Audi A8 D4 2009–2018 Hose 4H0422891AJ 4H0422891AB

Product overview

This new hose is referenced to Audi OE numbers 4H0422891AJ and 4H0422891AB and is listed as a coolant hose. It is listed for the Audi A8 D4 generation. Hoses deteriorate with heat and age, and a leaking or swollen line can cause fluid loss, overheating or warning lights.

Typical signs that a hose needs replacing include visible cracking, softness or swelling when squeezed, damp patches around the connections and a gradual drop in fluid level.

Vehicle compatibility

Listed fitment data (14 entries) lists the Audi A8 D4 with these engines:

• Petrol: 2.5 TFSI, 3.0 TFSI quattro, 4.0 TFSI quattro, 4.2 FSI quattro, 6.3 W12 quattro and S8 quattro
• Diesel: 3.0 TDI (including quattro) and 4.2 TDI quattro
• Hybrid: 2.0 TFSI hybrid

Production dates span 2009 to 2018. However, the listing attributes reference the A8L for 2017 to 2024, and the part listing mentions the A6 C6 2.4. These conflicting details mean fitment is treated as partial. In Audi numbering, the 422 group generally relates to steering system parts, so this item may be a steering fluid or cooler line rather than an engine coolant hose; please confirm before ordering.

Key features

• Replacement hose referenced to two Audi OE numbers
• Listed for a wide spread of A8 D4 engines
• New condition
• Useful for workshops servicing Audi luxury models

Technical specifications

Installation requirements

Professional installation is recommended. Ensure the engine is cool and the system is depressurised, catch any fluid, and fit new clips or seals where required. Refill with the correct specified fluid, bleed the system and check carefully for leaks.

Inspect neighbouring hoses and connections at the same time, as they are often of a similar age.

Fitment checks before ordering

Match the OE number on your existing hose and confirm by VIN before ordering.

We can help check.

Package inclusions

1 x hose. Clips and seals are not included unless stated.

Shipping information

Shipped from China to customers in Australia and New Zealand. Freight is calculated at checkout based on your delivery address, and actual freight is confirmed at the time of order.

Special Order Item

This product is a special-order item sourced specifically for your vehicle. Please allow an estimated lead time of 3-4 weeks for sourcing and delivery. Lead times are estimates and may vary depending on supplier availability, order processing, and international shipping. We recommend confirming availability before placing your order.