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Engine-Codes – Generic – B0173

B0173 Code - Output Air Temperature Sensor 1 Circuit

Quick Answer

The B0173 code indicates a problem with the Output Air Temperature Sensor 1 Circuit in the vehicle. Common causes include Faulty Output Air Temperature Sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning engine control module. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
B0173 indicates Output Air Temperature Sensor 1 Circuit.
Common causes
Common causes include Faulty Output Air Temperature Sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning engine control module.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code B0173 Description

The B0173 code indicates a problem with the Output Air Temperature Sensor 1 Circuit in the vehicle. This sensor is responsible for monitoring the temperature of the air leaving the HVAC system and sending that information to the engine control module. The ECM uses this data to adjust the air-fuel mixture and optimize engine performance. When this sensor circuit malfunctions, it can lead to a variety of issues that affect the vehicle's performance.

OBDII Code B0173 - Output Air Temperature Sensor 1 Circuit
B0173 Code - Output Air Temperature Sensor 1 Circuit

Common Causes of B0173

  1. Faulty Output Air Temperature Sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Malfunctioning engine control module
  4. Corrosion or debris impacting sensor performance

Symptoms of B0173

  1. Check engine light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Engine running rich or lean
  4. Reduced power output
  5. Increased emissions

How to Fix B0173

  1. Diagnose the code using a diagnostic scanner to pinpoint the exact cause of the issue.
  2. Inspect the Output Air Temperature Sensor and its wiring for any visible damage or corrosion.
  3. Test the sensor's resistance and voltage output to ensure it is functioning correctly.
  4. Replace the Output Air Temperature Sensor if it is found to be faulty.
  5. Clear the diagnostic trouble codes and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix B0173

The typical repair costs for addressing the B0173 code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Generally, replacing the Output Air Temperature Sensor can cost between $100 and $200, including parts and labor. Additional costs may apply if there are other underlying issues contributing to the problem. It's recommended to consult with a professional mechanic for a more accurate estimate based on the vehicle's make and model, as well as the local labor rates.

What does this mean?

Tech Notes for B0173

B0173 05: Output Air Temperature Sensor 1 Circuit Short to Battery or Open

B0173 02: Output Air Temperature Sensor 1 Circuit Short to Ground

Need more information about the B0173 code?

Need more information on how to fix the B0173 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0173 code diagnosed by a professional: Find a repair shop in your area

Code B0173 Information for Specific Makes

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 B0173 Code

1. What are the common symptoms of OBDII code B0173 related to the Output Air Temperature Sensor 1 Circuit?

The common symptoms include poor engine performance, decreased fuel efficiency, and potential issues with the vehicle's emissions system.

2. What are the possible causes of OBDII code B0173?

Possible causes of code B0173 can include a faulty output air temperature sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module.

3. How can I diagnose the cause of OBDII code B0173?

Diagnosing code B0173 typically involves using an OBDII scanner to read the code, checking the sensor's wiring and connections, testing the sensor itself, and inspecting the engine control module for any faults.

4. Can a faulty output air temperature sensor be repaired, or does it need to be replaced?

In most cases, a faulty output air temperature sensor will need to be replaced rather than repaired. It is important to use a high-quality replacement sensor to ensure proper functioning.

5. Are there any DIY repair tips for fixing OBDII code B0173?

DIY repair tips for code B0173 may include checking and cleaning the sensor connections, inspecting the sensor wiring for damage, and ensuring the sensor is securely mounted in place.

6. How urgent is it to address OBDII code B0173?

While OBDII code B0173 may not cause immediate harm to your vehicle, it is important to address it promptly to prevent further damage to the engine and maintain optimal performance and fuel efficiency.

7. Can OBDII code B0173 cause my vehicle to fail an emissions test?

Yes, if left unresolved, OBDII code B0173 can affect your vehicle's emissions system, potentially causing it to fail an emissions test due to increased emissions or improper sensor readings.

8. How long does it typically take to repair OBDII code B0173?

The repair time for OBDII code B0173 can vary depending on the exact cause of the issue and the complexity of the repair. It may take anywhere from 30 minutes to a few hours to complete the repair.

9. Is it safe to continue driving my vehicle with OBDII code B0173 present?

While it may be safe to drive your vehicle with code B0173 present, it is not recommended as it can lead to decreased performance and fuel efficiency. It is best to address the issue promptly.

10. Can resetting the OBDII system clear code B0173, or does it require a proper repair?

Simply resetting the OBDII system may temporarily clear the code, but it will likely reappear if the underlying issue is not properly repaired. It is important to diagnose and fix the root cause of the problem.

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