Standard Ignition TH420 Throttle Position Sensor

Throttle Position Sensor for Dodge Ram Applications

Standard Ignition TH420 is a throttle position sensor built for precise throttle angle feedback in engine management systems. It is a direct-fit style replacement for select Dodge Ram 1500, Ram 2500, and Ram 3500 applications with a full bellcrank assembly, including 1998-2004 Dodge Ram 2500 and Ram 3500 models and 2003 Dodge Ram 1500.

Key Features

• Female connector with a plug-in design for straightforward electrical connection
• 6-pin male terminals for the specified throttle position sensor interface
• Sliding contact construction using multiple precious metal contacts on polymer thick film resistors
• Integral rotor bearings and return springs for easier installation than spring-less aftermarket designs
• Built to maintain reliable internal and external electrical connections
• End-of-line testing with thousands of data points to verify output voltage and linearity

Detailed Description

The Standard Ignition TH420 throttle position sensor is engineered to deliver consistent throttle signal feedback to the vehicle’s engine control system. Accurate throttle position input is critical for fuel delivery, shift behavior, and drivability, especially on Dodge Ram 1500, Ram 2500, and Ram 3500 trucks equipped with a full bellcrank assembly. This TH420 sensor uses a sliding contact design with precious metal contacts and polymer thick film resistors to support long service life and stable signal output.

Standard Ignition also incorporates integral rotor bearings and return springs, which helps simplify installation compared with spring-less aftermarket units that depend on worn throttle body components. The TH420 is a practical replacement choice when you need a throttle position sensor for 1998-2004 Dodge Ram 2500, 1998-2004 Dodge Ram 3500, or 2003 Dodge Ram 1500 applications. This part cross-references Walker Products 200-1340 for the same application.

Common Issues This Part Can Address

• Erratic or unstable throttle position signal output
• Throttle response concerns caused by a worn sensor
• Driveability problems related to inaccurate throttle angle feedback
• Check engine light conditions tied to throttle position sensor faults
• Signal inconsistency from worn internal sensor contacts

Installation Notes and Tips

• Verify the vehicle uses a full bellcrank assembly before ordering.
• Confirm the connector style matches the female plug-in, 6-pin terminal layout.
• Inspect the throttle linkage and related components for wear before installation.
• Clear diagnostic trouble codes after replacement and confirm throttle signal operation.
• Use the vehicle’s service information to confirm calibration and connector routing.

Quality Assurance

Standard Ignition manufactures this throttle position sensor with controlled internal and external connections and tests each unit at the end of the line to confirm voltage output and linearity specifications. Part number TH420 is built to meet the signal requirements expected by the engine management system in the listed Dodge Ram applications.