AutoCodes – Mazda – P0144 Mazda

P0144 Mazda Code - Rear HO2S Circuit High Input

Quick Answer

The rear heated oxygen sensor (or sensor 3 for some vehicles), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Faulty Heated Oxygen Sensor Bank 1 Sensor 3, Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 3 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: P0144 Mazda indicates Rear HO2S Circuit High Input.
Common causes: Common causes include Faulty Heated Oxygen Sensor Bank 1 Sensor 3, Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 3 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 8,483

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0144 Mazda Description

The rear heated oxygen sensor (or sensor 3 for some vehicles), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Even if switching characteristics of the heated oxygen sensor 1 are shifted, the air-fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 3.
This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 3 is not used for engine control operation.

OBDII Code P0144 Mazda - Rear HO2S Circuit High Input - AutoCodes.com — P0144 Mazda Code - Rear HO2S Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0144 Mazda?

Faulty Heated Oxygen Sensor Bank 1 Sensor 3
Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted
Heated Oxygen Sensor Bank 1 Sensor 3 circuit poor electrical connection

How to Fix the DTC P0144 Mazda?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0144 Mazda 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.

Need more information about the P0144 Mazda code?

Need more information on how to fix the P0144 Mazda code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P0144 Mazda Code

1. What does the OBDII code P0144 for Mazda mean?

The OBDII code P0144 for Mazda indicates a high voltage input from the rear heated oxygen sensor (HO2S) circuit.

2. What are the common symptoms of a P0144 code in a Mazda?

Common symptoms of a P0144 code in a Mazda may include poor fuel economy, rough idling, engine hesitation, and an illuminated check engine light.

3. What are the possible causes of a P0144 code in a Mazda?

Potential causes of a P0144 code in a Mazda include a faulty rear HO2S sensor, wiring issues, exhaust leaks, or a problem with the engine control module (ECM).

4. How can I diagnose a P0144 code in my Mazda?

Diagnosing a P0144 code in a Mazda involves using an OBDII scanner to read the code, inspecting the rear HO2S sensor and its wiring for damage, and testing the sensor's functionality.

5. Can I drive my Mazda with a P0144 code?

It is not recommended to drive your Mazda with a P0144 code, as it can lead to poor engine performance and potential damage to the catalytic converter.

6. How can I repair a P0144 code in my Mazda?

Repairing a P0144 code in a Mazda may involve replacing the rear HO2S sensor, repairing damaged wiring, fixing exhaust leaks, or addressing any ECM issues.

7. Are there any DIY tips for fixing a P0144 code in a Mazda?

DIY tips for fixing a P0144 code in a Mazda include checking and cleaning the sensor connections, ensuring proper wire routing, and using a multimeter to test sensor voltage.

8. How much does it cost to repair a P0144 code in a Mazda?

The cost of repairing a P0144 code in a Mazda can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more for parts and labor.

9. Can a P0144 code in a Mazda cause other problems if left untreated?

If left untreated, a P0144 code in a Mazda can lead to decreased fuel efficiency, engine misfires, and potential damage to the catalytic converter over time.

10. How long does it take to repair a P0144 code in a Mazda?

The time it takes to repair a P0144 code in a Mazda can vary based on the specific issue, but it typically takes a few hours to a full day for diagnosis and repair.