The output speed sensor (often called the Vehicle Speed Sensor or OSS) on a 2013 Ford F-150 is mounted to the automatic transmission’s tail housing. It provides the signal used by the speedometer and the powertrain control module to gauge vehicle speed. In most 2013 F-150s, you’ll find it on the rear of the transmission, and it is accessible from underneath the vehicle. Different drivetrains may slightly affect accessibility, but this is the standard location you’ll want to check.
Understanding why the sensor location matters
Knowing the exact spot helps during diagnostics, maintenance, or replacement. A faulty OSS can throw off the speedometer, shift logic, and transmission behavior, so identifying the correct mounting point is the first step in a proper repair.
Where to locate the sensor on a 2013 F-150
Below is a practical guide to locating the output speed sensor. The steps assume a typical 2013 F-150 with an automatic transmission; variations can occur by trim or aftermarket modifications. Always ensure the vehicle is safely supported before going underneath.
Two-wheel-drive (2WD) models
Use this walkthrough to find and inspect the OSS on 2WD trucks. The list explains the general approach and what to look for.
- Park the truck on a level surface, engage the parking brake, and chock the wheels. If needed, raise the front or rear of the vehicle for clearance and secure it on jack stands.
- From beneath the vehicle, locate the transmission housing at the rear of the engine where the driveshaft attaches. The OSS is mounted on the tail housing, close to the output shaft.
- Look for a small sensor with a multi-pin electrical connector threaded into the transmission housing. It is usually aimed toward the rear, near the point where the driveshaft exits the transmission.
- Inspect the sensor and its connector for signs of damage, corrosion, oil grime, or a loose harness. A common issue is a loose or corroded connector rather than a failed sensor itself.
- If you can safely unplug the connector, inspect the pins for corrosion and ensure the seal is intact before reconnecting.
Conclusion: On 2WD models, the OSS sits on the tail housing of the automatic transmission, visible from beneath the vehicle near the output shaft. Access may require removing shielding or maneuvering around the exhaust components for a clear view.
Four-wheel-drive (4WD) models
For 4WD trucks, the same transmission-based sensor typically serves the speedometer, but access principles remain similar. Use this as a guide if you’re working from underneath a 4WD F-150.
- Follow the same initial steps as the 2WD model to locate the transmission tail housing from under the truck.
- Identify the OSS by its small size and multi-pin connector threaded into the tail housing near the output shaft. It will be in roughly the same position as on 2WD models.
- Inspect the connector and wiring for damage or looseness. If you find oil or grime buildup, clean carefully with an approved electrical contact cleaner before reconnecting.
- When replacing, use and torque the sensor to the manufacturer’s specification to avoid leaks or improper readings.
Conclusion: In most 2013 F-150s, the transmission tail housing is the correct target for the OSS, and 4WD configurations do not typically relocate the sensor. If access is blocked by components, consult the service manual for recommended removal steps.
What to check if the sensor is faulty
If you suspect the OSS is failing, perform these checks before replacement to confirm the Fault Code and readings. This helps avoid unnecessary part replacement.
- Check for oil or grime buildup around the sensor and its connector, which can cause signal dropout or intermittent readings.
- Inspect the wiring harness for cracks, bent pins, or corrosion at the connector. A damaged harness can mimic a faulty sensor.
- Use a scan tool to observe live VSS data and compare it to road speed or a known reference. Erratic or zero readings indicate a sensor or wiring issue.
- If replacing the sensor, ensure you have the correct part number for your 2013 F-150’s transmission (some models use different mounts or connectors).
Conclusion: Faulty OSS behavior commonly shows up as inaccurate or no speedometer readings, transmission shifting irregularities, or fault codes. A physical inspection of the connector and wiring is a practical first step before replacing the sensor.
Summary
The output speed sensor on a 2013 Ford F-150 is mounted to the transmission’s tail housing and is typically accessible from beneath the vehicle near the output shaft. Whether your truck is 2WD or 4WD, this is the primary location to inspect for speedometer and transmission-related symptoms. If you’re troubleshooting, start with a careful visual inspection of the sensor and its connector, then verify readings with a diagnostic tool before deciding on replacement. Always follow safety procedures when working under a vehicle.