as necessary.
  3. Check the fuse related to the heater system and replace if blown.
  4. Test the A/F sensor 21 and replace if it is faulty.
  5. Clear the code from the ECU and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0155 Acura

The typical repair costs for addressing a P0155 code in an Acura vehicle can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to inquire with local shops for a more accurate estimate.

What does this mean?

Tech Notes for P0155 Acura

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





User Submitted Video

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 Acura Code

1. What is the OBDII code P0155 for Acura?

The OBDII code P0155 for Acura refers to a malfunction in the A/F Sensor 21 Heater System.

2. What are the common symptoms of a P0155 code in an Acura?

Common symptoms of a P0155 code in an Acura may include poor fuel economy, rough idling, and an illuminated check engine light.

3. What causes the P0155 code to appear in an Acura?

The P0155 code in an Acura is typically triggered by a faulty A/F sensor, wiring issues, or a blown fuse related to the A/F sensor heater circuit.

4. How can I diagnose a P0155 code in my Acura?

Diagnosing a P0155 code in your Acura involves using an OBDII scanner to retrieve the code, checking the A/F sensor heater circuit for continuity, and inspecting the sensor and its wiring for any visible damage.

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

It is not recommended to drive your Acura with a P0155 code as it can lead to poor engine performance and potential damage if left unresolved.

6. How do I repair a P0155 code in my Acura?

To repair a P0155 code in your Acura, you may need to replace the faulty A/F sensor, repair any damaged wiring, or replace blown fuses related to the A/F sensor heater circuit.

7. Is it safe to reset the P0155 code in my Acura using an OBDII scanner?

Resetting the P0155 code using an OBDII scanner may temporarily turn off the check engine light, but it is important to address the underlying issue causing the code to prevent further problems.

8. Can a DIY enthusiast fix a P0155 code in an Acura?

Depending on your experience and access to tools, some DIY enthusiasts may be able to fix a P0155 code in an Acura by following repair guides and being cautious with electrical components.

9. How much does it cost to repair a P0155 code in an Acura?

The cost to repair a P0155 code in an Acura can vary depending on the cause of the issue, but it may range from $200 to $500 for parts and labor.

10. Will a P0155 code affect my Acura's emissions or performance?

Yes, a P0155 code in an Acura can affect emissions levels and engine performance, leading to increased fuel consumption and potential issues with passing emissions tests.

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