Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is getting a signal from a sensor that listens for knocking noises in the engine, and the signal is too strong.
The knock sensor detects vibrations caused by engine knocking, and a 'circuit high' signal indicates the sensor is sending a higher voltage than expected.
The P1333 code is triggered when the Engine Control Module (ECM) detects a high voltage signal from the knock sensor circuit 4. This could be due to a malfunctioning sensor, wiring issues, or a problem with the ECM itself.
• Check Engine Light illuminated
• Poor engine performance
• Engine knocking noise
• Faulty knock sensor
• Wiring issues in the knock sensor circuit
• Faulty Engine Control Module (ECM)
Knock Sensor: A device that detects engine knocking and sends signals to the ECM.
ECM: Engine Control Module, the computer that manages engine functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the knock sensor and its wiring for damage.
• Test the voltage signal from the knock sensor.
• Replace the knock sensor if faulty.
• Repair or replace damaged wiring in the knock sensor circuit.
• Replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$150 - $400
Moderate
• Toyota Camry
• Honda Accord
• Nissan Altima
• Regularly inspect engine wiring.
• Use quality fuel to prevent knocking.
• Perform routine engine maintenance.
Sensor Issue
• Avoid hard acceleration until the issue is resolved.
• Get the vehicle inspected by a professional mechanic.
Check if the knock sensor is covered under the vehicle's powertrain warranty.
This code has been commonly associated with sensor failures and wiring issues in older vehicle models.
Moderate – Should be addressed soon to prevent potential engine damage.
Driving with a faulty knock sensor can lead to engine damage and may not pass emissions tests.
• Engine at operating temperature
• Vehicle in park or neutral
The knock sensor is typically located on the engine block, cylinder head, or intake manifold.
Q: Can I drive with a P1333 code?
A: It's not recommended to drive for long periods with this code, as it can lead to engine damage.
Q: How do I reset the P1333 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.
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