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Coolant Expansion Tank, LHD. Porsche 95B.2 Macan 2019-21 - 95B121407A
95B121407A/1
Vehicle Group
- Porsche 95B.2 Macan Petrol 2.0L (245Bhp) 2019-21
- Porsche 95B.2 Macan S Petrol 3.0L V6 (354Bhp) 2019-21
- Porsche 95B.2 Macan GTS Petrol 2.9L V6 (380Bhp) 2019-21
- Porsche 95B.2 Macan Turbo 2.9L V6 (440Bhp) 2019-21
Information
Coolant Expansion Tank, LHD.
Diagram Ref No 1
Symptoms Of Wear Or Failure:
Why Replacement Matters:
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95B121407A
The product you are viewing cross references to these numbers
Restore cooling-system integrity and reliable coolant management with this OE Match Coolant Expansion Tank, designed for compatible Left-Hand Drive (LHD) Porsche applications.
Fits:- Porsche 95B.2 Macan Petrol 2.0L (245Bhp) 2019-21
- Porsche 95B.2 Macan S Petrol 3.0L V6 (354Bhp) 2019-21
- Porsche 95B.2 Macan GTS Petrol 2.9L V6 (380Bhp) 2019-21
- Porsche 95B.2 Macan Turbo 2.9L V6 (440Bhp) 2019-21
Diagram Ref No 1
Also known as a coolant reservoir or header tank, the expansion tank is an important part of the engine cooling system. As the engine reaches operating temperature, the coolant heats up and expands. The expansion tank provides the necessary space to accommodate this change in coolant volume while forming part of the sealed, pressurised cooling circuit.
When the engine cools, the coolant contracts and the system returns towards its cold operating level. Because the tank is continually subjected to heat, pressure and repeated thermal cycles, its plastic construction can eventually become brittle, cracked or distorted. Seams and hose connection points can also deteriorate and begin leaking.
This OE Match Coolant Expansion Tank provides a high-quality replacement for a cracked, leaking or deteriorated original reservoir, helping restore correct coolant containment and dependable engine cooling.
What This Product Does:
- Stores the cooling system's reserve coolant.
- Accommodates coolant expansion as engine temperature rises.
- Helps manage changes in coolant volume during heating and cooling.
- Forms part of the sealed cooling circuit.
- Supports correct cooling-system pressure management.
- Provides a point for monitoring coolant level.
- Helps ensure sufficient coolant remains available to the cooling circuit.
- Works with the expansion tank cap and associated coolant hoses.
- Helps maintain reliable engine temperature control.
- Replaces a cracked, leaking or deteriorated coolant reservoir.
- Helps restore cooling-system integrity when tank failure is the cause
- Is specified for compatible LHD Porsche applications.
- Provides an OE Match alternative to the corresponding original component.
Symptoms Of Wear Or Failure:
- Visible coolant leaking from the tank.
- Repeatedly falling coolant level.
- Low coolant warning messages.
- Coolant collecting beneath the vehicle.
- Cracks in the expansion tank.
- Leakage along moulded tank seams.
- Leakage around hose connections.
- Dried coolant deposits around the reservoir.
- Sweet coolant smell around the vehicle.
- Plastic becoming brittle or heavily discoloured.
- Damage around tank mounting points.
- Coolant loss primarily when the engine is hot.
- Frequent need to top up the cooling system.
- Cooling system struggling to maintain pressure.
- Engine temperature running higher than normal.
- Steam or coolant vapour from the engine compartment in severe cases.
Why Replacement Matters:
- The coolant expansion tank operates as part of a hot, pressurised cooling system and must remain structurally sound and properly sealed.
- A small crack or deteriorated seam may initially leak only when the coolant reaches operating temperature and system pressure increases. This can make early leaks difficult to identify. As the tank continues through repeated heating and cooling cycles, minor damage can become progressively worse.
- Continued coolant loss reduces the quantity of fluid available to absorb and transfer engine heat. It can also allow air into the cooling circuit, potentially causing poor circulation, temperature fluctuations and localised overheating.
- If coolant loss becomes severe enough, the engine may overheat. Prolonged or significant overheating can result in expensive damage to seals, gaskets and major engine components.
- A damaged expansion tank can also interfere with the cooling system's ability to maintain its intended pressure. Correct pressure is important for effective cooling-system operation and for controlling the coolant's boiling characteristics at operating temperature.
- Replacing a defective reservoir with this OE Match Coolant Expansion Tank helps restore coolant containment, cooling-system integrity and reliable engine temperature management.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95B121407A
95B121407A
The product you are viewing cross references to these numbers
Price: £77.44
Orderable
Related products
Vehicle Group
- Porsche 9J1.1 Taycan 2020-24
- Porsche 9J1.1 Taycan Sport Turismo 2020-24
- Porsche 9J1.1 Taycan 4 Cross Turismo 2020-24
- Porsche 9J1.1 Taycan 4S 2020-24
- Porsche 9J1.1 Taycan 4S Cross Turismo 2020-24
- Porsche 9J1.1 Taycan 4S Sport Turismo 2020-24
- Porsche 9J1.1 Taycan GTS 2020-24
- Porsche 9J1.1 Taycan GTS Sport Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo 2020-24
- Porsche 9J1.1 Taycan Turbo Cross Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo Sport Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo S 2020-24
- Porsche 9J1.1 Taycan Turbo S Cross Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo S Sport Turismo 2020-24
Information
Coolant expansion tank bottle.
This genuine coolant expansion tank is the original-spec reservoir that forms part of the Taycan’s coolant system, responsible for managing coolant volume and pressure as the system heats and cools. Manufactured by Porsche to strict OEM standards.
Fits:
Porsche 9J1.1 Taycan 2020 - 2024
Diagram ref no 1
The coolant expansion/overflow reservoir for the Taycan’s coolant system. It collects and stores excess coolant from the closed-loop cooling circuit when temperature changes cause expansion. It also provides a visible coolant level reference and a refill point when topping-up is required.
This coolant tank:
• Accepts excess coolant as it expands under heat, preventing over-pressure in the cooling system.
• Allows coolant to return to the system when temperatures drop, helping maintain proper coolant volume and pressure.
• Provides a clean, secure housing that resists heat, pressure, and coolant chemistry - preventing leaks and degradation.
• Maintains correct coolant level and system integrity, vital for thermal management of batteries, motors, and inverter cooling.
When to replace. You should consider replacing the coolant expansion tank if:
• The original shows cracks, discoloration, deformation, or leaks.
• Coolant level drops unexpectedly without visible external leak - indicating internal crack or cap failure.
• The tank becomes brittle, warped, or chemically aged due to coolant exposure and heat cycles.
• You are restoring or servicing the cooling system, or performing maintenance/replacement of hoses, pumps or thermal components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9J1121407A
The product you are viewing cross references to these numbers
This genuine coolant expansion tank is the original-spec reservoir that forms part of the Taycan’s coolant system, responsible for managing coolant volume and pressure as the system heats and cools. Manufactured by Porsche to strict OEM standards.
Fits:
Porsche 9J1.1 Taycan 2020 - 2024
Diagram ref no 1
The coolant expansion/overflow reservoir for the Taycan’s coolant system. It collects and stores excess coolant from the closed-loop cooling circuit when temperature changes cause expansion. It also provides a visible coolant level reference and a refill point when topping-up is required.
This coolant tank:
• Accepts excess coolant as it expands under heat, preventing over-pressure in the cooling system.
• Allows coolant to return to the system when temperatures drop, helping maintain proper coolant volume and pressure.
• Provides a clean, secure housing that resists heat, pressure, and coolant chemistry - preventing leaks and degradation.
• Maintains correct coolant level and system integrity, vital for thermal management of batteries, motors, and inverter cooling.
When to replace. You should consider replacing the coolant expansion tank if:
• The original shows cracks, discoloration, deformation, or leaks.
• Coolant level drops unexpectedly without visible external leak - indicating internal crack or cap failure.
• The tank becomes brittle, warped, or chemically aged due to coolant exposure and heat cycles.
• You are restoring or servicing the cooling system, or performing maintenance/replacement of hoses, pumps or thermal components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9J1121407A
9J1121407A
The product you are viewing cross references to these numbers
Price: £124.89
Orderable
Vehicle Group
- Porsche 9J1.1 Taycan 2020-24
- Porsche 9J1.1 Taycan Sport Turismo 2020-24
- Porsche 9J1.1 Taycan 4 Cross Turismo 2020-24
- Porsche 9J1.1 Taycan 4S 2020-24
- Porsche 9J1.1 Taycan 4S Cross Turismo 2020-24
- Porsche 9J1.1 Taycan 4S Sport Turismo 2020-24
- Porsche 9J1.1 Taycan GTS 2020-24
- Porsche 9J1.1 Taycan GTS Sport Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo 2020-24
- Porsche 9J1.1 Taycan Turbo Cross Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo Sport Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo S 2020-24
- Porsche 9J1.1 Taycan Turbo S Cross Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo S Sport Turismo 2020-24
Information
Coolant expansion tank bottle
OE Match coolant expansion (overflow) tank that forms part of the Taycan’s closed cooling system. It serves as a buffer reservoir for coolant volume changes caused by temperature fluctuations in the system. It also provides a visible coolant level reference and a fill point for maintenance. As a direct-fit replacement, it integrates with the factory hoses, clamps, and sensors without modification.
Fits:
Porsche 9J1.1 Taycan 2020 - 2024
Diagram ref no 1
The coolant expansion/overflow reservoir for the Taycan’s coolant system. It collects and stores excess coolant from the closed-loop cooling circuit when temperature changes cause expansion. It also provides a visible coolant level reference and a refill point when topping-up is required.
This coolant tank:
• Accepts expanding coolant when temperature rises, preventing over-pressure in the cooling circuit.
• Stores slightly extra coolant, which returns to the main system when temperatures drop - maintaining consistent coolant levels.
• Provides a safe, sealed reservoir that resists coolant chemistry, temperature, and vibration - preventing leaks or contamination.
• Offers a sight-glass or translucent body (or level markings), making coolant level checks simple and straightforward for maintenance.
Over time, coolant expansion tanks may develop cracks, stress fractures or leaks due to pressure cycling, temperature variation, or material fatigue - particularly in high-performance or electric cooling systems. If the expansion tank fails, you risk coolant leaks, pressure loss, overheating or inadequate coolant circulation.
An OE Match replacement restores proper system pressure management, coolant containment, and leak-free operation. It protects the drivetrain’s thermal management integrity, supports battery/motor cooling stability, and helps prevent costly damage or component failure.
When to Replace Consider replacing the expansion tank if:
• The original shows visible cracks, deformation, or plastic fatigue.
• There is coolant loss or leakage under the car or around the reservoir.
• The system shows erratic coolant-level changes or pressure anomalies.
• You are performing cooling-system maintenance, overhaul, or upgrades.
• You notice discoloration, brittleness, or internal contamination in the tank material.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9J1121407A
The product you are viewing cross references to these numbers
OE Match coolant expansion (overflow) tank that forms part of the Taycan’s closed cooling system. It serves as a buffer reservoir for coolant volume changes caused by temperature fluctuations in the system. It also provides a visible coolant level reference and a fill point for maintenance. As a direct-fit replacement, it integrates with the factory hoses, clamps, and sensors without modification.
Fits:
Porsche 9J1.1 Taycan 2020 - 2024
Diagram ref no 1
The coolant expansion/overflow reservoir for the Taycan’s coolant system. It collects and stores excess coolant from the closed-loop cooling circuit when temperature changes cause expansion. It also provides a visible coolant level reference and a refill point when topping-up is required.
This coolant tank:
• Accepts expanding coolant when temperature rises, preventing over-pressure in the cooling circuit.
• Stores slightly extra coolant, which returns to the main system when temperatures drop - maintaining consistent coolant levels.
• Provides a safe, sealed reservoir that resists coolant chemistry, temperature, and vibration - preventing leaks or contamination.
• Offers a sight-glass or translucent body (or level markings), making coolant level checks simple and straightforward for maintenance.
Over time, coolant expansion tanks may develop cracks, stress fractures or leaks due to pressure cycling, temperature variation, or material fatigue - particularly in high-performance or electric cooling systems. If the expansion tank fails, you risk coolant leaks, pressure loss, overheating or inadequate coolant circulation.
An OE Match replacement restores proper system pressure management, coolant containment, and leak-free operation. It protects the drivetrain’s thermal management integrity, supports battery/motor cooling stability, and helps prevent costly damage or component failure.
When to Replace Consider replacing the expansion tank if:
• The original shows visible cracks, deformation, or plastic fatigue.
• There is coolant loss or leakage under the car or around the reservoir.
• The system shows erratic coolant-level changes or pressure anomalies.
• You are performing cooling-system maintenance, overhaul, or upgrades.
• You notice discoloration, brittleness, or internal contamination in the tank material.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9J1121407A
9J1121407A
The product you are viewing cross references to these numbers
Price: £42.90
In stock
Vehicle Group
- Porsche 9J1.1 Taycan 2020-24
- Porsche 9J1.1 Taycan Sport Turismo 2020-24
- Porsche 9J1.1 Taycan 4 Cross Turismo 2020-24
- Porsche 9J1.1 Taycan 4S 2020-24
- Porsche 9J1.1 Taycan 4S Cross Turismo 2020-24
- Porsche 9J1.1 Taycan 4S Sport Turismo 2020-24
- Porsche 9J1.1 Taycan GTS 2020-24
- Porsche 9J1.1 Taycan GTS Sport Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo 2020-24
- Porsche 9J1.1 Taycan Turbo Cross Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo Sport Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo S 2020-24
- Porsche 9J1.1 Taycan Turbo S Cross Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo S Sport Turismo 2020-24
Information
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
The product you are viewing cross references to these numbers
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
9J1121407A
The product you are viewing cross references to these numbers
Price: £65.00
Orderable