Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Output Shaft Speed Sensor
Output Shaft Speed (OSS) sensor provides PCM with information about rotational speed of transmission output shaft. PCM uses information to control and diagnose powertrain behavior. In some applications, OSS sensor is also used as source of monitoring vehicle speed. OSS sensor may be physically located in different places on vehicle, depending upon the specific application. Design of each OSS sensor is unique and depends on which powertrain control feature uses the information generated.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.