The 5N0 122 291C is an OE-style lower radiator coolant hose adapter by VIKA, engineered for the VW Tiguan Mk1 (5N-chassis) with the 2.0L four-cylinder engine. Positioned at the front lower radiator hose junction, this coupling piece connects the lower coolant hose to the radiator outlet port, completing the primary cooling circuit return path. It serves as a cost-effective alternative to the Genuine VW lower adapter. Always confirm fitment by VIN before ordering.
$10.00
The 5N0 122 291C Coolant Hose Adapter by VIKA is an OE-style lower radiator coupling piece. Specifically, it is designed for the Volkswagen Tiguan Mk1 (5N-chassis) equipped with the 2.0L four-cylinder engine. Positioned at the front lower hose-to-radiator junction, this fitting connects the lower coolant hose to the radiator outlet port, completing the return path of the primary cooling circuit. Furthermore, the 5N0 122 291C is the lower-position counterpart to the upper adapter (5N0 122 291), and both fittings serve distinct positions within the same cooling circuit. Because the 5N-chassis Tiguan uses a unique PQ46-based cooling layout, this adapter is specific to the Mk1 Tiguan (2009–2018). As a result, it does not interchange with Mk2 MQB-platform Tiguan variants.
Over time, the plastic body of the 5N0 122 291C coolant hose adapter weakens from continuous heat cycling and sustained coolant pressure. In particular, the lower coupling port — where returning coolant flows from the radiator back toward the engine — experiences frequent temperature swings between cold start and operating temperature. Consequently, the plastic body can develop hairline cracks at the port walls or coupling groove. Additionally, the sealing surface can warp or degrade, breaking the tight junction between the hose and the adapter. Even a small failure at this position allows coolant to bypass the coupling, leading to gradual coolant loss and recurring low-coolant warnings. Therefore, replacing the failing 5N0 122 291C promptly prevents the risk of progressive engine overheating.
VIKA is a European OE-style aftermarket supplier that engineers cooling components to factory connector geometry and port dimensions. As a result, the 5N0 122 291C fits the lower radiator hose junction without modification. Moreover, VIKA’s precision-molded plastic/composite construction matches the wall thickness and coupling engagement tolerances of the Genuine VW part. Consequently, the sealing performance meets OE-style standards while offering a cost-effective price alternative to the dealer component. In addition, the direct-fit design means installation requires no special tools or hose rerouting.
Catching a failing 5N0 122 291C early prevents escalating cooling system damage. Therefore, watch for these warning signs:
Coolant seeping or leaving dried residue near the lower radiator hose coupling at the front of the radiator
Recurring low coolant level warnings despite topping off the reservoir, with no other visible leak source
A sweet coolant odor from the lower engine bay after reaching normal operating temperature
Visible cracking, crazing, or discoloration on the plastic coupling body or at the hose barb
The lower radiator hose feeling loose at the coupling connection or showing signs of seeping at the joint
If any of these symptoms appear, replace the 5N0 122 291C promptly. Additionally, inspect the upper adapter (5N0 122 291) at the same time, since both fittings share the same heat and pressure exposure on the Tiguan Mk1.
OEM Reference: 5N0 122 291C (VIKA OE-style aftermarket)
Lower radiator coolant hose adapter — front position
Precision-molded plastic/composite construction to match OE connector geometry
Engineered specifically for the lower radiator hose junction on the VW Tiguan Mk1 (5N-chassis)
Compatible with the 2.0L EA113/EA888 engine (1984cc)
Compatible with factory-style hose clamps and O-rings (where applicable)
Cost-effective OE-style alternative to the Genuine VW dealer component
Direct-fit replacement — no modifications required
First, confirm fitment by VIN — this lower adapter fits the Tiguan Mk1 (5N) only and does not fit Mk2 MQB variants
Next, replace any associated O-rings and hose clamps during installation; never reuse worn sealing hardware on a new coupling
Also, inspect the upper adapter (5N0 122 291) at the same service interval; replacing both fittings together prevents a repeat cooling system visit
Then, inspect the lower radiator hose for softness, swelling, or cracking at the coupling end before reinstalling
Finally, refill with VW-approved G12++/G13 coolant and bleed the cooling system completely to eliminate air pockets before returning the vehicle to service
Always verify fitment by VIN before ordering. Multiple variants may exist within the same model year.
5N0 122 291C (VAG OEM reference — VIKA OE-style replacement)
5N0-122-291-C (alternate formatting)
| Weight | 0.25 lbs |
|---|---|
| Dimensions | 6.0 × 4.0 × 3.0 in |
| Year | Make | Model | Engine | Notes |
|---|---|---|---|---|
| 2009-2017 | Volkswagen | Tiguan | 2.0L |
The Meyle 8E0 121 403 Coolant Tank is a direct-fit OEM-style expansion tank engineered for Audi A4 B6 and B7 platform models. Furthermore, it manages thermal expansion, maintains correct system pressure, and serves as the primary coolant fill point — with an integrated level sensor included for a complete, plug-and-play installation.
The 8W0 122 293A is a Genuine Audi OE upper coolant hose coupling for the Audi A4 (B9), A4 allroad, A5, and A5 Sportback equipped with the 2.0L 45 TFSI petrol engine (2017–2020). Positioned at the water pump housing, this flange connects the upper radiator coolant hose and includes a C-clip and seal in the box. Because this coupling is a single-use component, always install a new unit whenever the upper coolant hose is disturbed — no modifications required.
The 5Q0 122 291AC is the OE right-side coolant bypass line adapter (T-piece) used on select 2018–2023 Volkswagen and Audi MQB-platform vehicles equipped with a 2.0L engine and manual transmission. Positioned on the passenger side of the cooling circuit, it serves as the outlet adapter for the cooling system bypass line — a distinct application from the central water pump connectors used on the same platform. Always confirm fitment by VIN before ordering, as this part is transmission-specific.
The ABS Speed Sensor WHT003860 is a genuine-spec, OE-quality replacement for select Volkswagen and Audi models. It delivers precise wheel-speed data to your ABS, ESP, and traction control systems with a direct plug-and-play installation and no modifications required.
The Service Tech ABS Speed Sensor WHT003858 is a cost-effective, OE-style replacement for select Audi and Volkswagen models. It delivers accurate wheel-speed data to your ABS, ESP, and traction control systems — restoring full safety-system performance with a straightforward plug-and-play installation.
