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P0173 Mazda Code - Bank 2 Adaptive Fuel Table At Calibrated Limit

Quick Answer

The P0173 diagnostic trouble code (DTC) for Mazda vehicles indicates that the Bank 2 Adaptive Fuel Table is at its calibrated limit. Common causes include Faulty oxygen sensor: A malfunctioning oxygen sensor can provide incorrect feedback to the ECM, leading to improper fuel mixture adjustments, Vacuum leaks: Leaks in the intake system can introduce unmetered air, affecting the fuel mixture, Fuel system issues: Problems with the fuel injectors, fuel pressure regulator, or fuel pump can disrupt the fuel delivery, causing the fuel mixture to be off. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0173 Mazda indicates Bank 2 Adaptive Fuel Table At Calibrated Limit.
Common causes
Common causes include Faulty oxygen sensor: A malfunctioning oxygen sensor can provide incorrect feedback to the ECM, leading to improper fuel mixture adjustments, Vacuum leaks: Leaks in the intake system can introduce unmetered air, affecting the fuel mixture, Fuel system issues: Problems with the fuel injectors, fuel pressure regulator, or fuel pump can disrupt the fuel delivery, causing the fuel mixture to be off.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0173 Mazda Description

The P0173 diagnostic trouble code (DTC) for Mazda vehicles indicates that the Bank 2 Adaptive Fuel Table is at its calibrated limit. This means that the engine control module (ECM) has detected that the fuel mixture on Bank 2 (cylinders 4, 5, and 6 in a V6 engine) is too rich or too lean beyond the predetermined limits set by the manufacturer. The ECM constantly adjusts the fuel mixture based on various sensor inputs to ensure optimal combustion and engine performance. When the adaptive fuel table reaches its limit, it signifies that the ECM is unable to make further adjustments to correct the fuel mixture, which can lead to drivability issues and potential long-term damage if left unaddressed.

OBDII Code P0173 Mazda - Bank 2 Adaptive Fuel Table At Calibrated Limit
P0173 Mazda Code - Bank 2 Adaptive Fuel Table At Calibrated Limit

Common Causes of P0173 Mazda

  1. Faulty oxygen sensor: A malfunctioning oxygen sensor can provide incorrect feedback to the ECM, leading to improper fuel mixture adjustments.
  2. Vacuum leaks: Leaks in the intake system can introduce unmetered air, affecting the fuel mixture.
  3. Fuel system issues: Problems with the fuel injectors, fuel pressure regulator, or fuel pump can disrupt the fuel delivery, causing the fuel mixture to be off.
  4. Exhaust leaks: Leaks in the exhaust system before the oxygen sensor can affect the sensor's readings and lead to a skewed fuel mixture.

Symptoms of P0173 Mazda

  1. Decreased fuel efficiency: A rich or lean fuel mixture can result in poor fuel economy as the engine may not be burning fuel efficiently.
  2. Rough idling or stalling: Incorrect fuel mixture can cause the engine to idle roughly or even stall, especially at low speeds or when coming to a stop.
  3. Engine misfires: The engine may misfire due to an improper fuel mixture, leading to a lack of power and rough running.
  4. Check Engine Light: The illumination of the Check Engine Light on the dashboard is a common symptom associated with this code.

How to Fix P0173 Mazda

  1. Diagnose the issue: Use a scan tool to retrieve the DTC and further diagnose the underlying cause of the rich or lean fuel mixture.
  2. Inspect oxygen sensors: Check the oxygen sensors for proper operation and replace any faulty sensors if necessary.
  3. Check for vacuum leaks: Inspect the intake system for any vacuum leaks and repair or replace affected components.
  4. Test fuel system components: Verify the fuel injectors, fuel pressure regulator, and fuel pump for proper operation and address any issues found.
  5. Clear DTC and test drive: After completing the repairs, clear the DTC from the ECM's memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0173 Mazda

The typical repair costs for addressing a P0173 code can vary depending on the specific cause of the issue. On average, the parts and labor for diagnosing and repairing this problem can range from $200 to $500. However, it's essential to note that actual costs can fluctuate based on factors such as the location of the repair shop, the make and model of the vehicle, and the extent of the repairs needed. It's recommended to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on your vehicle's specific circumstances.

When is the Code Detected?

- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is not correct

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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 P0173 Mazda Code

1. What are the common symptoms of OBDII code P0173 on a Mazda indicating Bank 2 Adaptive Fuel Table At Calibrated Limit?

The common symptoms include rough idling, decreased fuel efficiency, and the Check Engine light illuminating on the dashboard.

2. What are the possible causes of OBDII code P0173 in a Mazda, specifically related to Bank 2 Adaptive Fuel Table At Calibrated Limit?

Potential causes may include a faulty oxygen sensor, a vacuum leak in the intake system, a malfunctioning fuel injector, or issues with the mass airflow sensor.

3. How can I diagnose the OBDII code P0173 on my Mazda related to Bank 2 Adaptive Fuel Table At Calibrated Limit?

Diagnosis involves using an OBDII scanner to read the code, checking for any accompanying codes, inspecting the oxygen sensor, conducting a smoke test for vacuum leaks, and testing the fuel injectors.

4. What are the recommended repair tips for addressing OBDII code P0173 in a Mazda with Bank 2 Adaptive Fuel Table At Calibrated Limit?

Repair tips may include replacing the oxygen sensor, fixing any vacuum leaks, cleaning or replacing the fuel injectors, and ensuring proper airflow through the intake system.

5. Can driving with OBDII code P0173 related to Bank 2 Adaptive Fuel Table At Calibrated Limit cause further damage to my Mazda?

Continuing to drive with this code may lead to decreased engine performance, potential damage to the catalytic converter, and increased fuel consumption.

6. How crucial is it to address OBDII code P0173 on a Mazda signaling Bank 2 Adaptive Fuel Table At Calibrated Limit promptly?

It is important to address this code promptly to prevent further issues, maintain optimal engine performance, and prevent potential damage to other components in the vehicle.

7. Is it possible to reset the OBDII code P0173 on a Mazda with Bank 2 Adaptive Fuel Table At Calibrated Limit without making any repairs?

While clearing the code may temporarily turn off the Check Engine light, the underlying issue causing the code will persist until properly diagnosed and repaired.

8. Are there any preventive measures to avoid encountering OBDII code P0173 related to Bank 2 Adaptive Fuel Table At Calibrated Limit in a Mazda?

Regular maintenance, such as changing the oxygen sensor at recommended intervals, inspecting for vacuum leaks, and using quality fuel, can help prevent this code from appearing.

9. How long does it typically take to repair OBDII code P0173 on a Mazda linked to Bank 2 Adaptive Fuel Table At Calibrated Limit?

The repair duration can vary based on the specific cause of the code, but it may take anywhere from a few hours to a day, depending on the complexity of the issue.

10. Can a DIY enthusiast with basic automotive knowledge fix OBDII code P0173 in a Mazda associated with Bank 2 Adaptive Fuel Table At Calibrated Limit?

While some repairs related to this code may be DIY-friendly, diagnosing and fixing certain underlying issues may require specialized tools and expertise, making professional assistance advisable in some cases.

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