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Porsche // 996 (911) (1997-2005) // 996 GT2 2001-05
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Ignition Switch
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
Fits: RHD or LHD CARS
VAG Brand
Fits:
Porsche 986 Boxster 1997-04
Porsche 996 upto 2004
*Tip:
If you have a sticky key lock or the key is difficult to get out then replace the steering lock housing, sticking key lock is a very common problem on Porsche 996 and Porsche Boxster 986 models.
Code: 99634701707
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
4A0905849B
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
The OE MATCH Ignition Starter Switch is a electrical component designed to control the vehicle’s ignition and starter system. Installed behind the ignition lock barrel, the switch transfers the driver’s key input into electrical signals that activate the vehicle’s accessory circuits, ignition system, and starter motor.
Fits:
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
Diagram Ref No 22
This OE MATCH ignition starter switch is engineered to provide reliable electrical contact, smooth operation, and direct-fit compatibility with the original wiring system. It plays a vital role in vehicle starting, power distribution, and overall electrical system functionality.
What This Product Does:
- Activates the vehicle ignition system when the key is turned
- Controls power delivery to accessory and ignition circuits
- Engages the starter motor to start the engine
- Distributes electrical power to key vehicle systems
- Works in conjunction with the ignition lock assembly
- Ensures reliable vehicle starting and operation
Symptoms Of Wear Or Failure:
- Engine fails to crank when the key is turned
- Intermittent starting problems
- Loss of power to ignition or accessory circuits
- Dashboard warning lights behaving erratically
- Key turning normally but no starter engagement
- Vehicle stalling due to ignition power interruption
- Electrical accessories failing to operate correctly
- Burnt contacts causing inconsistent electrical connections
Why Replacement Matters:
- Restores dependable engine starting functionality
- Ensures proper power distribution to ignition and accessory systems
- Prevents intermittent starting and electrical faults
- Maintains consistent communication between the key and vehicle systems
- Reduces the risk of unexpected breakdowns
- Supports safe and reliable vehicle operation
- Provides OE-style fitment and performance
- Helps preserve the integrity of the vehicle’s electrical and starting systems
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
4A0905849B
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
Ignition Problem Symptoms:
- Car won't start
- Tough to start
- Key gets stuck in ignition
- Key sticking in tumbler
Fits: RHD or LHD CARS
Fits:
Porsche Boxster 986
Porsche 996 upto 2004
Diagram Ref No. 20
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99634701707
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
Ignition Problem Symptoms:
- Car won't start
- Tough to start
- Key gets stuck in ignition
- Key sticking in tumbler
Fits: RHD or LHD CARS
Fits:
Porsche Boxster 986
Porsche 996 up to 2004
Diagram Ref No. 20
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99634701707
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche Carrera GT 2003-06
The Genuine Porsche Ignition Lock Cylinder (Part Number: 99634791502) is an original equipment ignition and steering lock component designed for selected Porsche 911 (996) and Boxster (986) models.
Fits:
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche Carrera GT 2003-06
Diagram Ref No 21
Manufactured to Porsche's original equipment specifications, this mechanical lock cylinder forms part of the ignition switch and steering lock assembly, providing the key-operated mechanism used to select the vehicle's ignition positions and initiate the starting process.
The ignition lock cylinder is designed to accept the appropriate ignition key and transfer its rotational movement to the associated ignition switch mechanism. It also works with the steering lock assembly to support the vehicle's original locking and security arrangement.
Unlike the electrical ignition starter switch, the lock cylinder is primarily a mechanical component. Its function is to provide the correct key engagement and mechanical operation required to actuate the ignition system.
Over time, the original ignition lock cylinder may develop wear due to repeated key insertion, removal and turning. Internal locking components may become worn, contaminated or damaged, making the key difficult to insert, turn or remove.
A worn or seized lock cylinder can cause starting difficulties, intermittent ignition operation or the inability to operate the ignition key.
Replacing a faulty ignition lock cylinder with a Genuine Porsche component helps restore smooth key operation, reliable mechanical ignition engagement and the original steering lock functionality.
Ideal for ignition lock repairs, steering column maintenance, ignition key problems and Porsche restoration projects, this Genuine Porsche replacement provides a factory-specified solution for compatible vehicles.
What This Product Does:
The ignition lock cylinder is the mechanical key-operated component within the Porsche ignition and steering lock assembly.
Its primary function is to recognise a mechanically compatible key and allow the driver to rotate the ignition mechanism through its designated operating positions.
When the correct key is inserted and turned, the lock cylinder transmits rotational movement to the ignition starter switch, allowing the vehicle's electrical systems and starting circuit to be activated.
The lock cylinder also forms part of the steering lock arrangement, helping ensure the ignition mechanism operates as intended.
Its main functions include:
- Accepting the ignition key: Provides the mechanical key entry and locking mechanism.
- Controlling ignition rotation: Allows the key to turn through the appropriate ignition positions.
- Operating the ignition starter switch: Transfers key movement to the associated electrical switch.
- Supporting engine starting: Enables the mechanical action required to select the starting position.
- Supporting steering lock operation: Works with the steering lock assembly to maintain the intended locking functionality.
- Providing mechanical security: Prevents normal lock rotation when an incompatible key is inserted.
- Maintaining reliable key engagement: Allows the correct key to be inserted, turned and removed as intended.
- Preserving original vehicle functionality: Maintains Porsche's factory ignition lock configuration.
The ignition lock cylinder itself does not generate starter motor power or electronically authorise the immobiliser. Those functions depend on separate electrical and security components.
Symptoms Of Wear Or Failure:
The ignition lock cylinder is subjected to repeated mechanical operation whenever the vehicle is started or switched off.
Over time, internal locking elements, springs and contact surfaces may wear or become contaminated.
Common symptoms of a worn or faulty ignition lock cylinder include:
- Difficulty inserting the ignition key: Worn or damaged internal components may restrict normal key insertion.
- Key difficult to turn: The lock mechanism may become stiff, obstructed or partially seized.
- Ignition key sticking: The key may not move smoothly between ignition positions.
- Difficulty removing the key: Internal wear or incorrect mechanical engagement may prevent easy key removal.
- Intermittent ignition operation: An excessively worn mechanism may not consistently actuate the associated ignition switch.
- Ignition cylinder jamming: Damaged locking components may prevent rotation altogether.
- Excessive movement in the key mechanism: Internal wear may produce an unusually loose or imprecise feel.
- Steering lock release problems: A fault within the ignition or steering lock assembly may prevent normal steering lock disengagement.
- Key requiring repeated attempts: The driver may need to reposition or gently manipulate the key before the cylinder rotates.
- Worn or damaged ignition key: A heavily worn key may interact poorly with the cylinder and produce symptoms similar to internal lock wear.
- Broken key inside the cylinder: A damaged key may fracture and obstruct the locking mechanism.
- Visible damage around the ignition barrel: Signs of forced entry, impact or previous incorrect repairs may indicate lock damage.
Why Replacement Matters:
Replacing a damaged ignition lock cylinder is important for maintaining reliable key operation and the intended function of the Porsche ignition and steering lock assembly.
A worn cylinder may become increasingly difficult to operate and can eventually prevent the ignition key from turning.
If the cylinder seizes completely, the vehicle may become difficult or impossible to start using its normal ignition mechanism.
Installing a Genuine Porsche replacement Ignition Lock Cylinder helps to:
- Restore smooth key operation: Address sticking or binding caused by a confirmed faulty lock cylinder.
- Improve ignition reliability: Restore consistent mechanical engagement with the ignition switch.
- Prevent complete lock seizure: Replace worn internal components before the mechanism becomes inoperable.
- Support reliable engine starting: Ensure the mechanical ignition mechanism can reach the correct starting position.
- Restore normal key removal: Address key retention or removal difficulties caused by cylinder wear.
- Maintain steering lock functionality: Preserve the intended interaction between the ignition cylinder and steering lock assembly.
- Restore mechanical security: Replace damaged or excessively worn locking components.
- Reduce the risk of ignition-related breakdowns: Address developing lock faults before they prevent normal vehicle operation.
- Support ignition system repairs: Provide the correct mechanical component during steering lock or ignition assembly maintenance.
- Preserve original Porsche specifications: Maintain the factory ignition arrangement with a Genuine Porsche replacement.
- Support classic Porsche restoration: Replace deteriorated or damaged ignition hardware while restoring the vehicle.
- Maintain long-term usability: Restore dependable operation of a frequently used vehicle control.
Replacement is particularly recommended when the key consistently sticks, the cylinder becomes difficult to rotate or inspection confirms internal mechanical damage.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99634791502
The product you are viewing cross references to these numbers
Ignition Switches – Reliable Starting Power for Porsche Vehicles
The ignition switch is a vital component in your Porsche’s electrical and starting system. It’s the gateway between the driver and the vehicle’s ignition, responsible for powering essential circuits — from the starter motor and fuel pump to dashboard electronics and accessories.
At Design911, we supply a full range of genuine and high-quality ignition switches for Porsche models, including 911, Boxster, Cayman, Cayenne, Macan, and Panamera. Each switch is precision-engineered to ensuring smooth operation, reliable starting, and long-term durability.
What Does an Ignition Switch Do?
The ignition switch controls
the flow of electrical power throughout your vehicle. When the key is turned
(or the start button is pressed), the switch engages different electrical
stages:
- Accessory position: powers interior systems such as the radio or windows.
- On position: activates the engine’s control systems and dashboard electronics.
- Start position: sends power to the starter motor to crank the engine.
In modern vehicles, the ignition switch may also interface with immobiliser systems or electronic control modules for added security.
Why Do
Ignition Switches Fail?
Over time, ignition switches
can deteriorate due to wear, heat, vibration, and moisture exposure.
Common causes of failure include:
- Worn electrical contacts leading to intermittent or no power.
- Key cylinder wear causing stiffness or sticking when turning.
- Internal short circuits from heat or corrosion.
- Broken return springs preventing proper key position.
- General mechanical wear after years of use.
Symptoms of a failing
ignition switch include:
- The engine not cranking or starting.
- Electrical accessories failing to power on.
- The key getting stuck in the ignition.
- Flickering dashboard lights or intermittent electrical faults.
Why Replace a Faulty Ignition Switch?
A failing ignition switch can quickly escalate from an inconvenience to a breakdown or safety risk. Replacing it restores proper electrical control, ensuring your Porsche starts and runs reliably.
Benefits of
replacement include:
- Reliable engine starting and accessory power.
- Elimination of intermittent electrical faults.
- Improved safety and system reliability.
- OEM-level compatibility and performance.
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Brake & Clutch Switch
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Handbrake Switch
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