Ignition Switch 1K0-905-849-B
Neglecting to replace a faulty ignition switch can have serious consequences. Symptoms such as flickering lights, difficulty starting the engine, or the inability to turn off the vehicle can arise. Ignoring these signs may lead to a complete breakdown, leaving the vehicle inoperable at an inconvenient time.
Choosing an OEM part with the number 1K0-905-849-B guarantees high standards of manufacturing and material quality. It’s an ideal choice for maintaining the integrity of the ignition system, helping to avoid the pitfalls associated with lower-quality alternatives.
Available in Stores
| Seller | Price | Action |
|---|---|---|
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Leith Volkswagen
Official Dealer
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$134 |
| Seller | Price | Action |
|---|---|---|
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Volkswagen
New
|
$108 $78 | |
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Reydel VW of Linden
New
|
$113 $102 |
| Seller | Price | Action |
|---|---|---|
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Infoparts13.com.ua
Used
|
$78 | |
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INTEO на RIA
Used
|
$69 | |
|
AUTOMAFIA на РИА
Used
|
$69 |
| Seller | Price | Action |
|---|---|---|
|
Lewisville Volkswagen
New
|
$113 $101 |
| Seller | Price | Action |
|---|---|---|
|
Private seller
New
|
$17 | |
|
Private seller
New
|
$55 | |
|
Private seller
New
|
$7 |
Vehicle Fitment
Vehicles confirmed compatible with this part
Technical Specifications
| OEM Part Number | 1K0905849B |
|---|---|
| Part Type | Ignition Switch (Electrical) |
| Weight | Approximately 0.40 lb (0.18 kg) |
| Dimensions | — |
| Material | — |
| Mounting Type | Screws or clips behind ignition lock cylinder |
| Connector Type | Electrical plug connector (OEM multi-pin) |
| Location | Steering column, behind ignition lock cylinder |
| OEM Brands Covered | VW, Audi, SEAT, Škoda, Porsche, Cupra |
| Vehicle Years Covered | 2005–2019 (varies by model) |
One OEM part number covers VW, Audi, SEAT, Škoda, Porsche, and Cupra models spanning over a decade of production, from 2005 through 2019.
Sourced directly from the Volkswagen Group supply chain, this switch meets factory fit, form, and function requirements with no modification needed during installation.
Replacement requires only basic hand tools and battery disconnection, with no special programming or coding required for this electrical switch on most covered vehicles.
Compatible Aftermarket Alternatives
The following aftermarket parts are confirmed direct equivalents for OEM 1K0-905-849-B, cross-referenced from major manufacturer catalogs.
| Manufacturer | Part Number | Notes | Dimensions (mm) |
|---|---|---|---|
| FEBI BILSTEIN | 38638 | Well-regarded OE-supplier-grade German aftermarket brand; engineered to match OEM specifications. Good value for budget-conscious buyers. Recommended | — |
| URO Parts | 1K0905849B | Uses OEM part number; widely available through US aftermarket channels. Quality can vary by production batch. | — |
| AIC | 1K0905849B | European aftermarket supplier; uses OEM number cross-reference. Suitable as a cost-effective replacement. | — |
| AKUSAN | 1K0905849B | Aftermarket equivalent listed under OEM part number. Less common in North American markets; verify supplier reputation before purchase. | — |
Always verify fitment against your VIN before ordering.
How to Replace the Ignition Switch
Replacing the 1K0905849B ignition switch is a straightforward procedure requiring basic hand tools. Always disconnect the vehicle battery before working on any electrical component. Consult your vehicle-specific service manual for model-year torque values and trim-removal sequences, as minor variations exist across the wide compatibility range of this part.
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Disconnect the Battery
Turn off the vehicle and open the hood. Disconnect the negative (-) battery terminal to eliminate the risk of electrical shorts or accidental airbag deployment during the repair.
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Adjust and Prepare the Steering Column
Lower the steering wheel to its lowest tilt position to maximize access to the column covers. Set the ignition key to position 0 and remove the key.
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Remove Steering Column Covers
Locate and remove all screws securing the upper and lower steering column shrouds. Carefully unclip and separate the two cover halves to expose the ignition switch assembly.
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Disconnect the Electrical Connector
Identify the ignition switch mounted directly behind the ignition lock cylinder. Press the release tab and carefully unplug the electrical connector from the switch body.
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Remove the Old Ignition Switch
Remove any screws or release any retaining clips securing the ignition switch to its housing. Gently pull the switch straight out of the housing without forcing it.
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Install the New Ignition Switch
Align the new 1K0905849B switch with the housing, ensuring proper orientation. Slide it fully into position and secure with the original screws or clips. Reconnect the electrical connector until it clicks.
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Reassemble Steering Column Covers
Refit the lower and upper steering column shrouds, snapping the clips together and reinstalling all screws. Do not overtighten plastic trim screws.
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Reconnect Battery and Test
Reconnect the negative battery terminal. Insert the ignition key and cycle through all switch positions (ACC, ON, START) to verify smooth, correct operation before returning the vehicle to service.
Signs of a Worn Part
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Engine Won't Start
The vehicle cranks but fails to start, or there is no response when the key is turned to the Start position, indicating the switch is not completing the starter circuit.
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Intermittent Power Loss
Accessories, dashboard, or ignition power cut in and out unexpectedly while driving or during key insertion, suggesting worn internal switch contacts.
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Vehicle Stalls While Driving
The engine shuts off unexpectedly at speed due to the ignition switch momentarily losing contact with the run circuit, a potentially dangerous failure mode.
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No Accessory Power in ACC Position
Radio, windows, or other accessories fail to receive power when the key is turned to the Accessory position, indicating failure of that contact stage.
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Key Turns But Nothing Happens
The ignition key rotates through its positions but produces no electrical response — no dash lights, no crank. The electrical switch has failed completely while the lock cylinder may still function mechanically.
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Multiple Electrical Faults After Key Cycle
Erratic behavior across multiple systems — such as ABS, TPMS, or engine lights appearing and disappearing — can be caused by inconsistent voltage delivery from a failing ignition switch.
Replacement Intervals
Volkswagen Group does not publish a scheduled replacement interval for this ignition switch. Service is condition-based. If intermittent electrical symptoms appear, diagnose the switch before replacing other components such as the lock cylinder, battery, or starter relay.
Frequently Asked Questions
Is the 1K0905849B the same as the ignition lock cylinder?
No. The ignition switch (1K0905849B) is the electrical component mounted behind the mechanical lock cylinder. The lock cylinder is the part you physically insert and turn the key into. They are separate parts and can fail independently. This part number covers only the electrical switch.
Does replacing this ignition switch require dealer programming or coding?
For most vehicles in the compatibility range, the 1K0905849B is a purely electrical switch with no immobilizer logic stored in it. No programming is typically required. However, always verify for your specific model year, as some configurations may require a basic adaptation scan after installation.
Will an aftermarket substitute like the FEBI 38638 work as well as the genuine VW part?
FEBI BILSTEIN is an OE-tier supplier and their part 38638 is engineered to match OEM specifications. For most buyers, it represents a reliable and cost-effective alternative. If long-term peace of mind is the priority, the genuine VW part is the safest choice.
What vehicles is this part compatible with?
Compatibility includes a broad range of VAG vehicles: VW Beetle (2012–2019), Eos (2006–2013), GTI (2006–2014), Golf (2010–2014), Golf R (2012–2013), Jetta (2005–2018), Passat (2012–2018), Tiguan (2012–2017), Audi A3 and A3 Quattro (2006–2013), and Audi R8 (2008–2014), among others. Always verify by entering your VIN before ordering.
Can I replace the ignition switch myself, or do I need a mechanic?
This is considered a DIY-friendly repair for anyone comfortable with basic electrical work. The main requirements are disconnecting the battery, removing steering column covers, and swapping the electrical connector. No special tools or calibration equipment are needed. Budget approximately 1–2 hours for the job.
How do I confirm the ignition switch is the cause of my no-start issue before buying this part?
Use a multimeter to check for voltage output at the ignition switch harness connector when the key is turned to the ON and START positions. If the switch receives input voltage but does not pass it through to the correct output pins, the switch is faulty. A basic OBD-II scan can also reveal ignition-related fault codes that point to switch failure.
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