P0173 Ford Code - Fuel Trim Malfunction Bank 2
Quick Answer
The P0173 code for Ford vehicles indicates a fuel trim malfunction in bank 2 of the engine. Common causes include Faulty Oxygen Sensor: A malfunctioning oxygen sensor can provide incorrect data to the ECM, leading to improper fuel trim adjustments, Vacuum Leaks: Leaks in the vacuum system can introduce unmetered air into the engine, affecting the air-fuel mixture, Fuel Injector Issues: Clogged or malfunctioning fuel injectors can disrupt fuel delivery to the engine. 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 Ford indicates Fuel Trim Malfunction Bank 2.
- Common causes
- Common causes include Faulty Oxygen Sensor: A malfunctioning oxygen sensor can provide incorrect data to the ECM, leading to improper fuel trim adjustments, Vacuum Leaks: Leaks in the vacuum system can introduce unmetered air into the engine, affecting the air-fuel mixture, Fuel Injector Issues: Clogged or malfunctioning fuel injectors can disrupt fuel delivery to the engine.
- 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.
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Code P0173 Ford Description
The P0173 code for Ford vehicles indicates a fuel trim malfunction in bank 2 of the engine. Fuel trim refers to the adjustment made by the engine control module (ECM) to ensure the proper air-fuel mixture ratio for combustion. In this case, bank 2 refers to the side of the engine that does not contain cylinder number one. A malfunction in the fuel trim on this bank can lead to poor engine performance, decreased fuel efficiency, and potential long-term damage to the engine if left unresolved.
Common Causes of P0173 Ford
- Faulty Oxygen Sensor: A malfunctioning oxygen sensor can provide incorrect data to the ECM, leading to improper fuel trim adjustments.
- Vacuum Leaks: Leaks in the vacuum system can introduce unmetered air into the engine, affecting the air-fuel mixture.
- Fuel Injector Issues: Clogged or malfunctioning fuel injectors can disrupt fuel delivery to the engine.
- Intake Manifold Gasket Leak: A leak in the intake manifold gasket can cause air to enter the engine, affecting fuel trim.
Symptoms of P0173 Ford
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
- Rough Idling: The engine may idle roughly or inconsistently, indicating a problem with fuel delivery.
- Decreased Fuel Efficiency: A malfunction in fuel trim can lead to poor fuel economy as the engine may not be operating at optimal efficiency.
- Engine Misfires: The engine may experience misfires, which can cause a lack of power or hesitation during acceleration.
- Strong Smell of Fuel: There may be a noticeable smell of fuel coming from the vehicle, indicating a potential issue with fuel delivery.
How to Fix P0173 Ford
- Diagnose the Issue: Use a diagnostic scanner to read the trouble codes and perform a thorough inspection of the fuel delivery system.
- Replace Oxygen Sensor: If the oxygen sensor is faulty, replace it with a new sensor to ensure accurate readings.
- Repair Vacuum Leaks: Inspect the vacuum system for leaks and repair any damaged hoses or connections.
- Clean or Replace Fuel Injectors: Clean clogged fuel injectors or replace malfunctioning injectors to restore proper fuel delivery.
- Repair Intake Manifold Gasket: Replace the intake manifold gasket if a leak is detected to prevent further air entering the engine.
Cost to Fix P0173 Ford
The cost of repairing a P0173 code for a Ford vehicle can vary depending on the specific cause of the issue. On average, the repair costs can range from $200 to $500, including parts and labor. However, it's essential to consider that diagnostic time and labor rates at auto repair shops can vary significantly. It's recommended to obtain quotes from local shops to get a more accurate estimate for the repair.
Tech Notes for P0173 Ford
When is the Code Detected?
- The amount of mixture ratio compensation is not correct
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Frequently Asked Questions about P0173 Ford Code
What does the OBDII code P0173 mean on a Ford vehicle?
1. P0173 indicates a "Fuel Trim Malfunction Bank 2," meaning the engine control module (ECM) is detecting an issue with the fuel mixture adjustments on the bank of cylinders opposite the number one cylinder. 2.
What are the common symptoms of a P0173 code in a Ford?
Symptoms may include poor fuel economy, rough idling, engine misfires, hesitation during acceleration, and the check engine light illuminating. 3.
What causes the P0173 code on a Ford?
Common causes include a faulty mass airflow (MAF) sensor, vacuum leaks, exhaust leaks before the oxygen sensor, clogged fuel injectors, a failing fuel pressure regulator, or defective oxygen sensors. 4.
How does a vacuum leak trigger the P0173 code on a Ford?
A vacuum leak allows unmetered air into the engine, causing the air-fuel mixture to become too lean, which the ECM struggles to correct, triggering the code. 5.
Can a dirty mass airflow (MAF) sensor cause the P0173 code?
Yes, a dirty or faulty MAF sensor can misread the airflow entering the engine, leading to incorrect fuel adjustments and triggering the code. 6.
Is it safe to drive a Ford with a P0173 code?
While it may be possible to drive with this code, it is not recommended as it can lead to reduced performance, increased emissions, and potential engine damage if left unaddressed. 7.
How can I diagnose the P0173 code on my Ford?
Start by checking for vacuum leaks, inspecting the MAF sensor, testing the oxygen sensors, and ensuring the fuel injectors and fuel pressure are functioning properly. Scanning live data with an OBDII tool can also help pinpoint the issue. 8.
What repairs can fix the P0173 code on a Ford?
Repairs may include cleaning or replacing the MAF sensor, fixing vacuum or exhaust leaks, replacing faulty oxygen sensors, cleaning fuel injectors, or repairing issues with the fuel pressure regulator. 9.
How much does it cost to fix a P0173 code on a Ford?
Repair costs vary depending on the cause but can range from $50 for a sensor cleaning to several hundred dollars for parts like oxygen sensors or injectors. 10.
Can a clogged air filter cause a P0173 code on a Ford?
A severely clogged air filter can restrict airflow to the engine, potentially causing fuel trim issues, but it is less common compared to other causes like MAF sensor or vacuum leaks.
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