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Engine-Codes – Honda – P0159 Honda

P0159 Honda Code - O2 Sensor Circuit Slow Response Bank 2 Sensor 2

Quick Answer

The P0159 code for Honda vehicles indicates an issue with the O2 sensor circuit for Bank 2 Sensor 2, specifically a slow response. Common causes include Faulty O2 sensor, Damaged wiring or connectors, Exhaust leaks. 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
P0159 Honda indicates O2 Sensor Circuit Slow Response Bank 2 Sensor 2.
Common causes
Common causes include Faulty O2 sensor, Damaged wiring or connectors, Exhaust leaks.
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 12, 2024
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Code P0159 Honda Description

The P0159 code for Honda vehicles indicates an issue with the O2 sensor circuit for Bank 2 Sensor 2, specifically a slow response. The O2 sensor, also known as the oxygen sensor, plays a crucial role in 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. Bank 2 Sensor 2 refers to the sensor located downstream of the catalytic converter on the side of the engine that contains cylinder number 2.

OBDII Code P0159 Honda - O2 Sensor Circuit Slow Response Bank 2 Sensor 2
P0159 Honda Code - O2 Sensor Circuit Slow Response Bank 2 Sensor 2

Common Causes of P0159 Honda

  1. Faulty O2 sensor
  2. Damaged wiring or connectors
  3. Exhaust leaks
  4. Vacuum leaks
  5. ECM issues

Symptoms of P0159 Honda

  1. Decreased fuel efficiency
  2. Increased emissions
  3. Rough idling
  4. Hesitation during acceleration
  5. Engine misfires

How to Fix P0159 Honda

  1. Use an OBD-II scanner to confirm the P0159 code and identify the specific sensor location.
  2. Inspect the wiring and connectors for any signs of damage or corrosion. Repair or replace as needed.
  3. Check for exhaust leaks and repair them if present.
  4. Test the O2 sensor using a multimeter to determine if it is functioning properly. Replace the sensor if necessary.
  5. Clear the code from the ECM and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0159 Honda

The typical repair costs for addressing a P0159 code on a Honda vehicle can range from $150 to $400, including parts and labor. However, it's important to note that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's recommended to check local rates for a more accurate estimate.

What does this mean?

Tech Notes for P0159 Honda

Replacing the O2 Sensor 2 usually takes care of the problem

When is the Code Detected?

The P0159 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor takes more time to respond between rich and lean than the specified time.

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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.

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