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Details
| Specification | Value |
|---|---|
| Brand | BSG |
| MPN | bsg90-550-006 |
| Category | coolant expansion tank |
| Weight [kg] | 0 kg |
| Component Number | BSG 90-550-006 |
OE numbers (2)
Search by this OE number to find compatible parts
- AUDI / SEAT / SKODA / VW—1K0 121 407
- AUDI / SEAT / SKODA / VW—1K0 121 407 A
Where this part fits
Original-fit position for OE 1K0121407A. The red ring marks where this part installs on the vehicle.
About this product
The BSG coolant expansion tank (BSG 90-550-006) is a professional-grade replacement component engineered for long service life and reliable operation across all conditions your vehicle encounters. The part is built to the following specification: Weight [kg]: 0 kg, Number of connectors: Aluminium, Supplementary Article/Info 2: Nylon, Component Number: BSG 90-550-006. Each dimension is checked against the OEM reference to ensure the component seats and functions correctly first time. Verified to fit AUDI, SEAT, SKODA, VW models. All compatibility data is cross-checked against the TecDoc database — select your vehicle to confirm the part matches your specific engine and year. This part supersedes original equipment references: 002-60-12176, 01414, 03817, 043022N and 38 more. Matching these numbers confirms a like-for-like replacement with no loss of function. BSG 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 with tracked delivery and a 14-day money-back guarantee with hassle-free returns.
Suitable cars
Equivalent products (43)
Show all 43 OE numbers
coolant expansion tank BSG BSG 90-550-006 — compatible car models
| Car models | AUDI: A3 (8P1), A3 Convertible (8P7), A3 Sportback (8PA), Q3 (8UB, 8UG), TT (8J3), TT Roadster (8J9); SEAT: ALHAMBRA (710, 711), ALTEA (5P1), ALTEA XL (5P5, 5P8), LEON (1P1), TOLEDO III (5P2); SKODA: OCTAVIA II (1Z3), OCTAVIA II Combi (1Z5), RAPID (NH3, NK3, NK6), RAPID Spaceback (NH1), SUPERB II (3T4), SUPERB II Estate (3T5), YETI (5L); VW: BEETLE (5C1, 5C2), BEETLE Convertible (5C7, 5C8), CADDY III Box Body/MPV (2KA, 2KH, 2CA, 2CH), CADDY III MPV (2KB, 2KJ, 2CB, 2CJ), CADDY IV Box Body/MPV (SAA, SAH), CADDY IV MPV (SAB, SAJ), CC B7 (358), EOS (1F7, 1F8), GOLF PLUS V (5M1, 521), GOLF V (1K1) (+2 more) |
|---|---|
| Engines | 1.2 TSI; 1.2 TFSI; 1.4 TSI; 1.8 TFSI; 1.4 16V |
| Year of manufacture | 2003-2022 |
| Manufacturer article number (MPN) | BSG 90-550-006 |
| OE part numbers | 1K0 121 407, 1K0 121 407 A |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
BSG bsg90-550-006 coolant expansion tank. Component Number: BSG 90-550-006. Number of connectors: 2. Supplementary Article/Info 2: 14. Weight [kg]: 0 kg
- 1x coolant expansion tank
Shipping, returns, warranty
Free UK delivery on orders over £99.00. Tracked standard shipping.
- Standard delivery: 5–9 business days
- Order before 5pm — ships the next working day
- 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 BSG coolant expansion tank have?
This BSG coolant expansion tank has the following specifications: Weight [kg]: 0 kg; Number of connectors: 2; Supplementary Article/Info 2: 14; Component Number: BSG 90-550-006. 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: 1K0 121 407, 1K0 121 407 A. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a coolant expansion tank cost?
Coolant expansion tank prices vary depending on brand, specifications, and vehicle compatibility. Check the current price above for this BSG coolant expansion tank. All parts come with 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 1K0 121 407?
Yes, this BSG coolant expansion tank is a direct replacement for OE part number 1K0 121 407. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
Related categories
Common OE numbers for this part
Common original equipment numbers linked to stocked alternatives.
