Please wait… 
Please wait while we process your order,
do not press the back button…
do not press the back button…
Enter your VAT number here and click Verify:
Your details have been verified. VAT number registered to:
,
.
Your order will now be zero rated for VAT purposes. We reserve the right to verify these details after your order request has been made and reinstate VAT if required.
Your VAT details were not recognised or were invalid. Your VAT number must be matched to your Billing Country as specified above. This is currently specified as . You do not need to enter the country code part of your VAT number as this has already been selected in your billing address details above.
The VAT number checking service is currently offline. Please supply your VAT details within the comments or special instructions field below and we will apply a VAT discount after placing your order request.
Coolant Bottle Level Sensor. Porsche 987 Boxster / Cayman 2005-12 - 98764150300
98764150300
Vehicle Group
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Information
Coolant Bottle Level Sensor.
Symptoms Of Wear Or Failure:
Why Replacement Matters:
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98764150300
The product you are viewing cross references to these numbers
Maintain accurate coolant level monitoring and dependable cooling-system warnings with this Porsche Coolant Bottle Level Sensor, part number 98764150300. Designed for compatible Porsche applications, this sensor monitors the coolant level within the expansion/header tank and provides the vehicle's electronic systems with information when the coolant falls below the intended level.
Fits:
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Diagram Ref No 2
Maintaining sufficient coolant is essential for controlling engine temperature. A low coolant level can reduce the cooling system's ability to transfer heat effectively and may allow air to enter the system, potentially resulting in unstable temperatures or overheating.
The coolant level sensor provides an important early warning so that coolant loss can be investigated before it develops into a more serious cooling-system problem. Over time, the sensor can become unreliable through age, repeated heat cycles, contamination, electrical faults or damage to its connector and wiring.
Replacing a faulty sensor with the correct Porsche Coolant Bottle Level Sensor 98764150300 helps restore accurate coolant level detection and reliable operation of the vehicle's coolant warning system.
What This Product Does:
- Monitors coolant level within the expansion/header tank.
- Detects when coolant falls below the intended level.
- Sends coolant level information to the vehicle's monitoring system.
- Helps trigger a low coolant warning when required.
- Provides early indication of coolant loss.
- Helps the driver identify a potential cooling-system problem.
- Supports reliable engine temperature management.
- Helps prevent low coolant conditions from going unnoticed.
- Works as part of the vehicle's cooling-system warning arrangement.
- Replaces a damaged, inaccurate or failed coolant level sensor.
- Restores correct coolant level monitoring on compatible Porsche applications.
Symptoms Of Wear Or Failure:
- Low coolant warning despite the coolant being at the correct level.
- Coolant warning appearing intermittently.
- Warning remaining illuminated after the coolant level has been corrected.
- No low coolant warning when the level is genuinely low.
- Implausible coolant level information during diagnostic testing.
- Coolant level sensor-related fault codes where applicable.
- Warning appearing particularly when cornering or accelerating despite adequate coolant.
- Corroded or contaminated electrical connections.
- Damaged sensor wiring.
- Cracked or damaged electrical connector.
- Physical deterioration of the sensor.
- Sensor problems discovered during expansion tank servicing or replacement.
Why Replacement Matters:
- The coolant level sensor provides an important warning when the cooling system begins losing coolant. A faulty sensor can create problems in two different ways.
- If the sensor incorrectly reports a low level, it may produce persistent or intermittent dashboard warnings even when the cooling system is correctly filled. Apart from being inconvenient, repeated false warnings can make it more difficult to recognise a genuine cooling-system problem.
- More importantly, a sensor that fails to detect an actual low coolant condition can prevent the driver from receiving an early warning.
- Coolant loss may result from a leaking hose, radiator, expansion tank, water pump, seal or another cooling-system component. Continuing to drive with insufficient coolant can lead to poor circulation, air entering the cooling circuit and eventual engine overheating.
- Severe overheating can cause expensive engine damage, including deterioration of seals and gaskets and damage to major engine components.
- Replacing a defective sensor with the correct Porsche Coolant Bottle Level Sensor 98764150300 helps ensure the vehicle can accurately monitor coolant level and provide an appropriate warning when attention is required.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98764150300
98764150300
The product you are viewing cross references to these numbers
Price: £49.82
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