Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means your car's computer has detected a very strong knocking sound in the engine, and it has cut off the fuel to prevent damage.
The engine control unit (ECU) has detected severe knocking, which is a type of abnormal combustion, and has cut off fuel to prevent engine damage.
P137F is triggered when the ECU detects a level of knocking beyond the normal threshold. This is often due to pre-ignition or detonation, which can cause significant engine damage if not addressed. The ECU responds by cutting off the fuel supply to protect the engine.
• Check Engine Light is on
• Reduced engine performance
• Unusual knocking noise from the engine
• Poor quality fuel
• Faulty knock sensor
• Incorrect ignition timing
ECU: Engine Control Unit
Knock Sensor: A device that detects engine knocking
• Check the fuel quality and replace if necessary.
• Inspect the knock sensor for proper operation.
• Verify and adjust ignition timing if needed.
• Replace the knock sensor if faulty.
• Use higher-octane fuel.
• Adjust the ignition timing to factory specifications.
• OBD-II scanner
• Timing light
• Fuel pressure gauge
$150 - $500
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Use high-quality fuel.
• Regularly maintain the ignition system.
• Perform periodic engine checks.
Engine Performance
• Avoid driving aggressively until the issue is fixed.
• Use premium fuel if recommended by the manufacturer.
Check with your vehicle manufacturer for specific warranty coverage related to engine components.
This code has been more common in vehicles using lower-quality fuel or with ignition system issues.
High – Immediate attention is required to prevent engine damage.
Driving with this code active can lead to significant engine damage and may violate emissions regulations.
• Engine at operating temperature
• Vehicle under load
The knock sensor is typically located on the engine block, cylinder head, or intake manifold.
Q: What is engine knocking?
A: Engine knocking is a noise caused by improper combustion in the engine cylinders.
Q: Can I drive with a P137F code?
A: It's not recommended to drive with this code active as it can lead to severe engine damage.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.
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.
View options on Amazon
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.