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 the part of the car that controls how much air goes into the engine when the car is cold. It's like when you need to breathe more when it's cold outside, but the car can't do it right.
The P1659 code indicates that the throttle actuator control system is not performing as expected during cold start conditions on bank 1 of the engine.
The throttle actuator control system is responsible for regulating the amount of air that enters the engine. During a cold start, the engine requires a specific amount of air to start and run efficiently. This code is triggered when the throttle actuator control system fails to operate within the expected range or performance parameters during a cold start.
• Check Engine Light is on
• Poor engine performance during cold start
• Engine may stall or hesitate
• Faulty throttle actuator
• Wiring or electrical issues in the throttle actuator circuit
• Malfunctioning throttle position sensor
Throttle Actuator: A device that controls the opening and closing of the throttle valve, regulating air intake.
Bank 1: Refers to the side of the engine with cylinder 1, typically in a V-engine configuration.
• Use an OBD-II scanner to confirm the code.
• Inspect the throttle actuator and related wiring for damage or disconnection.
• Test the throttle position sensor for correct operation.
• Replace the faulty throttle actuator.
• Repair or replace damaged wiring or connectors.
• Replace the throttle position sensor if faulty.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $500
Moderate
• Honda Accord
• Toyota Camry
• Ford Focus
• Regular maintenance and inspection of the throttle system.
• Ensure electrical connections are secure and free from corrosion.
• Use high-quality fuel to prevent buildup in the throttle body.
Engine Performance
• Have the vehicle inspected by a professional if the Check Engine Light is on.
• Avoid driving the vehicle if it stalls frequently during cold starts.
Check with the vehicle manufacturer for warranty coverage on emissions and engine components.
This code has been reported in vehicles with electronic throttle control systems, particularly in colder climates.
Moderate – It should be addressed soon to prevent further engine performance issues.
Ignoring this code may lead to increased emissions and potential safety hazards due to engine stalling.
• Vehicle must be cold (not recently driven).
• Perform tests in a safe environment with adequate ventilation.
The throttle actuator is typically located on the throttle body, which is connected to the intake manifold of the engine.
Q: Can I drive my car with a P1659 code?
A: It's not recommended to drive for long periods with this code, as it can lead to poor engine performance and increased emissions.
Q: Will a P1659 code clear itself?
A: The code may clear itself if the issue is intermittent, but it's best to have it diagnosed and repaired to prevent recurrence.
Specialty · Vacuum pump and bleeder
Useful for vacuum checks, actuator testing, and some brake or emissions diagnostics.
Useful for testing vacuum-operated components and some bleeding procedures.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for verifying supporting electrical signals while testing the system.
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Universal · Socket set
A practical metric and SAE socket set for many diagnostic teardowns and component replacements.
Useful for access and removal work during diagnosis.
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