Speed / Reference / Knock Sensors

OE Match crankshaft pulse sender, reference 94460611500, for selected Porsche 911, 924S, 928, 944 and 968 applications. Catalogued against the relevant Porsche reference, this engine electrical sensor is intended for installation in the specified DME engine-management systems.

What This Product Does

The pulse sender monitors crankshaft rotation and provides the engine control unit with the reference information needed to determine engine speed or position. Depending on the vehicle’s DME configuration, this signal supports the accurate control of ignition timing and fuel injection.

Functions

• Detects crankshaft rotation or a defined reference point
• Transmits an electrical pulse signal to the DME control unit
• Supports calculation of engine speed and crankshaft position
• Provides timing information for ignition and fuel-injection control
• Helps the engine-management system recognise that the engine is cranking

Technical Details

• Part reference: 94460611500
• Component descriptions: pulse sender, crankshaft position sensor, crank-angle sensor and speed reference sensor
• Earlier cross-references: 94460601500 and 94460601700
• The Porsche 944 and 924S engine-electrics catalogues specify two senders for applicable installations
• The Porsche 968 1992–1995 engine-electrics diagram specifies one pulse sender
• Quantity and sensor function vary by engine-management arrangement; confirm the vehicle specification before ordering

Symptoms of Fault

• Engine cranks but does not start
• Intermittent starting difficulty, particularly when the engine is hot
• Sudden stalling or cutting out while running
• Misfires, hesitation or an uneven idle caused by an unstable signal
• Tachometer signal dropping unexpectedly on applicable vehicles
• Stored crankshaft, reference-signal or engine-speed fault information
• Cracked cable insulation, heat damage or corrosion at the connector

Why Replacement Matters

A weak or missing pulse signal can prevent the DME from establishing the correct crankshaft reference. This may interrupt ignition and injection control, resulting in intermittent running faults or a complete no-start condition. Before replacing the sender, inspect its wiring, connector, mounting, sensor gap where applicable, battery condition and engine earth connections. Testing the signal during cranking can help distinguish a defective sender from a wiring or control-unit fault.

Fits

• Porsche 911 & 912 (1965–1989): 911 3.3L Turbo (930) 1978–1989; 911 3.2L 1984–1986; 911 3.2L G50 1987–1989
• Porsche 924 (1977–1988): 924S 2.5L 1986–1987; 924S 2.5L 1988
• Porsche 928 (1978–1995): 928 4.5L 1978–1982; 928S 4.7L 1981–1983; 928S2 4.7L 1984–1986; 928S4 5.0L 1987–1992; 928GT 5.0L 1989–1991; 928GTS 5.4L 1992–1995
• Porsche 944 (1982–1991): 944 2.5L 8V 1982–1987; 944 2.7L 8V 1988–1989; 944S 2.5L 16V 1987–1988; 944S2 3.0L 16V 1989–1991; 944 Turbo 2.5L 8V 1985–1988; 944 Turbo 2.5L 8V 1989–1991; 944 Turbo S 2.5L 8V 1988
• Porsche 968 (1992–1995): 968 3.0L 1992–1994; 968 Sport 3.0L 1994–1995; 968 CS 3.0L 1993–1995; 968 Turbo S 3.0L 1993–1994

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

FAQs

• Why can a failed reference sender cause a no-start?
  Without a valid crankshaft signal, the DME may be unable to time the ignition and fuel-injection events.
• Why might the fault be intermittent?
  Heat, vibration, ageing insulation or an internal electrical fault can cause the signal to disappear only under certain conditions.
• Should the sensor be replaced from a fault code alone?
  No. Inspect the connector and wiring, verify power and earth conditions, and test the sender signal where suitable diagnostic equipment is available.
• How many senders are required?
  The required quantity depends on the Porsche model and engine-management arrangement. Some 924S and 944 applications use two, while the supplied 968 diagram identifies one.
• Does installation clearance matter?
  Yes. The sensor must be correctly mounted, and the specified gap should be verified where the application uses an adjustable mounting arrangement.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

94460611500

The product you are viewing cross references to these numbers

Dead centre sensor.
Sensor for upper dead centre



Fits:
Porsche 911 1984-89
Porsche 924S 1986-88
Porsche 944 1984-91

Click 'Zoom in' for large parts diagram.
Diagram ref no 24

Related reference numbers
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91160610800

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Dual crankshaft and camshaft position sensor for electronic fuel injection upgrade. Porsche 911 1974 to 1989
Dual sensor kit with pulley is the complete engine position monitoring kit

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50

The dual sensor unit, no pulley is for people who might be upgrading from another crank sensor kit, and have a trigger installed. So long as the trigger wheel diameter is between 127mm and 132mm in diameter, then our kit can most likely be used with the existing trigger wheel.

Dual sensor 
Trigger every 720 degrees (compression stroke)
36 tooth trigger wheel

Dual sensor – This unit has the same sensor as the in the body as the single sensor, but a second sensor that points at the trigger disc mounted to the Adapt Motorsport crank pulley. As standard, this is a 36-1 pulley, meaning that it has 36 teeth, minus 1 missing tooth. This allows the ECU to know what the crankshaft position is at all times and in combination with the internal sensor, whether it is on the compression or exhaust stroke in its 720 degree cycle. This system provides a complete engine position sensing kit. If you have an existing 36t trigger disc, it is possible to use our sensor kit on this, provided that the teeth are designed for a hall sensor, and not a magnetic sensor, and the outside diameter of the teeth is between 127 and 

130mm. Please contact us for clarification

Why do you need this system and what are crankshaft/camshaft position sensors? 

When converting classic Porsches to modern electronic fuel injection, the engine control unit (ECU) needs to know exactly where the crankshaft and camshafts are in there 4 stroke cycle and how fast they are spinning.  This allows the ECU to correctly time each spark and fuel injector opening time and duration.  The first sensor is pointed at the crankshaft pulley and measures a pulse for every tooth.  There is one missing tooth and from this the ECU can work out what the crankshaft position is relative to this missing tooth.  The time between pulses gives the engine speed and rate of change.  

But there is a problem, the engine spins two complete revolutions to complete its 4 stroke cycle.  So whilst with this one sensor, the ECU knows where it is relative to top dead centre (TDC), it does not know if it is on the compression or exhaust stroke.  This is where the second reference sensor comes in.  This sensor is installed in the body our module, and measures a single tooth.  As this is installed in the distributor hole, this is geared to run at half engine speed, so will produce a pulse once every 720 degrees.  With these two sensors, the ECU knows the exact position the engine is in its 4 stroke cycle.  And now, we can run accurate sequential injection and ignition.

Our kit uses high speed digital hall effect sensors for a digital output to the engine control unit, these are best run at 8V, most modern ECU's have an 8V output dedicated for crankshaft sensors.

Machined aluminium housing and anodised finish, complete with maintenance free bronze bush and sealed for life roller bearing.  These sensors are quite adjustable so are often able to be used with existing crank pully and trigger wheel setups from other quality vendors.

Sync 2 Kit Includes:
Main body assembly
ZF Hall effect sensors x 2
Wiring and connectors, with pins and connectors for connecting to your wiring loom.

For use with other crank trigger systems.
(We can not guarantee that that this system will fit every crank/trigger system, however it can be easily modified to suit most systems)

This replacement kit fits to the OEM distributor location using your own factory distributor gear. Simply remove the factory distributor gear from your install the gear, wire to your ECU, fine tune the sensor air gap to the crank trigger disc, setup the reference position in the ECU and you have all the sensing you need for the latest sequential fuel and ignition systems.  This kit works on the 2.7lre, 3.0ltr and with the turbo distributor gears.

Please Note
2.7 engines may need to trim some of the crank case near the crank pulley to prevent interference.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

93060250052

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Impulse / speed reference sensor.  Please note there are 2 per car (Price is Each)



Fits:
Porsche 911 1984-89

Related reference numbers
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91160621502

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Impulse / speed reference sensor - also known are Engine Crankshaft Position Sensor
Please note there are 2 per car, Price is Each

Fits:
Porsche 911 1984-1986 3.2L
Porsche 911 1987-1989 3.2L G50
Porsche 911 1978-1989 3.3L Turbo (930)

The engine crankshaft position sensor (CPS) is a critical component that monitors the crankshaft’s position and rotational speed. It sends this data to the engine control unit (ECU), allowing precise control of fuel injection, ignition timing, and other key engine functions. Without accurate input from the CPS, the ECU cannot properly synchronize spark or fuel delivery—leading to poor performance or even a no-start condition.

Crankshaft sensors typically use magnetic or Hall-effect technology:
Magnetic sensors generate a signal with a coil and magnet as the crankshaft rotates. Hall-effect sensors detect changes in the magnetic field using a semiconductor for highly accurate readings.
Depending on the engine design, the CPS is usually located near the crankshaft pulley, harmonic balancer, flywheel, or transmission. It reads notches or teeth on a tone wheel to create a signal the ECU can interpret.
Over time, heat, vibration, and contaminants (oil, dirt, or metal shavings) can cause the sensor to fail. When this happens, common symptoms include engine stalling, rough idling, misfires, or a no-start condition.

Common Symptoms of a Failing Crankshaft Position Sensor
No Start Condition – If the ECU doesn’t receive a proper signal, the engine won’t start.
Stalling When Warm – The sensor may fail when the engine reaches operating temperature, causing unexpected stalling.
Erratic or Dead Tachometer – In some vehicles, a faulty CPS can cause the tachometer to behave irregularly.
Check Engine Code P0335 – A failed internal circuit may trigger this code, though not always.
Poor Performance at Certain RPMs – Timing issues can cause hesitation, especially at idle or higher RPMs.
Multiple Cylinder Misfires – Unlike a single bad coil or injector, CPS failure can cause misfires across all cylinders.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91160621502

The product you are viewing cross references to these numbers

Single camshaft position sensor for sequential ignition / injection upgrade. 
The single sensor unit is for cars that already have a separate crankshaft sensor, either on the flywheel, or an existing crank pulley sensor

Fits:
Porsche 911 2.7 - 1974 to 1978 (CIS injection)
Porsche 911 SC 3.0ltr - 1978 to 1983
Porsche 911 3.2 Carrera - 1984 to 1989

Does not work with 964 and 993 engines

Single sensor – This unit has a singe sensor inside the body that detects one single tooth. This shaft rotates at half engine speed, so this sensor picks up once every 720 degrees. This is used to tell the ECU when it is on the compression stroke. The single sensor version needs to be used in conjunction with an existing crank position sensor, either on the pulley, or on the flywheel as common on the 964/993 or cars that have had their flywheel machined for a sensor pickup

Why do you need this system and what is a crankshaft position sensor? 

When converting classic Porsches to modern electronic fuel injection, the engine control unit (ECU) needs to know exactly where the crankshaft and camshaft is in its 4 stroke cycle and how fast they are spinning.  This allows the ECU to correctly time each spark and fuel injector opening time and duration. A sensor is pointed at the crankshaft pulley or flywheel and measures a pulse for every tooth.  There is one missing tooth and from this the ECU can work out what the crankshaft position is relative to this missing tooth. The time between pulses gives the engine speed and rate of change.  

The 3.2 Carrera already has a sensor on the flywheel to measure crankshaft position so these engines only require one senor for camshaft positioning. This sensor is installed in the body our module, and measures a single tooth at the top of the drive shaft.  As this is installed in the distributor hole, this is geared to run at half engine speed, so will produce a pulse once every 720 degrees.  With these two sensors, the ECU knows the exact position the engine is in its 4 stroke cycle.  And now, we can run accurate sequential injection and ignition.

Our kit uses high speed digital hall effect sensors for a digital output to the engine control unit, these are best run at 8V, most modern ECU's have an 8V output dedicated for crankshaft sensors.

Machined aluminium housing and anodised finish, complete with maintenance free bronze bush and sealed for life roller bearing.  These sensors are quite adjustable so are often able to be used with existing crank pully and trigger wheel setups from other quality vendors.

Sync 1 Sensor Kit Includes:

• Main body assembly
• ZF Hall effect sensors, single tooth for engine cycle sensing x 1
• Wiring and connectors, with pins and connectors for connecting to your wiring loom.

For use when you already have some other crankshaft position sensing either on the flywheel or pulley and just need to add an engine cycle/sync sensor to complete your sequential system.

This replacement kit fits to the OEM distributor location using your own factory distributor gear. Simply remove the factory distributor gear from your install the gear, wire to your ECU, fine tune the sensor air gap to the crank trigger disc, setup the reference position in the ECU and you have all the sensing you need for the latest sequential fuel and ignition systems.  This kit works on the  964, 993 and with the turbo distributor gears.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

93060250052

The product you are viewing cross references to these numbers

Genuine Porsche G50 gearbox speed sensor for the 911 Carrera 3.2L and 930 Turbo 3.3L applications listed below. This pulse sender forms part of the vehicle's speedometer system.

Fits

• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1978-1989 3.3L Turbo (930)

What This Product Does

The sender supplies the electrical speed signal used by the speedometer. It is a gearbox-related vehicle-speed component, rather than an engine reference or knock sensor; those components perform different monitoring tasks.

Functions

• Provides a pulse signal for vehicle-speed indication.
• Connects gearbox speed sensing with the speedometer system.

Technical Details

• Brand: Genuine Porsche.
• Application: G50 gearbox speed sensing.
• Supplied part references: 91160691001 and 91160691002.

Symptoms of Fault

Intermittent electrical behaviour, damaged cable insulation or corroded connections warrant investigation. Inspect the sender wiring and connectors before attributing a speedometer problem to the sensor itself.

Why Replacement Matters

A confirmed sender fault can interrupt the speed signal. Replacement addresses the defective component, but damaged wiring or poor connections must also be corrected. Matching the part to the specific G50 installation helps avoid compatibility problems.

FAQs

• Is this an engine-speed sensor?
  No. The supplied diagram identifies it as a pulse sender within the speedometer assembly.
• Does the Turbo listing cover every model year?
  The supplied fitment lists 1978-1989, while the diagram specifies 89- for this Turbo sender. Confirm the exact gearbox application before ordering.
• Should the sensor be replaced without testing?
  Check the wiring, connections and signal first. Similar electrical symptoms can have more than one cause.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91160691002

The product you are viewing cross references to these numbers

Speed Sensor - G50 Gearbox 

Restore accurate vehicle speed measurement and reliable speedometer operation with this OE Match Speed Sensor for Porsche 911 Carrera models equipped with the G50 gearbox from 1987-1989 and 1989 Porsche 911 turbo models. 

Fits:

• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1978-1989 3.3L Turbo (930)

Mounted on the G50 transmission, the speed sensor monitors gearbox output shaft rotation and generates an electronic signal that is used by the vehicle's speedometer and associated control systems. As one of the key components within the vehicle speed monitoring system, a correctly functioning speed sensor is essential for accurate speed indication and proper operation of related electrical systems.

Manufactured to OE specifications, this direct replacement sensor provides dependable performance and factory-correct fitment for maintenance, fault diagnosis and restoration projects.

What Does the G50 Speed Sensor Do?

The speed sensor measures the rotational speed of the gearbox output shaft and converts this information into an electrical signal.

Its primary functions include:

• Monitoring vehicle road speed
• Operating the speedometer
• Providing vehicle speed information
• Supporting odometer functionality
• Assisting vehicle electrical systems
• Delivering accurate speed readings
• Maintaining factory instrumentation performance

Without a functioning speed sensor, the vehicle's speed indication system cannot operate correctly.

Why Do Speed Sensors Fail?

Speed sensors are exposed to heat, vibration, moisture and years of continuous operation.

Common causes of failure include:

• Internal electronic deterioration
• Heat-related ageing
• Wiring damage
• Corrosion of terminals
• Moisture ingress
• Gearbox contamination
• Physical impact damage
• Age-related component failure

As the sensor ages, signal quality can deteriorate, eventually leading to inaccurate readings or complete failure.

Symptoms of a Faulty Speed Sensor

Common warning signs include:

• Inoperative speedometer
• Erratic speedometer readings
• Intermittent speed display
• Odometer malfunction
• Speedometer needle fluctuation
• Electrical fault diagnosis issues
• Loss of vehicle speed signal
• Dashboard instrumentation faults

In many cases, the speedometer may work intermittently before complete sensor failure occurs.

When Should the Speed Sensor Be Replaced?

Replacement is recommended when:
Diagnosing speedometer faults
Speed readings become erratic
The speedometer stops working
Replacing damaged wiring
Carrying out gearbox repairs
Performing preventative maintenance
Restoring a Porsche 911 or 911 turbo
Electrical testing confirms sensor failure

Many Porsche specialists replace ageing sensors when undertaking transmission refurbishment work.

Why Replacement Matters

A functioning speed sensor is important for both safety and vehicle usability.

Benefits of replacement include:

• Accurate speedometer readings
• Reliable odometer operation
• Improved electrical system functionality
• Elimination of intermittent faults
• Enhanced driving confidence
• Reliable vehicle speed monitoring
• Improved restoration quality
• Factory-correct performance

For classic G50-equipped Porsche models, maintaining reliable instrumentation is an important part of preserving the driving experience.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91160691002

The product you are viewing cross references to these numbers

Tensioner spring for speedometer impulse sender.

Fits:
Porsche 911 1974-77 - Models with electronic speedometer.
Porsche 911 1978-89 
Porsche 911 Turbo (930) 1975-77 
Porsche 928 1078-91

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91566050901

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