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Details
| Specification | Value |
|---|---|
| Brand | BOSCH |
OE/OEM numbers (8)
Where this part fits
Original-fit position for OE 1237539. The red ring marks where this part installs on the vehicle.
About this product
When switch unit ignition system performance matters, the BOSCH 0 227 100 203 delivers — built to the same dimensional and material standards as the original part it replaces. Compatible with ALFA ROMEO, FERRARI, VOLVO vehicles; use the vehicle selector above to confirm exact fitment for your make, model, and engine variant. Fitment data is sourced from TecDoc, the authoritative European parts catalogue. This part supersedes original equipment references: 0208MITKK, 0 227 100 203, 0 227 100 208, 0 227 100 214 and 8 more. Matching these numbers confirms a like-for-like replacement with no loss of function. BOSCH is a recognised supplier of automotive ignition components to independent workshops and dealer networks across Europe. All parts are sourced from authorised distribution channels and carry full manufacturer traceability — you receive exactly the same component supplied to professional garages and dealer workshops. If fitment or specifications do not match your vehicle, our technical team can help identify the correct alternative — use the vehicle selector or contact us with your VIN for a guaranteed-fit recommendation. Replacing worn components on schedule preserves your vehicle's safety, reliability, and resale value — and aftermarket parts from established brands deliver OEM-equivalent performance at a fraction of the dealer price. Every part is dispatched from our UK warehouse with a 30-day money-back guarantee and free hassle-free returns.
About BOSCH
Robert Bosch GmbH, founded in 1886 in Stuttgart, Germany, is one of the world's largest automotive parts suppliers. Bosch specialises in braking systems, fuel injection, spark plugs, alternators, and electronic engine management. As an OE supplier to virtually every major car manufacturer, Bosch parts meet or exceed original equipment specifications. With over 130 years of engineering innovation, choosing Bosch means choosing proven reliability backed by extensive research and development.
Suitable cars
Equivalent products (4)
Switch Unit Ignition System BOSCH 0 227 100 203 — compatible car models
| Car models | ALFA ROMEO: 164 (164); FERRARI: 456 GT/GTA, 512 TR, F50 Targa (W16); VOLVO: 960 (964), 960 II (964), 960 II Estate (965), S90 I (964), V90 I Estate (965) |
|---|---|
| Engines | 3.0 (164AG, 164H1); 5.5 (F116); 4.9; 4.7; 2.9; 2.5 |
| Year of manufacture | 1987-2004 |
| Manufacturer article number (MPN) | 0 227 100 203 |
| OE part numbers | 12 37 539, 1367776, 138225, 201401, 31441262, 60562702, 90444189, 90462248 |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
BOSCH 0227100203 . 0 227 100 203
- 1x Switch Unit Ignition System
Shipping, returns, warranty
Free UK delivery on orders over £99.00. Express and standard shipping available.
- Standard delivery: 2-5 business days
- Express delivery: 1-2 business days
- Free returns within 14 days
- All parts backed by manufacturer warranty
Warranty: 12-month manufacturer warranty on all parts. 14-day money-back guarantee if the part doesn't fit your vehicle.
Frequently Asked Questions
Is this Switch Unit Ignition System compatible with my car?
This Switch Unit Ignition System fits ALFA ROMEO, FERRARI, VOLVO vehicles. Use the vehicle selector at the top of the page to check exact compatibility — enter your car's make, model, and engine for a confirmed fitment match. All fitment data is verified through TecDoc.
What specifications does this BOSCH Switch Unit Ignition System have?
The package includes the Switch Unit Ignition System as described in the specifications above. Check the "What's included" section for a full list of components. If mounting hardware or accessories are required, they will be listed separately.
What OE part numbers does this Switch Unit Ignition System replace?
This Switch Unit Ignition System replaces OE part numbers: 12 37 539, 1367776, 138225, 201401, 31441262, 60562702, 90444189, 90462248. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Switch Unit Ignition System cost?
This BOSCH Switch Unit Ignition System is available for £71.99. Switch Unit Ignition System prices vary depending on brand, specifications, and vehicle compatibility. BOSCH parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my Switch Unit Ignition System?
Regular inspection of your Switch Unit Ignition System is recommended as part of routine vehicle maintenance. Watch for changes in performance, unusual noises, or visual signs of wear. Consult your vehicle's owner manual for manufacturer-recommended replacement intervals specific to your make and model.
What tools do I need to replace a Switch Unit Ignition System?
Tools required vary by vehicle make and model. Generally, a basic socket set, screwdrivers, and vehicle-specific tools may be needed. We recommend consulting a workshop manual for your specific vehicle, or having the Switch Unit Ignition System fitted by a professional mechanic.
Can I use this part as a replacement for OE 12 37 539?
Yes, this BOSCH Switch Unit Ignition System is a direct replacement for OE part number 12 37 539. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
Is the BOSCH 0 227 100 203 the same as the BOSCH 0 227 100 137?
No, while both are Switch Unit Ignition System parts, they are different products. The BOSCH 0 227 100 203 has specific dimensions, material composition, and fitting requirements. The BOSCH 0 227 100 137 may differ in dimensions, fitting position, or material composition. Always verify compatibility with your specific vehicle using our vehicle selector, or contact our customer service team for assistance.
Related categories
Common OE numbers for this part
Common original equipment numbers linked to stocked alternatives.
