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Porsche > 911 & 912 (1965-1989) > 911 1978-1989 3.3L Turbo (930) > Engine Electrical >

Speed / Reference / Knock Sensors

Speed / Reference / Knock Sensors

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DISPLAYING 1 to 8 (of 8 products)
Impulse / speed reference sensor kit. Porsche 911 1984-89 - 91160621501, 0261210005, 91160621500, 91160621502, 91160621503 - 911-606-215-01
2
Impulse / speed reference sensor kit. Porsche 911 1984-89
91160621502/2KIT
Product Information
Product Information
Impulse / speed reference sensor.  SET OF 2

also known are Engine Crankshaft Position Sensor

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.

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


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.


This crankshaft sensor is designed for Porsche 911 G models produced between 1984 and 1989. It serves as a pulse generator, transmitting engine speed data to the DME, and is a frequent culprit when the engine experiences irregular performance. 

Identified by the Bosch number ending in 005, this sensor was installed in pairs within the vehicle. A reliable and precise pulse generator is crucial for optimal engine electronics performance. 



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Related, superseded, cross reference or alternative numbers for comparison.

91160621502
91160621501
0261210005
91160621500
91160621502
91160621503

The product you are viewing cross references to these numbers
Electrical Plug Housing - Multiple Applications. Porsche 964/993/996 Carrera & Turbo & GT3 / 986 Boxster - 99965291640
2
Electrical Plug Housing - Multiple Applications. Porsche 964/993/996 Carrera & Turbo & GT3 / 986 Boxster
Special Order item
99965291640
Product Information
Product Information

Electrical plug housing - multiple applications (see below).

Porsche 986 Boxster 1997-04
- Camshaft position sensor
- Throttle valve
- Ignition coil

Porsche 996 Carrera & GT3 1998-05
- Ignition coil

Porsche 964/993 Carrera & Turbo 1994-98
- Crankshaft position sensor



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Related, superseded, cross reference or alternative numbers for comparison.

99965291640
99965291640

The product you are viewing cross references to these numbers
Electrical Plug Housing - Multiple Applications. Porsche 964/993/996 Carrera & Turbo & GT3 / 986 Boxster - 99965291640 - 1928402868
2
Electrical Plug Housing - Multiple Applications. Porsche 964/993/996 Carrera & Turbo & GT3 / 986 Boxster
99965291640/1
Product Information
Product Information

Electrical plug housing - multiple applications (see below).

Porsche 986 Boxster 1997-04
- Camshaft position sensor
- Throttle valve
- Ignition coil

Porsche 996 Carrera & GT3 1998-05
- Ignition coil

Porsche 964/993 Carrera & Turbo 1994-98
- Crankshaft position sensor



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

99965291640
99965291640

The product you are viewing cross references to these numbers
Impulse / speed reference sensor. Porsche 911 84-89 - 91160621501, 0261210005, 91160621500, 91160621502
2
Impulse / speed reference sensor. Porsche 911 84-89
Special Order item
91160621502
Product Information
Product Information
Impulse / speed reference sensor.  Please note there are 2 per car (Price is Each)

porsche

Fits:
Porsche 911 1984-89

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

91160621502
91160621501
0261210005
91160621500
91160621502

The product you are viewing cross references to these numbers
Impulse / speed reference sensor. Porsche 911 84-89 - 91160621501, 0261210005, 91160621500, 91160621502, 91160621503 - 911-606-215-01
1
Impulse / speed reference sensor. Porsche 911 84-89
91160621502/2
Product Information
Product Information
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
91160621501
0261210005
91160621500
91160621502
91160621503

The product you are viewing cross references to these numbers
Impulse / speed reference sensor. Porsche 928 / 944 / 924S / 968 - 94460611500, 0261210003, 18889
2
Impulse / speed reference sensor. Porsche 928 / 944 / 924S / 968
94460611500/2
Product Information
Product Information
Impulse / speed reference sensor.

oematch

Fits:
Porsche 928
Porsche 924S
Porsche 944
Porsche 968

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

94460611500
94460611500
0261210003
18889

The product you are viewing cross references to these numbers
Speed Sensor. Porsche 911 1985 onwards - 91160620901
1
Speed Sensor. Porsche 911 1985 onwards
Special Order item
91160620901
Product Information
Product Information
Speed Sensor on the gearbox

porsche

Fits:
Porsche 911 1985-86 3.2L
Porsche 911 Turbo 1985-88

915 Gearbox type

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

91160620901
91160620901

The product you are viewing cross references to these numbers
Speed sensor. Porsche 911 1987 onwards - 91160691001, 313 09 585, 494330090
2
Speed sensor. Porsche 911 1987 onwards
91160691001/1
Product Information
Product Information

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.

91160691001
91160691001
313 09 585
494330090

The product you are viewing cross references to these numbers
DISPLAYING 1 to 8 (of 8 products)
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About Speed / Reference / Knock Sensors

Speed, Reference & Knock Sensors – Precision Monitoring for Porsche Engine Performance

Speed, reference, and knock sensors are crucial components in your Porsche’s engine management system. They work together to provide the engine control unit (ECU) with accurate data about crankshaft position, engine speed, and vibration — allowing the system to adjust timing, fueling, and ignition for maximum performance and protection.

At Design911, we supply a comprehensive selection of genuine and high-quality sensors for all Porsche Models, including 911, Boxster, Cayman, Cayenne, Macan, and Panamera. Each sensor is engineered for precise signal output, reliability, and durability, ensuring consistent performance and optimal engine operation.

What Do Speed, Reference & Knock Sensors Do?

These sensors play distinct yet complementary roles in your Porsche’s electronic control system:

  • Speed Sensors: Measure rotational speed of the wheels or crankshaft to optimise traction, stability, and engine timing.
  • Reference Sensors: Provide accurate engine position data to control ignition timing and fuel injection.
  • Knock Sensors: Detect engine detonation (pinging) and send signals to the ECU to adjust ignition timing, preventing engine damage.

Together, they ensure your Porsche runs smoothly, efficiently, and safely under all driving conditions.

Why Do These Sensors Fail?

Due to exposure to heat, vibration, and contamination, these sensors can degrade over time. Common causes of failure include:

  • Heat damage from proximity to engine or exhaust components.
  • Wiring corrosion or connector oxidation reducing signal accuracy.
  • Mechanical wear on sensor tips or mounting points.
  • Contamination from oil, dirt, or debris interfering with readings.
  • Electrical interference or internal circuitry failure.

Typical symptoms of sensor failure include poor acceleration, engine misfires, erratic idle, loss of power, increased fuel consumption, or a check engine light.

Why Replace Faulty Sensors?

A failing sensor can lead to poor performance, reduced fuel efficiency, and even engine damage if left unchecked. Replacing worn or damaged sensors ensures the ECU receives accurate data, maintaining safe and efficient operation.

Benefits of replacement include:

  • Restored ignition timing and fuel efficiency.
  • Improved throttle response and smooth acceleration.
  • Protection against detonation and engine wear.
  • Reliable performance with manufacturer-quality precision.

All sensors in our range are designed with high-quality materials, advanced shielding, and precision calibration to deliver consistent readings and long-term reliability in demanding conditions.

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