Coolant expansion tank bottle. Porsche 9J1.1 Taycan 2020-24  ❭  9J1121407A

Coolant expansion tank bottle
The MAHLE CRT 392 000S coolant expansion tank is a high-quality replacement reservoir for the Porsche Taycan’s liquid-cooling and thermal-management system. Cross-referenced to Porsche part number 9J1121407A, the unit is supplied with the reservoir cap and coolant-level sensor, providing a practical, complete replacement for a leaking, cracked or damaged original tank.

Fits:
Porsche 9J1.1 Taycan 2020 - 2024

Diagram ref no 1

The expansion tank accommodates changes in coolant volume as the thermal-management system heats and cools. It stores excess coolant from the closed circuit, helps the system manage pressure and provides a reserve supply as the coolant contracts. Maintaining the correct coolant level is essential to the stable operation of the Taycan’s temperature-control system.

Key Features and Benefits
•  MAHLE replacement cooling-system component
•  Supplied with coolant reservoir cap
•  Includes integrated coolant-level sensor
•  Direct cross-reference to Porsche 9J1121407A
•  Helps restore correct coolant containment and level monitoring
•  Designed for dependable, leak-free operation
•  Suitable for replacement of cracked, leaking or damaged tanks

Why Replacement Matters
A cracked or leaking expansion tank can cause coolant loss, prevent the system from maintaining the correct fluid level and compromise thermal-management performance. Prompt replacement helps protect the cooling circuit and supports stable temperature control for the vehicle’s electrical drivetrain systems.

When to Replace the Expansion Tank
•  Coolant is visible around the reservoir or its connections
•  The tank body is cracked, distorted or discoloured
•  A low-coolant warning remains after the coolant level is corrected
•  The integrated level sensor is faulty
•  The reservoir cap or sealing area is damaged
•  Coolant level falls repeatedly without an obvious external hose leak
•  During cooling-system repair or accident-damage restoration

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9J1121407A

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