Porsche PDK Distance Sensor and Speed Sensor - 911, Boxster/cayman, 7DT45/7DT70

7DT45 / 7DT70 – Solve P17xx & P07xx Without Gearbox Replacement

This OEM-style PDK distance / shift fork position (speed) sensor restores accurate displacement feedback to the transmission control unit (TCU), allowing correct gear recognition and shift execution — without replacing the complete gearbox.

Designed and manufactured by BOTONG AUTO ELECTRONICS, with over 30 years of experience in automotive electronics and transmission repair.

This is a brand-new component-level repair solution, not refurbished or salvaged.

Key Features

• OEM-style LVDT technology (not Hall-based)

• Integrated distance + speed sensor

• True physical linearity

• High-temperature stability

• Heat-resistant PA66-30 housing

• Plug-and-play installation

• No coding or cloning required

• Supports PIWIS Tester 3 calibration

• 3-Year warranty

• Best price - $1099 USD

Applications

Porsche 911 – 997 / 991 / 992 / GT3 / GT3 RS

Porsche Boxster / Cayman – 987 / 981 / 718 / 982

Porsche Macan – 7-speed PDK

PDK Gearboxes: 7DT45 & 7DT70

Replaces Porsche Part Numbers:0501325775 / 0501327105 / 0501324703

⚠️ Market Reality: Most Aftermarket Sensors Are Hall-Based Alternatives

Currently, the majority of replacement sensors available in the aftermarket are Hall-based designs, not true LVDT inductive sensors like the Porsche OEM version.

Hall-based sensors rely on:

• Magnetic field strength measurement

• Active semiconductor circuitry

• Algorithm-based linearity compensation

• Software correction to simulate displacement linearity

While they are cheaper to manufacture, they introduce:

• Temperature sensitivity

• Long-term signal drift

• Increased electronic failure risk

• Dependence on compensation algorithms

• Reduced predictability in closed-loop clutch control

For a high-precision transmission such as Porsche PDK, which relies on accurate displacement feedback for clutch engagement and shift fork positioning, these compromises can result in:

• Implausible signal faults (P17xx series)

• Ratio monitoring errors (P0730–P0732)

• Intermittent limp mode

• Repeat failures after replacement

  
  

Our Solution: OEM-Style LVDT Technology

We use true inductive LVDT (Linear Variable Differential Transformer) technology, the same measurement principle as Porsche OEM.

Why LVDT Is Superior for PDK

Trust from physics, not software correction.

That is critical in a dual-clutch transmission operating under high temperature and high-speed conditions.

Why We Use Heat-Resistant Nylon Instead of Metal Housing

This deserves its own technical explanation.

Many aftermarket alternatives use metal housings because they appear stronger or more “premium.” However, in an inductive LVDT sensor design, metal can negatively influence electromagnetic behavior.

We use PA66-30 heat-resistant nylon, an upgraded engineering-grade material.

Technical Advantages of PA66-30 Nylon

Factor	PA66-30 Heat-Resistant Nylon	Traditional Metal Housing
Electromagnetic Interference	Non-conductive – no inductive disturbance	Can influence magnetic field stability
Thermal Expansion Stability	Controlled and predictable	Excessive thermal expansion coefficient, causing potting compound cracking
Coil Stability	Reduced external interference	Metal proximity can affect inductive balance
Weight	Lighter	Heavier
Long-Term Signal Stability	Improved	May introduce micro-variation

Why This Matters

An LVDT sensor works by detecting precise electromagnetic displacement inside the coil assembly.

Metal housings can:

• Slightly alter the magnetic flux distribution

• Increase inductive interference

• Affect signal consistency at high temperature

By using high-temperature resistant nylon, we:

• Reduce external influence on the inductive coil

• Improve long-term stability

• Enhance signal precision

• Increase durability under transmission heat conditions

This is not a cost-saving decision — it is a precision-driven engineering choice.

OBD Fault Codes Commonly Resolved

Distance / Displacement Sensors

Fault Code	Description	Technical Interpretation
P1731–P1738	Shift Rod Displacement Sensor – Electrical Malfunction / Implausible Signal	Internal LVDT instability or signal drift
P1764	Distance / Gear Position Sensor – Implausible Signal (Clutch 1)	Clutch 1 position feedback deviation
P1773	Distance / Gear Position Sensor – Implausible Signal (Clutch 2)	Clutch 2 position feedback deviation
P1765	Distance / Gear Position Sensor – Electrical Fault (Clutch 1)	Electrical circuit fault
P1774	Distance / Gear Position Sensor – Electrical Fault (Clutch 2)	Electrical circuit fault
P073D	Unable to Engage Gear (Resulting Fault)	TCU cannot confirm engagement

Speed Sensors

Fault Code	Description	Technical Interpretation
P173D	Speed Sensor Clutch 1 – Short to B+	Voltage short affecting signal
P173E	Speed Sensor Clutch 2 – Short to B+	Voltage short affecting signal
P1744	Transmission Input Shaft Speed Sensor – Plausibility Check (Clutch 2)	Speed reading inconsistent
P1745	Input Shaft 1 or 2 Overspeed	Shaft speed outside expected range

Ratio Monitoring / Resulting Faults

Fault Code	Description
P0730	Incorrect Gear Ratio – TG1/TG2
P0731	Incorrect Gear Ratio – Gear Train 1
P0732	Incorrect Gear Ratio – Gear Train 2

Important Installation Reminder

Before installing the shift displacement sensor:

Ensure the shift fork is set to Neutral (N) position.

VIN Verification Required

Please email your VIN before placing an order to confirm compatibility at botongautoelectronics.com

For Porsche 911, Boxster/Cayman PDK 7DT45 7DT70 Distance Sensor Speed Sensor

$1,099.00

Buy Now