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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>

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Lexus SC430 Throttle Position Sensor