Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car has special sensors that listen for knocking noises in the engine. If one of these sensors isn't working right, it can cause problems. This code means the sensor labeled '4' is having trouble.
The knock sensor detects engine knock or pinging, which is a result of abnormal combustion. Code P1385 indicates an issue with the circuit for knock sensor number 4.
The P1385 code is triggered when the Engine Control Module (ECM) detects a malfunction in the electrical circuit of knock sensor number 4. This sensor is responsible for detecting vibrations caused by engine knock and sending this information to the ECM to adjust ignition timing accordingly.
• Check Engine Light is on
• Poor engine performance
• Increased fuel consumption
• Engine knocking noise
• Faulty knock sensor
• Wiring issues such as a short or open circuit
• Poor electrical connection
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics, second generation
• Use an OBD-II scanner to confirm the code.
• Visually inspect the knock sensor and its wiring.
• Test the knock sensor for proper operation.
• Check the ECM for any faults.
• Replace the faulty knock sensor.
• Repair or replace damaged wiring or connectors.
• Clear the code and test drive the vehicle.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Socket set
• Screwdriver set
$150 - $400
Moderate
• Honda Accord
• Toyota Camry
• Nissan Altima
• Regularly inspect engine wiring harnesses.
• Keep up with scheduled vehicle maintenance.
• Use quality fuel to prevent engine knock.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have a professional diagnose the issue if unsure.
• Avoid hard acceleration until the issue is resolved.
Check if your vehicle's powertrain warranty covers sensor replacements.
The P1385 code has been associated with vehicles that experience frequent engine knocking due to sensor failure.
Moderate – It's important to address this issue to prevent engine damage.
Ignoring this code may lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle driven under normal conditions
The knock sensor is typically located on the engine block, cylinder head, or intake manifold.
Q: Can I drive with a P1385 code?
A: It's possible to drive, but it's not recommended as it can lead to engine damage over time.
Q: How does a knock sensor work?
A: A knock sensor detects engine vibrations caused by knocking and sends signals to the ECM to adjust ignition timing.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.