- Shop with confidence: competitive prices, exclusive deals, and delivery perks.
- Need it quickly? We dispatch fast-moving parts daily. Check delivery options.
- Swap or return items within the standard return period with a simple process.
- Questions about fitment or orders? Our support team is ready to help.
Similar products
Customers also bought
Details
| Specification | Value |
|---|---|
| Brand | GATES |
| MPN | 02-3074 |
| Inner Diameter 1 [mm] | 7 mm |
| Inner Diameter 2 [mm] | 3.5 mm |
| Hose Length [mm] | 550 mm |
OE/OEM numbers (1)
Search by this OE number to find compatible parts
- AUDI / VW—4H0121081BL
Where this part fits
Original-fit position for OE 4H0121081BL. The red ring marks where this part installs on the vehicle.
About this product
When heater hose performance matters, the GATES 02-3074 delivers — built to the same dimensional and material standards as the original part it replaces. The part is built to the following specification: Colour: Ceramic, Material: Plastic, Inner Diameter 1 [mm]: Ceramic mm, Inner Diameter 2 [mm]: Cast Iron, Rubber mm, Hose Length [mm]: 550 mm. Each dimension is checked against the OEM reference to ensure the component seats and functions correctly first time. Compatible with AUDI 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: 4H0121081BL, R251193. Matching these numbers confirms a like-for-like replacement with no loss of function. GATES 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.
Heater Hose buying guide
Why replace this part?
Heater hoses carry hot coolant from the engine to the heater core and back. A split heater hose causes coolant loss, loss of cabin heating, and engine overheating if the leak is significant enough to deplete the coolant level.
Signs you need a replacement
- Loss of cabin heat
- coolant leak inside or under the car
- sweet coolant smell inside the passenger compartment
- engine overheating
- soft or spongy hose texture when squeezed
When to replace
Every 4–5 years or 60,000–80,000 miles. Rubber hoses harden with age — inspect annually for cracks, swelling, or softness at the fittings.
About GATES
Gates Corporation, founded in 1911 in Denver, Colorado, USA, is a world leader in power transmission belts and fluid transfer solutions. Gates specialises in timing belts, timing belt kits, serpentine belts, coolant hoses, and tensioner assemblies. As an OE supplier to virtually every major automotive manufacturer, Gates products are engineered to meet or exceed original specifications. With advanced rubber compound technology and precision manufacturing, Gates belts and hoses deliver dependable performance and are the first choice of professional mechanics globally.
Suitable cars
Equivalent products (1)
Heater Hose GATES 02-3074 — compatible car models
| Car models | AUDI: A8 D4 (4H2, 4H8, 4HC, 4HL) |
|---|---|
| Engines | 3.0 TFSI quattro |
| Year of manufacture | 2009-2019 |
| Manufacturer article number (MPN) | 02-3074 |
| OE part numbers | 4H0121081BL |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
GATES 02-3074 . Colour: 7. Hose Length [mm]: 550 mm. Inner Diameter 1 [mm]: 7 mm. Inner Diameter 2 [mm]: 3,5 mm. Material: 6
- 1x Heater Hose
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 Heater Hose compatible with my car?
This Heater Hose fits AUDI 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 GATES Heater Hose have?
This GATES Heater Hose has the following specifications: Colour: 7; Material: 6; Inner Diameter 1 [mm]: 7 mm; Inner Diameter 2 [mm]: 3,5 mm; Hose Length [mm]: 550 mm. Check the full specifications table above for complete details.
What OE part numbers does this Heater Hose replace?
This Heater Hose replaces OE part numbers: 4H0121081BL. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Heater Hose cost?
This GATES Heater Hose is available for £39.99. Heater Hose prices vary depending on brand, specifications, and vehicle compatibility. GATES parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my Heater Hose?
Regular inspection of your Heater Hose 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 Heater Hose?
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 Heater Hose fitted by a professional mechanic.
Can I use this part as a replacement for OE 4H0121081BL?
Yes, this GATES Heater Hose is a direct replacement for OE part number 4H0121081BL. 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 GATES 02-3074 the same as the GATES 02-1598?
No, while both are Heater Hose parts, they are different products. The GATES 02-3074 has Colour: 7, Material: 6, Inner Diameter 1 [mm]: 7 mm. The GATES 02-1598 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.
