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P0333 Subaru Code - Knock Sensor 2 Circuit High Input Bank 1 Or Single Sensor

Quick Answer

The P0333 code for Subaru vehicles indicates that there is a high input in the circuit for Knock Sensor 2 in Bank 1 or a single sensor. Common causes include Faulty knock sensor, Wiring issues or shorts in the knock sensor circuit, Corrosion or damage to sensor connectors. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P0333 Subaru indicates Knock Sensor 2 Circuit High Input Bank 1 Or Single Sensor.
Common causes
Common causes include Faulty knock sensor, Wiring issues or shorts in the knock sensor circuit, Corrosion or damage to sensor connectors.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code P0333 Subaru Description

The P0333 code for Subaru vehicles indicates that there is a high input in the circuit for Knock Sensor 2 in Bank 1 or a single sensor. The knock sensor is a crucial component in the engine management system that detects abnormal combustion by monitoring vibrations in the engine. When the knock sensor detects knocking or pinging in the engine, it sends signals to the engine control unit (ECU) to adjust the ignition timing for optimal performance and fuel efficiency. A high input in the knock sensor circuit can lead to incorrect timing adjustments, potentially causing engine misfires, reduced power, and decreased fuel efficiency.

OBDII Code P0333 Subaru - Knock Sensor 2 Circuit High Input Bank 1 Or Single Sensor
P0333 Subaru Code - Knock Sensor 2 Circuit High Input Bank 1 Or Single Sensor

Common Causes of P0333 Subaru

  1. Faulty knock sensor
  2. Wiring issues or shorts in the knock sensor circuit
  3. Corrosion or damage to sensor connectors
  4. Engine overheating leading to sensor malfunction
  5. Engine mechanical issues causing abnormal combustion

Symptoms of P0333 Subaru

  1. Engine knocking or pinging sounds
  2. Decreased engine performance
  3. Poor fuel efficiency
  4. Illuminated check engine light
  5. Engine stalling or hesitation

How to Fix P0333 Subaru

  1. Diagnose the issue by using a scan tool to check for the P0333 code and perform a visual inspection of the knock sensor and wiring.
  2. Test the knock sensor using a multimeter to check for proper resistance and continuity.
  3. Replace the knock sensor if it is found to be faulty, ensuring it is correctly installed and torqued to the manufacturer's specifications.
  4. Inspect and repair any damaged wiring or connectors in the knock sensor circuit.
  5. Clear the fault codes and perform a test drive to ensure the issue is resolved.

Cost to Fix P0333 Subaru

The cost of repairing a P0333 code in a Subaru vehicle can vary depending on the specific model and year of the vehicle, as well as the labor rates in your area. On average, the cost of replacing a knock sensor and addressing related wiring issues can range from $200 to $500. Additional costs may apply if other components need to be replaced or if further diagnostics are required. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate tailored to your vehicle.

What does this mean?

Tech Notes for P0333 Subaru

The P0333 code means that the Knock Sensor is not working properly. Problems with the knock sensor will not cause an engine performance problems. Replacing the knock sensor usually takes care of the problem.

When is the Code Detected?

An excessively high voltage from the sensor is sent to Engine Control Module (ECM)

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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 P0333 Subaru Code

1. What are the common symptoms of OBDII code P0333 in a Subaru related to Knock Sensor 2 Circuit High Input Bank 1 or Single Sensor?

- Common symptoms include engine pinging or knocking noises, reduced engine performance, and illuminated Check Engine Light.

2. What are the possible causes of OBDII code P0333 in a Subaru related to Knock Sensor 2 Circuit High Input Bank 1 or Single Sensor?

- Possible causes include a faulty knock sensor, wiring issues, poor electrical connections, or a problem with the Engine Control Module (ECM).

3. How can I diagnose OBDII code P0333 in a Subaru related to Knock Sensor 2 Circuit High Input Bank 1 or Single Sensor?

- Diagnosis involves using a scan tool to read the code, checking the knock sensor wiring and connections, performing a resistance test on the sensor, and monitoring sensor data while the engine is running.

4. Can I continue driving my Subaru with OBDII code P0333 related to Knock Sensor 2 Circuit High Input Bank 1 or Single Sensor?

- It is not recommended to drive the vehicle with this code present, as it can lead to engine damage and reduced performance. It is best to address the issue promptly.

5. How can I repair OBDII code P0333 in a Subaru related to Knock Sensor 2 Circuit High Input Bank 1 or Single Sensor?

- Repair options include replacing the faulty knock sensor, repairing or replacing damaged wiring, ensuring proper electrical connections, and resetting the ECM.

6. Are there any DIY tips for fixing OBDII code P0333 in a Subaru related to Knock Sensor 2 Circuit High Input Bank 1 or Single Sensor?

- DIY enthusiasts can attempt to replace the knock sensor themselves, following the manufacturer's guidelines and proper safety precautions. However, complex wiring issues may require professional assistance.

7. Will OBDII code P0333 in a Subaru related to Knock Sensor 2 Circuit High Input Bank 1 or Single Sensor affect fuel efficiency?

- Yes, this code can impact fuel efficiency due to engine performance issues caused by improper knock sensor function. Resolving the code can help improve fuel economy.

8. How long does it typically take to repair OBDII code P0333 in a Subaru related to Knock Sensor 2 Circuit High Input Bank 1 or Single Sensor?

- The repair time can vary depending on the exact cause of the issue and the extent of the repair needed. It may take a few hours to a full day to diagnose and fix the problem.

9. Is it necessary to reset the Check Engine Light after repairing OBDII code P0333 in a Subaru related to Knock Sensor 2 Circuit High Input Bank 1 or Single Sensor?

- Yes, it is recommended to reset the Check Engine Light using a scan tool after repairing the issue to clear the code and ensure proper monitoring of the vehicle's systems.

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