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<h2>What is the throttle position sensor?&nbsp;</h2>
The throttle position sensor (TPS) monitors the position of the throttle plate, which controls the airflow into the engine. By providing real-time feedback on how much the driver is pressing the gas pedal, the TPS helps the engine control unit (ECU) adjust the air-fuel mixture for optimal performance and efficiency.
<h2>Symptoms of a bad TPS&nbsp;throttle position sensor</h2>
A failing or malfunctioning Throttle Position Sensor (TPS) can manifest various symptoms, which may vary in severity. If you notice these situations, they may indicate a potential issue with the TPS:
<ul>
<li>Poor Acceleration: Sluggish or delayed response when pressing the gas pedal.</li>
<li>Rough Idle: An unstable or fluctuating engine idle.</li>
<li>Stalling: Unexpected engine shutdown, especially at stops.</li>
<li>Hesitation During Acceleration: Delayed acceleration after pressing the gas pedal.</li>
<li>Surging or Bucking: Jerking or lurching movements during acceleration or at constant speeds.</li>
<li>Inconsistent Idle Speed: Fluctuating engine idle speed.</li>
<li>Check Engine Light (CEL): Illumination of the Check Engine Light on the dashboard.</li>
<li>Poor Fuel Efficiency: Reduced gas mileage and increased fuel consumption.</li>
<li>Transmission Shifting Issues: Irregular or harsh shifting in automatic transmissions.</li>
<li>Limp Mode: The vehicle's computer may limit power and speed to protect the engine.</li>
</ul>
<h2>How to fix a throttle position sensor?</h2>
Fixing a faulty TPS often involves either cleaning the sensor or replacing it, depending on the severity of the problem.
<h3>Cleaning the TPS:</h3>
<ul>
<li>Disconnect the battery.</li>
<li>Locate and remove the TPS.</li>
<li>Clean it with an electronic contact cleaner.</li>
<li>Reinstall the TPS, reconnect, and reconnect the battery.</li>
</ul>
<h3>Replacing the TPS:</h3>
<ul>
<li>Disconnect the battery.</li>
<li>Remove the old TPS.</li>
<li>Get a matching replacement TPS.</li>
<li>Install the new TPS, reconnect, and reconnect the battery.</li>
<li>Calibrate if needed.</li>
<li>Test the vehicle for issues. If problems persist, consult a mechanic.</li>
</ul>

Throttle Position Sensor

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Air Filter Box

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Air Flow Sensor

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Air Intake Duct

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Air Intake Hose

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Air Intake Manifold Actuator Control Solenoid

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Air Intake Manifold Flap Adjuster

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Air Intake Manifold Runner Control Sensor

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Electric Vacuum Pump

Engine Air Duct Assembly

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Engine Air Filter

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Intake Manifold

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Intake Manifold Flap Actuator

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Intercooler

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Oxygen Sensor

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Pressure Sensor

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Throttle Body

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Turbocharger

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Turbocharger Oil Line

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Vacuum Pump

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Camshaft Timing Gear

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Camshafts

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Engine Valve Cover

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Harmonic Balancer

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Timing Belt Kit

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Timing Chain Kit

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Timing Cover

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Timing-Control Valve Solenoid

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Valve Lifters Tappet

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Cams, Timing & Valvetrain

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Belt Tensioner

Coolant Level Sensor

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Crankcase Breather Valve

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Crankshaft Position Sensor

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Engine Oil Dipstick Tube

Engine Oil Filter

Engine Oil Pan Gasket

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Flywheel

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Oil Cooler

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Oil Cooler Line

Oil Filler Cap

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Oil Filter

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Oil Filter Housing

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Oil Level Sensor

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Oil Pan

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Oil Pump

Oil Pump Drive Gear Shaft

Oil Pump Pickup Tube

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Cranks, Pistons, Oil & Components

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Camshaft Position Sensor

Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

Engine Valve Covers & Ignition Coils Kits

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Ignition Coil

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Ignition Coils & Spark Plugs Kits

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Ignition Distributor

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Ignition Starter Switch

Ignition Switch Actuator

Knock Detonation Sensor

Relay

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Spark Plug

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Spark Plug Wire

Electronic Control Modules, Ignition & Distributors

Engine Wiring Harness

Intake Manifold Repair Kit

Engine Components & Accessories

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Auxiliary Water Pump

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Expansion Tank

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Expansion Tank Mounting Plate

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Fuel Cooler

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Radiator

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Radiator Hose

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Radiator Support Assembly

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Temperature Sensor

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Turbo Hose

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Water Coolant Pipe

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Water Outlet

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Engine Cooling

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Engine Mount

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Engine Mounts

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Catalytic Converter

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EGR Valve

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Exhaust Fluid Heater

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Exhaust Gas Temperature Sensor

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Exhaust Manifold

Fuel Tank Breather Valve

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Fuel Vapor Leak Detection Pump

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Nitrogen Oxide Sensor

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Secondary Air Injection Check Valve

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Vapor Canister Vent Solenoid

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Fuel Injection Pressure Regulator

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Fuel Injector

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Fuel Line Kit

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Fuel Pump

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Fuel Sending Unit

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High Pressure Fuel Pump

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Fuel Systems & Components

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The engine comprises many essential elements such as the lower cylinder block, upper cylinder head(s), and the cooling & lubricating systems. With A-Premium aftermarket engine components, you can expect that your engine deliver years of reliable performance. We offer a diverse selection of engine components from air filters and ignition coils (kits) to fuel pumps to cater to your needs.

Toyota Sienna Throttle Position Sensor