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Sensors
Restore reliable automatic transmission operation with this Genuine Porsche Automatic Transmission Contact Sensor, manufactured to Porsche's original equipment specification and supplied under part number 171927145A. This precision-engineered sensor is designed to monitor and communicate the selector lever position to the transmission control system, ensuring accurate gear selection and the safe operation of the automatic transmission.
Fits:
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
Diagram Ref No 2
The contact sensor is an essential component within the gear selector mechanism, allowing the vehicle's electrical systems to recognise the selected gear position. Over time, the sensor can wear, become contaminated, or suffer electrical failure, leading to incorrect gear indication, starting issues, or erratic transmission behaviour. Replacing the contact sensor restores dependable communication between the gear selector and transmission system, helping to maintain smooth and reliable operation.
What This Product Does:
- Detects the position of the automatic transmission selector.
- Communicates gear selection to the vehicle's electrical systems.
- Supports accurate transmission operation.
- Helps ensure the engine only starts in the correct selector positions.
- Maintains correct gear indication.
- Restores reliable communication between the selector and transmission.
- Provides Genuine Porsche fit, quality, and performance.
Symptoms Of Wear Or Failure:
- Incorrect gear position displayed.
- Difficulty starting the vehicle in Park or Neutral.
- Intermittent starting issues.
- Erratic or inconsistent transmission behaviour.
- Gear selector position not recognised correctly.
- Electrical faults relating to the transmission selector.
- Visible corrosion or damage to the sensor.
- Age-related deterioration of the original component.
Why Replacement Matters:
- The automatic transmission contact sensor is a vital component that ensures the transmission control system accurately identifies the selected gear. A faulty sensor can affect starting safety, gear indication, and overall transmission performance, potentially leading to unreliable vehicle operation.
- Replacing a worn or faulty contact sensor restores accurate gear position detection, reliable transmission communication, and dependable starting functionality. As a Genuine Porsche replacement part, it provides the correct fit, precise operation, and long-term durability required to maintain the safety, reliability, and original performance of your Porsche's automatic transmission system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
171927145A
The product you are viewing cross references to these numbers
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
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12 Month Warranty
Worldwide Delivery
Restore reliable automatic transmission operation with this OE Match Automatic Transmission Contact Sensor, manufactured as a direct replacement. Produced to OE-style specifications, this high-quality sensor is designed to detect and communicate the selector lever position to the vehicle's transmission control system, ensuring accurate gear selection and dependable automatic transmission performance.
Fits:
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
Diagram Ref No 2
The contact sensor is a vital component within the automatic transmission selector mechanism, allowing the vehicle's electrical systems to correctly identify the selected gear position. Over time, the original sensor can wear, become contaminated, or develop electrical faults, resulting in incorrect gear indication, intermittent starting problems, or erratic transmission operation. This OE Match replacement restores reliable communication between the selector mechanism and transmission control system, making it ideal for maintenance, repairs, and restoration projects.
What This Product Does:
- Detects the position of the automatic transmission selector.
- Communicates gear selection to the transmission control system.
- Supports accurate and reliable transmission operation.
- Helps ensure the engine starts only in the correct selector positions.
- Maintains accurate gear position indication.
- Restores dependable communication between the selector and transmission.
- Provides an OE-style fit and reliable electrical performance.
Symptoms Of Wear Or Failure:
- Incorrect gear position displayed.
- Difficulty starting the vehicle in Park or Neutral.
- Intermittent no-start condition.
- Erratic or inconsistent automatic transmission operation.
- Gear selector position not recognised correctly.
- Transmission-related electrical fault codes.
- Corroded or damaged sensor connections.
- Age-related deterioration of the original component.
Why Replacement Matters:
- The automatic transmission contact sensor is an essential component that allows the transmission control system to accurately recognise the selected gear. A worn or faulty sensor can cause incorrect gear indication, unreliable starting, and inconsistent transmission performance, potentially affecting both safety and drivability.
- Replacing a defective contact sensor restores accurate gear position detection, dependable communication with the transmission control system, and smooth automatic transmission operation. Manufactured to OE-style specifications, this OE Match replacement provides the correct fit, reliable performance, and long-lasting durability, making it an excellent choice for routine maintenance and classic Porsche restoration projects.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
171927145A
The product you are viewing cross references to these numbers
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
Shop Securely
12 Month Warranty
Worldwide Delivery
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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