Throttle Position Sensor - OEM 3140173 (22mm) / 3131705 (26mm)

A Throttle Position Sensor, Available in Two Sizes

This is a replacement throttle position sensor, available in two OEM specifications — part number 3140173 in a 22mm size and part number 3131705 in a 26mm size. If your engine has developed a rough idle, hesitation on acceleration, or an intermittent check engine light related to throttle input, a worn or drifting throttle position sensor is a common and relatively inexpensive cause worth ruling out.

What a Throttle Position Sensor Does

The throttle position sensor tells your engine's computer exactly how far the throttle plate is open at any given moment, which the computer uses alongside other sensor data to calculate how much fuel to inject and how to time ignition. It's a small potentiometer or hall-effect sensor mounted on the throttle body, and it needs to report a smooth, accurate voltage across the full range of throttle movement for the engine to run correctly. When the sensor wears internally or the signal starts to drift, the computer gets bad information and compensates poorly, which is where the symptoms below come from.

Signs Yours Might Be Failing

A failing throttle position sensor often shows up as a rough or fluctuating idle, hesitation or a flat spot when you press the accelerator, unexpected surges in RPM without any change in pedal input, or a check engine light referencing throttle position or a related fault code. Some vehicles will also enter a reduced-power "limp" mode if the computer decides the sensor data is unreliable enough to be unsafe to use normally. None of these symptoms are exclusive to a bad TPS — a dirty throttle body or a vacuum leak can cause similar issues — so it's worth confirming with a code reader or a multimeter check on the sensor's voltage output before assuming this is the fix you need.

Two Sizes, Two Part Numbers

This listing covers two OEM specifications: part number 3140173, sized at 22mm, and part number 3131705, sized at 26mm. These aren't interchangeable with each other — the sensor has to physically match your throttle body's mounting bore, so check which size and part number matches your vehicle's original sensor before ordering rather than guessing based on engine size or make alone.

A Note on Compatibility

We don't have a specific vehicle application list on file for either size beyond the OEM part numbers themselves, so we're not going to claim broad compatibility we can't confirm. The safest way to order the correct one is to match either 3140173 or 3131705 directly against the number stamped on your current sensor, or against your vehicle's parts catalog. If you're not sure which one you need, reach out through our Request a Part page with your vehicle details and we'll help you confirm.

Installation Notes

Replacing a throttle position sensor is typically a straightforward job — it's usually held on with two small screws on the throttle body and connects through a simple electrical plug. Once replaced, some vehicles require the engine computer to relearn the throttle's idle position, which can happen automatically after a short drive cycle or may need a manual reset procedure depending on your specific make and model — it's worth checking your vehicle's service information for that detail before assuming the job is finished at the last bolt.

Specifications

• Type: Throttle position sensor
• OEM part number: 3140173 (22mm)
• OEM part number: 3131705 (26mm)
• Measurement range: Standard
• Condition: New

For more on how these sensors work alongside the rest of the engine management system, Wikipedia's throttle position sensor article covers the sensor technology and signal types in more technical depth.

Ordering Information

This throttle position sensor is in stock in both sizes and ships ready to install. Our Shipping Information page covers current timelines, and our Warranty and Returns pages explain what to do if the size you ordered turns out to be wrong.

Related Parts

This sensor sits in our sensors and electronics collection and our electrical parts collection. If you're diagnosing a throttle or idle issue and aren't yet certain the TPS is the cause, it's worth browsing those collections for other related sensors.