Spectra S10121 Engine Crankshaft Position Sensor

Engine Crankshaft Position Sensor for Toyota and Scion

The Spectra S10121 engine crankshaft position sensor monitors crankshaft speed and position to support ignition timing and engine RPM calculation. It is a direct-fit replacement for select Toyota Prius, Yaris, Echo, and Scion xA/xB applications where accurate crank signal input is required.

• Engine crankshaft position sensor for ignition timing and RPM signal input
• Direct replacement for select Toyota and Scion applications
• Supports engine speed monitoring and crankshaft position feedback
• Helps eliminate the need for manual distributor timing on equipped engines
• Cross-references Standard Ignition PC271 and Delphi SS10254 for the same application

Detailed Product Information

Built for vehicles that rely on electronic engine management, the Spectra S10121 crankshaft position sensor provides the signal the engine control system uses to determine crankshaft position and rotational speed. That information is critical for ignition timing and stable engine operation. This part number, S10121, is listed for 2000-2005 Toyota Echo, 2001-2009 Toyota Prius, 2006-2018 Toyota Yaris, 2012-2021 Toyota Prius C, 2004-2006 Scion xA, and 2004-2006 Scion xB.

Compatible With 2000-2005 Toyota Echo, 2001-2009 Toyota Prius, 2006-2018 Toyota Yaris, 2012-2021 Toyota Prius C, 2004-2006 Scion xA, and 2004-2006 Scion xB. The Spectra S10121 is a practical OE-style replacement when the original crank signal becomes inconsistent or fails entirely.

Common Issues This Sensor Can Address

• Hard starting or no-start conditions related to crank signal loss
• Intermittent stalling caused by incorrect engine speed input
• Rough running from unstable ignition timing data
• Check engine light concerns tied to crankshaft position sensor faults
• Erratic RPM readings on the instrument cluster or scan tool

Installation Notes and Tips

Verify the connector style and mounting location against the original sensor before installation. Inspect the harness, connector terminals, and nearby wiring for damage or corrosion, since signal issues are not always caused by the sensor alone. Clear diagnostic trouble codes after installation and confirm proper engine operation.

Quality Assurance

Spectra manufactures replacement sensors for ignition and engine management applications, with coverage for a wide range of Toyota and Scion models. Part number S10121 is built to serve the crankshaft position sensing function required by the vehicle’s engine control system.