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Details
| Specification | Value |
|---|---|
| Brand | RIDEX |
| MPN | 397e0128 |
| Category | coolant expansion tank |
| Number of pins | 2 -pin connector |
OE numbers (3)
Search by this OE number to find compatible parts
- AUDI / SEAT / SKODA / VW—5Q0 121 407A
- AUDI / SEAT / SKODA / VW—5Q0 121 407G
- AUDI / SEAT / SKODA / VW—5Q0 121 407T
Where this part fits
Original-fit position for OE 5Q0121407T. The red ring marks where this part installs on the vehicle.
About this product
The RIDEX coolant expansion tank (397E0128) 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: Material: Plastic, Heating/Cooling: 39, Forward- /Backflow: Steel, Number of pins: Aluminium -pin connector, Supplementary Article/Info 2: 361. 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: 03344, 043023N, 053-026-019, 07.40.081 and 16 more. Matching these numbers confirms a like-for-like replacement with no loss of function. RIDEX 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 (18)
coolant expansion tank RIDEX 397E0128 — compatible car models
| Car models | AUDI: A3 (8V1, 8VK), A3 Convertible (8V7, 8VE), A3 Limousine (8VS, 8VM), A3 Sportback (8VA, 8VF), Q2 (GAB, GAG), Q3 (F3B), TT (FV3, FVP), TT Roadster (FV9, FVR); SEAT: ATECA (KH7, KHP), LEON (5F1), LEON SC (5F5), LEON ST (5F8); SKODA: FABIA III Estate (NJ5), FABIA III (NJ3), KAROQ (NU7, ND7), KODIAQ I (NS6, NS7, NV7), OCTAVIA III (5E3, NL3, NR3), OCTAVIA III Combi (5E5, 5E6), SUPERB III (3V3), SUPERB III Estate (3V5), YETI (5L); VW: ARTEON (3H7, 3H8), ATLAS (CA1, CA2, CA3), GOLF SPORTSVAN VII (AM1, AN1), GOLF VII (5G1, BQ1, BE1, BE2), GOLF VII Variant (BA5, BV5), PASSAT B8 (3G2, CB2), PASSAT B8 Variant (3G5, CB5), SCIROCCO III (137, 138), TIGUAN (AD1, AX1) |
|---|---|
| Engines | 1.6 TDI; 35 TDI; 2.0 TFSI; 1.4 TGI; 1.4 TSI; 1.0 TSI; 1.5 TSI; 2.0 TDI; 1.2 TSI; 2.0 TSI 4motion; 1.4 GTE Hybrid |
| Year of manufacture | 2008-2024 |
| Manufacturer article number (MPN) | 397E0128 |
| OE part numbers | 5Q0 121 407A, 5Q0 121 407G, 5Q0 121 407T |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
RIDEX 397e0128 coolant expansion tank. Connector Shape: 5. Forward- /Backflow: 1. Heating/Cooling: 39. Material: 6. Number of pins: 2 -pin connector. Supplementary Article/Info 2: 14. Supplementary Article/Info 2: 361
- 1x coolant expansion tank
Shipping, returns, warranty
Free UK delivery on orders over £50.00. Tracked standard shipping.
- Standard delivery: 4–8 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 RIDEX coolant expansion tank have?
This RIDEX coolant expansion tank has the following specifications: Material: 6; Heating/Cooling: 39; Forward- /Backflow: 1; Number of pins: 2 -pin connector; Supplementary Article/Info 2: 361; Supplementary Article/Info 2: 14. 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: 5Q0 121 407A, 5Q0 121 407G, 5Q0 121 407T. 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 RIDEX 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 5Q0 121 407A?
Yes, this RIDEX coolant expansion tank is a direct replacement for OE part number 5Q0 121 407A. 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.
