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Details
| Specification | Value |
|---|---|
| Brand | Borsehung |
| MPN | b11943 |
| Category | coolant expansion tank |
OE/OEM numbers (11)
Search by this OE number to find compatible parts
Show all 11 OE numbers
- VAG—1J0121321+
- VAG—1J0121321A+
- VAG—1J0121321B+
- VAG—1J0121403+
- VAG—1J0121403A+
- VAG—1J0121403B+
- VAG—1J0121403E+
- VAG—1J0121407C+
- VAG—1J0121407E+
- VAG—1J0121407F+
- VAG—3B0121321+
About this product
Borsehung coolant expansion tank (B11943) is manufactured to OEM tolerances, ensuring a direct-fit replacement that restores your vehicle to factory specification without any modification. Technical specifications — Supplementary Article/Info 2: 287 — are verified against the OEM data sheet to guarantee fitment accuracy and performance parity with the original equipment. Compatible with AUDI, SEAT, SKODA, VW 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: 1J0121321, 1J0121321+, 1J0121321A, 1J0121321A+ and 22 more. Matching these numbers confirms a like-for-like replacement with no loss of function. Borsehung is a recognised supplier of automotive replacement 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.
Suitable cars
Equivalent products (4)
coolant expansion tank Borsehung B11943 — compatible car models
| Car models | AUDI: A3 (8L1); SEAT: CORDOBA (6K1, 6K2), IBIZA II (6K1), LEON (1M1), TOLEDO II (1M2); SKODA: OCTAVIA I (1U2), OCTAVIA I Combi (1U5), OCTAVIA I Estate Van (1U5), OCTAVIA II (1Z3), OCTAVIA II Combi (1Z5); VW: BORA I (1J2), BORA Variant (1J6), GOLF IV (1J1), GOLF IV Van (1J1), GOLF IV Variant (1J5), GOLF VAN IV Variant (1J5), NEW BEETLE (9C1, 1C1) |
|---|---|
| Engines | 1.6; 1.8 T 20V Cupra; 1.4 16V; 1.4; 1.9 D; 1.9 SDI; 2.0 |
| Year of manufacture | 1993-2013 |
| Manufacturer article number (MPN) | B11943 |
| OE part numbers | 1J0121321+, 1J0121321A+, 1J0121321B+, 1J0121403+, 1J0121403A+, 1J0121403B+, 1J0121403E+, 1J0121407C+, 1J0121407E+, 1J0121407F+, 3B0121321+ |
Compatibility check
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Please wait while we load vehicle compatibility information.Description and what's included
Borsehung b11943 coolant expansion tank. Supplementary Article/Info 2: 287
- 1x coolant expansion tank
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 coolant expansion tank compatible with my car?
This coolant expansion tank fits AUDI, SEAT, SKODA, VW 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 Borsehung coolant expansion tank have?
This Borsehung coolant expansion tank has the following specifications: Supplementary Article/Info 2: 287. Check the full specifications table above for complete details.
What OE part numbers does this coolant expansion tank replace?
This coolant expansion tank replaces OE part numbers: 1J0121321+, 1J0121321A+, 1J0121321B+, 1J0121403+, 1J0121403A+, 1J0121403B+, 1J0121403E+, 1J0121407C+ and 3 more. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a coolant expansion tank cost?
This Borsehung coolant expansion tank is available for £19.99. Coolant expansion tank prices vary depending on brand, specifications, and vehicle compatibility. Borsehung parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my coolant expansion tank?
Regular inspection of your coolant expansion tank 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 coolant expansion tank?
Tools needed: hose clamp pliers, flat-head screwdriver, 8mm socket, coolant top-up bottle. Difficulty: Easy DIY. Safety warning: Only open the expansion tank cap when the engine is completely cold -- coolant system is under pressure when hot and will spray scalding fluid if opened.
Can I use this part as a replacement for OE 1J0121321+?
Yes, this Borsehung coolant expansion tank is a direct replacement for OE part number 1J0121321+. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
