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Engine-Codes – BMW – P1333 BMW

P1333 BMW Code - Knock Sensor 4 High Input

Quick Answer

The P1333 BMW code indicates that the knock sensor 4 in the vehicle is detecting a high input signal. Common causes include Faulty knock sensor 4, Wiring or connector issues related to knock sensor 4, Engine mechanical problems causing abnormal vibrations. 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
P1333 BMW indicates Knock Sensor 4 High Input.
Common causes
Common causes include Faulty knock sensor 4, Wiring or connector issues related to knock sensor 4, Engine mechanical problems causing abnormal vibrations.
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 Sep 10, 2024
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Code P1333 BMW Description

The P1333 BMW code indicates that the knock sensor 4 in the vehicle is detecting a high input signal. The knock sensor is responsible for detecting abnormal vibrations in the engine caused by detonation or knocking. 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 P1333 BMW - Knock Sensor 4 High Input
P1333 BMW Code - Knock Sensor 4 High Input

Common Causes of P1333 BMW

  1. Faulty knock sensor 4
  2. Wiring or connector issues related to knock sensor 4
  3. Engine mechanical problems causing abnormal vibrations
  4. ECM software or hardware issues
  5. Incorrect ignition timing settings

Symptoms of P1333 BMW

  1. Engine knocking or pinging noises
  2. Decreased engine performance
  3. Poor fuel economy
  4. Check Engine Light illuminated
  5. Rough idling or stalling

How to Fix P1333 BMW

  1. Diagnose the issue by using a scan tool to read the code and data from the knock sensor 4.
  2. Inspect the wiring and connectors related to knock sensor 4 for any damage or loose connections.
  3. Test the knock sensor 4 using a multimeter to check for proper resistance and voltage output.
  4. Replace the knock sensor 4 if it is found to be faulty.
  5. Clear the code from the ECM and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1333 BMW

The cost of repairing a knock sensor 4 high input issue can vary depending on the make and model of the vehicle, as well as the labor rates at the auto repair shop. On average, the cost of replacing a knock sensor can range from $150 to $300, including parts and labor. However, additional costs may apply if there are other underlying issues that need to be addressed. It's recommended to consult with a certified mechanic for a more accurate cost estimate based on the specific vehicle and location.

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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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