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Ignition Switch

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DISPLAYING 1 to 8 (of 8 products)
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4B0905849
Product Information
Product Information
Ignition starter switch.

porsche

Fits:
Porsche 986 Boxster 2004>>
Porsche 996 2004>>
Porsche 996 Turbo 2004>>
Porsche 996 GT3 2004>>
Porsche Carrera GT 2004>

Click 'Zoom in' for large parts diagram.
Diagram ref no 22

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4B0905849
4B0905849
1190400800

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4B0905849/1
Product Information
Product Information
Ignition starter switch.

oematch

Fits:
Porsche 986 Boxster 2004>>
Porsche 996 2004>>
Porsche 996 Turbo 2004>>
Porsche 996 GT3 2004>>
Porsche Carrera GT 2004>

Click 'Zoom in' for large parts diagram.
Diagram ref no 22

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4B0905849
4B0905849
1190400800

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Special Order item
4A0905849B
Product Information
Product Information
Ignition starter switch.
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

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4A0905849B
4A0905849B
99634701707

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4A0905849B/1
Product Information
Product Information
Ignition starter switch.
Fits: RHD or LHD CARS

oematch

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Related, superseded, cross reference or alternative numbers for comparison.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
4A0905849B
99634701707
201-1816

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Special Order item
99634701707
Product Information
Product Information
Replacement steering lock housing, sticking key lock is a very common problem on Porsche 996 and Porsche Boxster 986 models.

porsche

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
4B0905849

The product you are viewing cross references to these numbers
99634701707/1
Product Information
Product Information
Replacement steering lock housing, sticking key lock is a very common problem on Porsche 996 and Porsche Boxster 986 models.

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

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99634701707
99634701707

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Special Order item
99663735100
Product Information
Product Information
Key head remote control upper part.

porsche

Fits:
Porsche 986 Boxster 2001-04
Porsche 996 2002-05 TARGA

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99663735100
99663735100

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Special Order item
99642607303
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Product Information
Release cable - runs from ignition switch to Tiptronic selector lever, preventing the key from being removed whilst the car is in gear (amongst other functions).

porsche

Fits:
Tiptronic transmission only

Porsche 986 Boxster / S 1997-04
Porsche 996 Carrera 1998-05
Porsche 996 Turbo 2001-05

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99642607303
99642607303

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DISPLAYING 1 to 8 (of 8 products)
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About Ignition Switch

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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