Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with a sensor that helps control how the engine's parts move on one side of the engine.
The P266A code indicates an issue with the rocker arm actuator position sensor circuit in bank 2 of the engine.
The rocker arm actuator position sensor monitors the position of the rocker arms in the engine. This sensor sends data to the engine control module (ECM) to ensure optimal timing and performance. When the ECM detects a fault in the sensor circuit for bank 2, it triggers the P266A code.
• Check Engine Light is on
• Reduced engine performance
• Engine misfires
• Faulty rocker arm actuator position sensor
• Wiring issues in the sensor circuit
• Faulty ECM
Rocker Arm: A component that transfers camshaft motion to the valves.
ECM: Engine Control Module, the computer that controls engine functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the rocker arm actuator position sensor for proper operation.
• Replace the faulty rocker arm actuator position sensor.
• Repair or replace damaged wiring or connectors.
• Update or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$150 - $500
Moderate
• Honda Accord
• Toyota Camry
• Ford F-150
• Regular maintenance checks
• Ensure proper oil levels
• Inspect wiring regularly
Sensor Issue
• Do not ignore the Check Engine Light.
• Get the vehicle inspected by a professional if unsure.
• Regularly maintain the vehicle to prevent sensor issues.
Check with the vehicle manufacturer for warranty coverage on engine sensors.
The P266A code has been commonly reported in vehicles with variable valve timing systems.
Moderate – It should be addressed soon to prevent further engine issues.
Driving with this code may lead to reduced performance and increased emissions.
• Engine at normal operating temperature
• Vehicle in park or neutral
The rocker arm actuator position sensor is located on the cylinder head of bank 2.
Q: Can I drive with the P266A code?
A: It's possible, but not recommended as it may lead to further engine damage.
Q: How do I clear the P266A code?
A: After repairs, use an OBD-II scanner to clear the code from the ECM.
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Universal · Digital multimeter
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Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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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.