Original VAG Group coolant expansion tank | with level sensor (5Q0121407AA)

Main Benefits

The original VAG 5Q0121407AA reservoir maintains optimal pressure in the cooling system, preventing overheating and leaks in modern EA211/EA888 engines without a silicate bag.
Confirmed SEAT models: Leon 5F (2012-), Ibiza 6J/KA (2008-), Ateca KH (2016-), Arona KJ (2017-) with G12evo/G13 coolant.

Technical Specifications

• OEM Reference: 5Q0121407AA (without cap, with level sensor)

• Capacity 1.5L, polypropylene (PP) material, weight 0.38 kg

• Internal thread M63x3, 2 coolant connections (flow/return)

• 2-pin D-shaped electrical sensor, without silicate bag (G13 and G12 EVO)

• Temperature up to 120°C, pressure 2 bar, dimensions ~192x196x158 mm

How to use / Who it's for

For SEAT Leon 5F, Ibiza 6J/KA, Ateca KH, Arona KJ, Tarraco CR 1.0/1.5 TSI, 1.6/2.0 TDI engines with G12evo/G13 system (2012-present).
VW Golf 7/8, Polo 6, T-Cross, Skoda Octavia 5E, Audi A3 8V MQB platforms. Replace due to cracks, leaks, or failed sensor.

Why choose it

The 5Q0121407AA reservoir prevents incompatible silicate/non-silicate mixtures that corrode the engine; an accurate sensor triggers an early dashboard warning light.
Superior to generic parts due to exact tolerances and certified PP plastic for 120°C/2 bar.

Frequently Asked Questions (FAQ)

Does it include a cap?
No, without cap (cap sold separately, reference 2Q0121321 or similar).
What coolant should I use?
G12evo/G13 without silicate (G12E050A2 or G13C).
Which SEAT models is it for?
Leon 5F, Ibiza 6J, Ateca, Arona 2012+ MQB engines.
What kind of sensor does it have?
2-pin D-shaped electrical sensor for level indicator.
Weight and measurements?
0.38 kg, ~192x196x158 mm, M63x3 thread.

Technical data sheet 

OEM reference: 5Q0121407AA
Type: Without silicate bag, with level sensor
Capacity: 1.5 liters
Material: Polypropylene (PP)
Cap thread: M63 x 3
Connections: 2 (coolant flow/return)
Weight: 0.38 kg
Temperature: Up to 120°C / 2 bar
Coolant: G12evo/G13 without silicate

Original VAG 5Q0121407AA reservoir without silicate with sensor; G13 compatible. Cap NOT included (2Q0121321).

Add the VAG 5Q0121407AA coolant reservoir to your cart and prevent overheating in your SEAT Leon/Ibiza MQB.