General signs
* Fluctuations in engine speed while driving
* Unusual gear changes (too early, too late)
* Vehicle jerks or slips when changing gears
* Slipping when accelerating
* Poor fuel consumption
Specific features for different types of speed sensors
Input Shaft Speed Sensor (VSS)
* Inaccurate or missing speedometer
* Fault codes indicating problems with VSS
Output Shaft Speed Sensor (OSS)
* Inaccurate or missing speedometer (especially at high speeds)
* Fault codes indicating problems with OSS
Turbine Speed Sensor (TSS)
* Slipping when accelerating
*Reduced engine power
* Increased transmission temperature
Other signs
* Check engine light on
* Fault codes indicating a transmission fault
* Difficulty when shifting gears into manual mode