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Engine-Codes – Audi – P0066 Audi

P0066 Audi Code - Air Assisted Injector Control Circuit Or Circuit Low

Quick Answer

The P0066 diagnostic trouble code (DTC) for Audi vehicles indicates a problem with the air assisted injector control circuit or a circuit low issue. Common causes include Faulty Air Assisted Injector: A malfunctioning air assisted injector can trigger this code, Wiring Issues: Problems with the wiring harness or connectors associated with the air assisted injector circuit can cause a low voltage condition, ECM Malfunction: A fault in the Engine Control Module (ECM) can also lead to this code being triggered. 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
P0066 Audi indicates Air Assisted Injector Control Circuit Or Circuit Low.
Common causes
Common causes include Faulty Air Assisted Injector: A malfunctioning air assisted injector can trigger this code, Wiring Issues: Problems with the wiring harness or connectors associated with the air assisted injector circuit can cause a low voltage condition, ECM Malfunction: A fault in the Engine Control Module (ECM) can also lead to this code being triggered.
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 P0066 Audi Description

The P0066 diagnostic trouble code (DTC) for Audi vehicles indicates a problem with the air assisted injector control circuit or a circuit low issue. This code is typically associated with the air assisted injector system, which is responsible for injecting additional air into the exhaust system to help reduce emissions. The air assisted injector system works in conjunction with the catalytic converter to ensure that harmful emissions are minimized.

OBDII Code P0066 Audi - Air Assisted Injector Control Circuit Or Circuit Low
P0066 Audi Code - Air Assisted Injector Control Circuit Or Circuit Low

Common Causes of P0066 Audi

  1. Faulty Air Assisted Injector: A malfunctioning air assisted injector can trigger this code.
  2. Wiring Issues: Problems with the wiring harness or connectors associated with the air assisted injector circuit can cause a low voltage condition.
  3. ECM Malfunction: A fault in the Engine Control Module (ECM) can also lead to this code being triggered.
  4. Short Circuit: A short circuit in the wiring can cause a low voltage condition in the circuit controlling the air assisted injector.

Symptoms of P0066 Audi

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Reduced Performance: The vehicle may experience a decrease in performance, including reduced power and acceleration.
  3. Poor Fuel Efficiency: A decrease in fuel efficiency may be noticed, as the engine may not be operating at optimal levels.
  4. Rough Idling: The engine may idle roughly or inconsistently, indicating a potential issue with the air assisted injector system.

How to Fix P0066 Audi

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific DTC and pinpoint the exact cause of the problem.
  2. Inspect Wiring and Connectors: Check the wiring harness and connectors for any signs of damage, corrosion, or loose connections.
  3. Test Air Assisted Injector: Test the air assisted injector to ensure it is functioning properly and replace if necessary.
  4. Check ECM: Verify the ECM for any faults or errors and address any issues found.
  5. Clear DTCs: Clear the DTCs from the ECM memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0066 Audi

The cost of repairing a P0066 code on an Audi can vary depending on the specific cause of the issue. On average, the repair costs for this type of problem can range from $200 to $500, including parts and labor. However, it's important to note that labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Additional costs may apply if any parts need to be replaced. It's recommended to consult with a qualified mechanic to get an accurate estimate based on your vehicle's make and model.

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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 P0066 Audi Code

1. What are the common symptoms of OBDII code P0066 in an Audi?

- Common symptoms include rough idling, poor acceleration, decreased fuel efficiency, and potential stalling of the engine.

2. What can cause the OBDII code P0066 to trigger in an Audi?

- The code P0066 is typically triggered by issues with the air assisted injector control circuit, such as a faulty air assisted injector, damaged wiring, or a malfunctioning control module.

3. How can I diagnose the cause of OBDII code P0066 in my Audi?

- To diagnose the issue, you can start by checking the wiring and connections related to the air assisted injector, testing the injector itself, and using a diagnostic scanner to gather more information about the fault.

4. Is it safe to continue driving my Audi with OBDII code P0066 present?

- It is not recommended to drive with the code present, as it can lead to further damage to the engine and affect the overall performance of the vehicle.

5. Can I repair OBDII code P0066 in my Audi myself?

- While some DIY enthusiasts may attempt to repair the issue themselves, it is recommended to seek professional help to accurately diagnose and fix the underlying problem causing the code.

6. How much does it typically cost to repair OBDII code P0066 in an Audi?

- The cost of repairing OBDII code P0066 can vary depending on the specific issue causing the fault. It is advisable to get a diagnosis from a mechanic to get an accurate estimate.

7. Are there any preventive measures to avoid OBDII code P0066 in an Audi?

- Regular maintenance checks, such as inspecting the air assisted injector system and ensuring proper wiring connections, can help prevent issues that may trigger the code P0066.

8. Can a faulty air filter cause OBDII code P0066 in an Audi?

- While a dirty or clogged air filter can affect engine performance, it is not a direct cause of the OBDII code P0066 related to the air assisted injector control circuit.

9. Will resetting the OBDII code P0066 clear the issue in an Audi?

- Resetting the code may temporarily clear the check engine light, but if the underlying issue is not addressed, the code is likely to reappear during driving.

10. How long does it take to repair OBDII code P0066 in an Audi?

- The repair time for OBDII code P0066 can vary depending on the complexity of the issue. It is best to consult with a mechanic to get an estimate of the repair time needed.

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