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Sensors

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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.



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91160691001
91160691001
313 09 585
494330090

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91566050901
Product Information
Product Information
Tensioner spring for speedometer impulse sender.


porsche

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



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Related, superseded, cross reference or alternative numbers for comparison.

91566050901
91566050900

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About Sensors

Porsche Gearbox & Transmission Sensors | Precision Monitoring for Smooth Shifting & Performance

Transmission sensors play a critical role in monitoring, controlling, and optimising your Porsche’s gearbox operation. They measure vital parameters such as gear position, speed, oil temperature, and pressure — ensuring the transmission control unit (TCU) delivers smooth, precise, and responsive gear changes.

At Design911, we supply high-quality gearbox and transmission sensors designed to meet or exceed original performance specifications. Each sensor is manufactured using advanced electronic components and durable housings to provide accurate readings, reliability, and long service life under all driving conditions.

Whether you’re diagnosing a shifting fault, replacing a worn sensor, or performing a transmission rebuild, our Porsche transmission sensors deliver the precision and dependability your performance car demands.

What Do Gearbox / Transmission Sensors Do?

Transmission sensors collect and relay real-time data to your Porsche’s control unit, which adjusts hydraulic pressure, shift timing, and clutch engagement based on driving conditions.

Core Functions:

  • Monitor input and output shaft speeds for precise gear control.
  • Detect gear position and selector status.
  • Measure oil temperature and pressure to protect internal components.
  • Enable adaptive gear shifting and torque distribution.
  • Support transmission diagnostics and safety functions.

Without accurate sensor feedback, the gearbox cannot manage shifts efficiently, leading to jerky changes, fault codes, or even transmission limp mode.

Why Do Transmission Sensors Fail or Malfunction?

Over time, sensors are exposed to high heat, vibration, and contamination — conditions that can degrade their performance or cause complete failure.

Common Causes of Failure Include:

  • Oil contamination or debris buildup on sensor contacts.
  • Electrical short circuits or wiring damage.
  • Internal corrosion from moisture ingress.
  • Excessive heat or vibration weakening electronic components.
  • Sensor misalignment or connector failure.

When gearbox sensors fail, symptoms may include erratic shifting, warning lights, transmission errors, or the vehicle entering limp mode to protect itself from damage.

Why Replace Your Porsche Gearbox / Transmission Sensors?

Replacing worn or faulty sensors restores precise gearbox communication, smooth shifting, and consistent performance. High-quality replacement sensors also improve diagnostic accuracy and ensure reliable integration with your vehicle’s control systems.

Key Benefits:

  • Restores smooth, consistent gear shifting.
  • Eliminates transmission error codes and warning lights.
  • Improves fuel efficiency and torque delivery.
  • Prevents transmission damage from incorrect data signals.
  • Compatible with manual, Tiptronic, and PDK Porsche gearboxes.
  • Easy-fit replacement for maintenance, servicing, or rebuilds.

Regular sensor maintenance and timely replacement are essential for maintaining transmission reliability, especially in performance or high-mileage Porsches.

Highlights

  • Precision-engineered Porsche gearbox and transmission sensors.
  • Accurate readings for pressure, speed, temperature, and position.
  • Designed for durability under heat, vibration, and oil exposure.
  • Suitable for Porsche 911, Cayman, Boxster, Panamera, and more.
  • Direct-fit replacements to restore communication and performance.
  • Essential for smooth, efficient, and adaptive gear control.       

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