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Porsche // 991 (911) MK2 2016-2019 // 991.2 Cabriolet 4S / GTS 3.0L (420/450 Bhp) 2016-19
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Coolant expansion tank bottle. Porsche 9J1.1 Taycan 2020-24 - 9J1121407A
9J1121407A/2
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
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Coolant / Antifreeze 1Ltr Top-up Bottle - Long Life 5 Year Red
Anti Freeze, please check your vehicle handbook for applications
Mix 50/50 with distilled water for best results.
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Anti Freeze, please check your vehicle handbook for applications
Mix 50/50 with distilled water for best results.
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Information
Water reservoir bleeder valve.
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Diagram ref no 3
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Diagram ref no 3
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- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
Information
Water Tank Reservoir.
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This part number supersedes following numbers:
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- 99110615704
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
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This part number supersedes following numbers:
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Click 'Zoom in' for large parts diagram.
Diagram ref no 1
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- Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
- Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
- Porsche 991.1 R 4.0L (500 Bhp) 2016
- Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
- Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
- Porsche 991.2 Carrera 2 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Carrera 2S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Carrera 4S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 2S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 4S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Targa 4S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
- Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
- Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
- Porsche Cayman 2.7L 981 2013-16
- Porsche Cayman S / GTS 3.4L 981 2013-16
- Porsche Cayman GT4 3.8L 2015-16
- Porsche Cayman 718 2.0L Manual (300 Bhp)
- Porsche Cayman 718 2.0L PDK (300 Bhp)
- Porsche Cayman S 718 2.5L Manual (350 Bhp)
- Porsche Cayman S 718 2.5L PDK (350 Bhp)
- Porsche 970.1 Panamera V6 3.6L 2WD 2009-13
- Porsche 970.1 Panamera 4 V6 3.6L 4WD 2009-13
- Porsche 970.1 Panamera S V8 4.8L 2009-13
- Porsche 970.1 Panamera 4S V8 4.8L 2009-13
- Porsche 970.1 Panamera GTS V8 4.8L 2011-13
- Porsche 970.1 Panamera Turbo V8 4.8L 2009-13
- Porsche 970.1 Panamera Turbo S V8 4.8L 2009-13
- Porsche 970.1 Panamera Diesel V6 3.0L 2011-13
- Porsche 970.1 Panamera S Hybrid V6 3.0L 2011-13
- Porsche 970.2 Panamera V6 3.6L 2WD (310Hp) 2014-16
- Porsche 970.2 Panamera 4 V6 3.6L 4WD (310Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD (420Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD Executive 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD (420Hp) 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD Executive 2014-16
- Porsche 970.2 Panamera GTS V8 4.8L 4WD (440Hp) 2014-16
- Porsche 970.2 Panamera Turbo V8 4.8L (520Hp) 2014-16
- Porsche 970.2 Panamera Turbo V8 Executive 2014-16
- Porsche 970.2 Panamera Turbo S V8 4.8L 2014-16
- Porsche 970.2 Panamera Diesel V6 3.0L (250Hp) 2014-16
- Porsche 970.2 Panamera S E-Hybrid V6 3.0L (416Hp) 2014-16
Information
Coolant Bottle Level Sensor
Restore reliable coolant level monitoring with this OE Match
Coolant Bottle Level Sensor. The coolant level sensor monitors the amount of coolant
within the expansion tank and allows the vehicle's warning system to alert the
driver if the coolant level falls too low.
Fits:
- Porsche 981 Boxster 2012-16
- Porsche 718 (982) Boxster 2017>>
- Porsche 981 Cayman 2012-16
- Porsche 718 (982) Cayman 2017>>
- Porsche 991.1 2012-16
- Porsche 991.2 2017>>
- Porsche 970 Panamera 2010-16
Diagram ref no 12
A faulty sensor can cause incorrect low-coolant warnings or may fail to report a genuine drop in coolant level. Replacing a defective sensor restores an important part of the cooling system's monitoring and warning function.
What Does the Coolant Bottle Level Sensor Do?
The coolant level sensor is fitted to the coolant expansion tank, also commonly referred to as the coolant bottle or reservoir.
Its job is to monitor whether the coolant is at the required level. If the level falls below the specified point, the sensor communicates this to the vehicle's electronics so a warning can be displayed to the driver.
A correctly functioning coolant level sensor helps:
- Monitor coolant level within the expansion tank
- Alert the driver when coolant becomes too low
- Provide early warning of coolant loss
- Reduce the risk of driving with insufficient coolant
- Support correct operation of the cooling system warning functions
The sensor does not measure engine temperature and does not control coolant flow. Its purpose is specifically to monitor coolant level.
Why Is Coolant Level Monitoring Important?
The engine cooling system relies on having the correct quantity of coolant circulating through the engine, radiators and associated components.
A falling coolant level can indicate a leak or another cooling system problem. If coolant loss continues unnoticed, the cooling system may become unable to control engine temperature effectively.
The coolant level sensor therefore provides an important early warning, allowing the cooling system to be inspected before a low coolant condition develops into a more serious problem.
Why Do Coolant Level Sensors Fail?
Coolant level sensors operate in a demanding environment and can deteriorate with age and repeated heating and cooling cycles.
Common causes of failure include:
- Age-related electrical deterioration
- Repeated temperature cycling
- Internal sensor failure
- Coolant contamination or deposits
- Corrosion at electrical connections
- Damaged wiring or connectors
- Damage during expansion tank removal or replacement
A problem with the expansion tank, wiring or electrical connector can produce similar symptoms, so these components should also be inspected before replacing the sensor.
When Should the Coolant Level Sensor Be Replaced?
Replacement should be considered if:
- A low coolant warning remains on despite the coolant being at the correct level
- Low coolant warnings appear intermittently without an actual loss of coolant
- The sensor fails diagnostic testing
- The sensor or electrical connection is physically damaged
- Corrosion is present around the connection
- The sensor has been damaged during cooling system maintenance
- The coolant expansion tank is being replaced and the existing sensor is no longer serviceable
If the vehicle displays a low coolant warning, the actual coolant level should always be checked first. A warning should not automatically be assumed to be caused by a faulty sensor.
Important Cooling System Checks
If the coolant level is genuinely low, the cause should be investigated rather than simply topping up the expansion tank.
Potential coolant loss can occur from components such as hoses, expansion tanks, radiators, water pumps, seals and other cooling system connections.
Replacing the level sensor is appropriate when the sensor itself has been identified as faulty.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
97060650300
970 606 503 00
97060650300
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