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Engine crankshaft position sensor. Also known as "Reference Mark Sensor" or "Pulse Sender". If your Porsche is experiencing starting issues such as difficulty starting when hot etc this might be the culprit. 

NoteModels which have the original rectangular plug must be updated using the following:

1x 999-652-916-40 oval plug housing
3x 999-652-871-22 connectors
3x 999-704-161-40 grommets

Reference Part Number:
 996-606-105-00
Supersedes Part Number(s): 911-606-217-03, 993-606-217-01
Manufacturer: BOSCH (OEM)
Manufacturer Part Number: 0-261-210-205

Vehicle Fitment

Model Engine Years Fuel System Option Qty Required Comments
911 Carrera 4 3.6 1990-1994 FI
1
911 Carrera 2 3.6 1990-1994 FI
1
911 Turbo 3.3 1991-1992 FI
1
911 Turbo 3.6 3.6 1993-1994 FI
1
911 RS America 3.6 1993-1994 FI
1
911 Speedster
3.6 1994 FI
1
993 Carrera 3.6 1995-1998 FI
1
993 Carrera 4 3.6 1995-1998 FI
1
993 Carrera 4S 3.6 1996-1998 FI
1
993 Turbo 3.6 1996-1997 FI
1
993 Carrera S 3.6 1998 FI
1
996 Turbo 3.6 2001-2005 FI
1 Manual Transmission
996 GT2 3.6 2002-2005 FI
1
996 Turbo S 3.6 2005 FI
1 Manual Transmission