Standard Ignition TH391 Throttle Position Sensor

Reliable Throttle Position Sensor for Lexus and Toyota Vehicles

The Standard Ignition TH391 throttle position sensor is designed to provide accurate throttle position readings for a range of Lexus and Toyota models. This sensor helps maintain optimal engine performance and fuel efficiency by delivering precise data to the vehicle's engine control unit.

• Compatible with Lexus and Toyota models including Camry, ES300, GS300, GS430, IS300, LS430, LX470, Prius, SC300, SC400, SC430, and Sequoia
• OEM-quality replacement part ensuring reliable throttle position measurement
• Part number TH391 for easy identification and fitment verification
• Direct fit sensor designed to meet factory specifications
• Supports emission control system functionality

Product Details and Compatibility

The Standard Ignition TH391 throttle position sensor is engineered to match the original equipment specifications for a variety of Lexus and Toyota vehicles. It accurately monitors the position of the throttle valve, sending real-time data to the engine control module to regulate fuel injection and ignition timing. This sensor is essential for maintaining smooth acceleration, proper idle speed, and overall engine responsiveness. Compatible with popular models such as the Toyota Camry and Prius, as well as Lexus models including the GS300, LS430, and LX470, this sensor ensures consistent performance across multiple vehicle platforms.

Common Applications and Issues Addressed

• Resolves erratic idle or stalling problems caused by faulty throttle position readings
• Improves throttle response and acceleration consistency
• Helps correct engine hesitation or surging during acceleration
• Supports emission control by providing accurate throttle data
• Prevents check engine light triggers related to throttle position sensor faults

Installation Notes and Tips

Installation of the Standard Ignition TH391 throttle position sensor requires basic automotive tools and mechanical knowledge. Before installation, ensure the vehicle's battery is disconnected to prevent electrical shorts. Remove the old sensor carefully to avoid damaging the throttle body. Align the new sensor properly and secure it with the original mounting hardware. After installation, it is recommended to clear any diagnostic trouble codes and perform a throttle position sensor calibration if required by the vehicle's service manual.

Quality Assurance and Warranty

Standard Ignition parts are manufactured to meet or exceed OEM standards, providing dependable performance and durability. The TH391 throttle position sensor undergoes rigorous quality control testing to ensure consistent operation. While specific warranty details may vary, Standard Ignition typically offers a limited warranty covering defects in material and workmanship to provide confidence in the product's reliability.