Crankshaft position / speed sensor. Porsche 986 Boxster / 987 Boxster / 987C Cayman / 996 / 997.1  ›  98660611204

OE Match crankshaft position / speed sensor for selected Porsche 986 and 987 Boxster, 987C Cayman, 996 and 997 models. Turbo applications include the supplied Tiptronic transmission restrictions below.

Fits

• Porsche 986 Boxster 2003-04
  
• Porsche 987 Boxster 2005-08
  
• Porsche 987C Cayman 2005-08
  
• Porsche 996 Carrera 2003>>
  
• Porsche 996 Turbo (Tiptronic Transmission)
  
• 996 GT2 2001–05
• Porsche 997 Carrera 2005-08
  
• Porsche 997 Turbo 2007>> (Tiptronic Transmission)
  
  

Check fitment for your specific vehicle (model, year, engine) before ordering. 

Diagram reference number 31

What This Product Does

The crankshaft sender supplies engine rotation and position information to the engine control unit. This timing reference is used to coordinate ignition and fuel injection; it is not a wheel-speed or knock sensor.

Functions

• Reports crankshaft rotational speed.
• Provides the engine position reference used for ignition and injection timing.
  
  

Technical Details

• Product reference: 98660611204. Supplied diagrams also identify pulse sender 98660611203.
  
  

Symptoms of Fault

• Occasional failure to start, including after heat soak.
• Engine stopping unexpectedly or stalling when hot.
• Misfiring, uneven idle or hesitation.
• Engine warning light or crankshaft-reference fault information.
• Unstable engine-speed readings during diagnosis.
  
  

Why Replacement Matters

A confirmed sender fault can interrupt the timing information needed for engine operation. Replacing the faulty component addresses that signal source, but damaged wiring or corroded connections can produce similar symptoms and should be checked first.

FAQs

Does a fault code prove the sensor needs replacing?
No. Inspect the connector and wiring, then verify the signal before deciding which component requires renewal.

Why can the fault disappear after cooling?
Temperature changes and vibration can affect weakened wiring or internal sensor components, making the problem intermittent.

What should be checked before installation?
Match the original reference, vehicle production details, transmission application and connector. Follow the vehicle-specific fitting procedure.