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P0333 Lexus Code - Knock Sensor 2 Circuit High Input

Quick Answer

The P0333 diagnostic trouble code (DTC) in a Lexus indicates that there is a high input signal detected in the circuit for Knock Sensor 2. Common causes include Faulty knock sensor, Wiring issues or shorts in the knock sensor circuit, Corrosion or poor connections in the sensor circuit. 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
P0333 Lexus indicates Knock Sensor 2 Circuit High Input.
Common causes
Common causes include Faulty knock sensor, Wiring issues or shorts in the knock sensor circuit, Corrosion or poor connections in the sensor circuit.
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 06, 2024
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Code P0333 Lexus Description

The P0333 diagnostic trouble code (DTC) in a Lexus indicates that there is a high input signal detected in the circuit for Knock Sensor 2. Knock sensors are crucial components in a vehicle's engine management system that detect abnormal engine vibrations, often caused by knocking or pinging. When the knock sensor detects these vibrations, it sends a signal to the engine control module (ECM) to adjust the ignition timing to prevent engine damage.

OBDII Code P0333 Lexus - Knock Sensor 2 Circuit High Input
P0333 Lexus Code - Knock Sensor 2 Circuit High Input

Common Causes of P0333 Lexus

  1. Faulty knock sensor
  2. Wiring issues or shorts in the knock sensor circuit
  3. Corrosion or poor connections in the sensor circuit
  4. Engine mechanical problems causing abnormal vibrations
  5. ECM malfunction

Symptoms of P0333 Lexus

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

How to Fix P0333 Lexus

  1. Begin by diagnosing the specific cause of the high input signal in Knock Sensor 2, using a scan tool to retrieve freeze frame data and pinpoint the issue.
  2. Inspect the knock sensor and its wiring for any visible damage, corrosion, or loose connections. Replace the knock sensor if necessary.
  3. Test the sensor circuit for proper voltage and continuity, repairing any wiring issues or shorts as needed.
  4. Clear the DTC and perform a test drive to ensure that the issue has been resolved and that the check engine light does not reappear.
  5. If the problem persists, further diagnostics may be required to identify any underlying engine mechanical issues or ECM problems.

Cost to Fix P0333 Lexus

The cost of repairing a high input signal in Knock Sensor 2 in a Lexus can vary depending on the specific cause of the issue. Generally, replacement knock sensors can range from $50 to $200, with additional costs for labor and diagnostic testing. Overall, the total repair cost can range from $150 to $500 or more, depending on the extent of the problem and the rates charged by the repair shop. It is recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on your vehicle's make and model. Labor rates at auto repair shops typically range from $80 to $150 per hour, so the total cost can be influenced by the time required for diagnosis and repairs.

What does this mean?

Tech Notes for P0333 Lexus

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.

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