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Engine-Codes – BMW – P0073 BMW

P0073 BMW Code - Ambient Sensor Circuit High

Quick Answer

The P0073 BMW code refers to an issue with the Ambient Sensor Circuit High. Common causes include Faulty Ambient Temperature Sensor: The most common cause of the P0073 code is a malfunctioning ambient temperature sensor, Wiring Issues: Damaged or corroded wiring connections to the ambient sensor can trigger this code, ECM Malfunction: A fault in the engine control module can also lead to the P0073 code. 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
P0073 BMW indicates Ambient Sensor Circuit High.
Common causes
Common causes include Faulty Ambient Temperature Sensor: The most common cause of the P0073 code is a malfunctioning ambient temperature sensor, Wiring Issues: Damaged or corroded wiring connections to the ambient sensor can trigger this code, ECM Malfunction: A fault in the engine control module can also lead to the P0073 code.
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 07, 2024
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Code P0073 BMW Description

The P0073 BMW code refers to an issue with the Ambient Sensor Circuit High. This code indicates that there is a problem with the ambient temperature sensor in the vehicle. The ambient temperature sensor is responsible for measuring the outside temperature and sending this information to the engine control module (ECM) to assist in regulating various systems in the vehicle. When the sensor detects a high voltage signal, it triggers the P0073 code, indicating that there is a malfunction in the sensor circuit.

OBDII Code P0073 BMW - Ambient Sensor Circuit High
P0073 BMW Code - Ambient Sensor Circuit High

Common Causes of P0073 BMW

  1. Faulty Ambient Temperature Sensor: The most common cause of the P0073 code is a malfunctioning ambient temperature sensor.
  2. Wiring Issues: Damaged or corroded wiring connections to the ambient sensor can trigger this code.
  3. ECM Malfunction: A fault in the engine control module can also lead to the P0073 code.
  4. Ambient Sensor Circuit Short: A short circuit in the ambient sensor circuit can cause high voltage readings and trigger this code.

Symptoms of P0073 BMW

  1. Check Engine Light: The most common symptom associated with the P0073 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Inaccurate Temperature Readings: The vehicle may display incorrect outside temperature readings on the dashboard.
  3. Poor Fuel Efficiency: A malfunctioning ambient sensor can lead to reduced fuel efficiency as the ECM may not be able to adjust fuel mixture properly.
  4. Climate Control Issues: The vehicle's climate control system may not work correctly, leading to inconsistent temperature settings inside the cabin.

How to Fix P0073 BMW

  1. Diagnostic Check: The first step in repairing the P0073 code is to perform a diagnostic check to verify the issue and identify the specific cause.
  2. Replace Ambient Temperature Sensor: If the ambient sensor is found to be faulty, it will need to be replaced with a new sensor.
  3. Repair Wiring: Check and repair any damaged or corroded wiring connections to the ambient sensor.
  4. Reset Fault Codes: After completing the repairs, reset the fault codes stored in the ECM to clear the check engine light and ensure the issue has been resolved.

Cost to Fix P0073 BMW

The typical repair costs for addressing the P0073 code can vary depending on the specific cause of the issue and the make and model of the vehicle. On average, the cost of replacing the ambient temperature sensor and addressing any wiring issues can range from $150 to $300. However, it's essential to note that labor rates at auto repair shops can vary, with hourly rates typically between $80 and $150. It's advisable to check with local auto repair shops for a more precise estimate based on your vehicle's specific needs.

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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 P0073 BMW Code

1. What are the common symptoms of OBDII code P0073 in a BMW related to the ambient sensor circuit high?

- Common symptoms include incorrect ambient temperature readings on the vehicle's display, erratic climate control system operation, and potential activation of the Check Engine Light.

2. What are the possible causes of OBDII code P0073 in a BMW?

- The code P0073 in a BMW can be triggered by a faulty ambient air temperature sensor, a damaged sensor wiring harness, or a malfunctioning climate control module.

3. How serious is OBDII code P0073 in a BMW?

- While code P0073 may not directly impact the drivability of the vehicle, it can lead to inaccuracies in temperature readings and affect the performance of the climate control system.

4. How can I diagnose OBDII code P0073 in my BMW?

- Diagnosis typically involves checking the ambient air temperature sensor and its wiring for any visible damage, as well as using a multimeter to test the sensor's resistance values.

5. What are some repair tips for fixing OBDII code P0073 in a BMW?

- Repairing this code usually involves replacing the ambient air temperature sensor and repairing or replacing any damaged wiring or connectors associated with the sensor circuit.

6. Can I drive my BMW with OBDII code P0073?

- While it may be safe to drive the vehicle with this code, it is recommended to address the issue promptly to ensure accurate temperature readings and proper climate control system operation.

7. How much does it cost to repair OBDII code P0073 in a BMW?

- The cost of repairing code P0073 in a BMW can vary depending on the extent of the issue, but it typically involves replacing the sensor and addressing any wiring issues, which can range from $100 to $300 or more.

8. Will OBDII code P0073 reset itself after repair in a BMW?

- In some cases, the Check Engine Light associated with code P0073 may reset itself after the repair is completed and the issue is resolved. However, it is recommended to clear the code using an OBDII scanner to ensure it does not reappear.

9. Can a DIY enthusiast fix OBDII code P0073 in a BMW?

- Depending on your level of automotive repair experience, replacing the ambient air temperature sensor and addressing wiring issues associated with code P0073 can be a DIY-friendly task with the right tools and resources.

10. Are there any recalls related to OBDII code P0073 in BMW vehicles?

- It is recommended to check with BMW or the National Highway Traffic Safety Administration (NHTSA) to see if there are any recalls related to code P0073 in your specific BMW model.

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