CAP EXPANSION TANK 1.4BAR

Name: CAP EXPANSION TANK 1.4BAR
SKU: 408868
Price: 138 ZAR
Availability: InStock

SKU: 408868

Category: BRAND NEW, COOLING, PRESSURE CAP

R138,00 incl. 15% VAT

✓ In stock, ships nationwide via The Courier Guy

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Fitment: Fits selected models across BMW and Toyota. Confirm exact fitment before ordering.

Product Description

Keep your vehicle's cooling system operating efficiently with this brand new CAP EXPANSION TANK 1.4BAR, designed for BMW and Toyota models. This pressure cap is a crucial part of the cooling system, maintaining the correct pressure in the expansion tank to prevent overheating and coolant loss. It features a robust plastic construction with clear warning and informational symbols for safe handling and proper installation.

This cap is suitable for select BMW 2, 3, 4, 5, and 7 Series models (including 220i to 740d with B46, B47, B48, B57, and B58 engines from 2018 onwards) and compatible Toyota vehicles. Always confirm your vehicle’s model, year, engine size, and engine code before ordering to ensure the correct fit.

Common symptoms of a failing expansion tank cap include coolant leaks around the cap, overheating, fluctuating coolant levels, or warning lights on your dashboard. If you notice hissing sounds, visible cracks, or a loose fit, it’s likely time for a replacement.

Replacing a faulty pressure cap is essential to maintain the correct system pressure, prevent coolant loss, and avoid engine overheating. It is a straightforward replacement, but always ensure the engine is cool before removing the cap, and check your owner’s manual for the correct pressure rating.

MiMi Auto Parts supplies quality new parts and offers nationwide delivery across South Africa. Trust us to help you keep your cooling system in top condition—contact us if you need assistance confirming fitment for your specific vehicle.

Common signs this part may need replacement

Coolant leaking from the expansion tank area
Engine overheating
Coolant warning light illuminated on dashboard
Fluctuating or dropping coolant levels
Hissing sound from the cap after engine shutdown
Visible cracks or damage on the cap
Loose or poor cap fit
Air bubbles in the coolant reservoir
Difficulty maintaining system pressure

Typical replacement guidance

Replace the expansion tank pressure cap if you notice leaks, overheating, or any signs of pressure loss. Ensure the replacement cap matches your vehicle’s required pressure rating (1.4 bar) and only replace when the engine is cool.

Why timely replacement matters

A faulty expansion tank cap can lead to loss of coolant and engine overheating, risking severe engine damage. Timely replacement helps maintain correct pressure and reliable cooling system performance.

Vehicle Compatibility

This part is confirmed to fit the following vehicles:

BMW 2 Coupe (G42, G87) 2021 – 2026 220 i (B48 B20 A) – 135 kW / 184 HP
BMW 2 Coupe (G42, G87) 2021 – 2026 M240 i xDrive (B58 B30 B) – 275 kW / 374 HP
BMW 3 (G20, G80, G28) 2018 – 2026 318 i (B48 B20 A) – 115 kW / 156 HP
BMW 3 (G20, G80, G28) 2018 – 2026 320 e Plug-in-Hybrid (B48 B20 A|GC1) – 120 kW / 163 HP
BMW 3 (G20, G80, G28) 2018 – 2026 320 e Plug-in-Hybrid (B48 B20 A|GC1) – 150 kW / 204 HP
BMW 3 (G20, G80, G28) 2018 – 2026 320 i (B46 B20 B|B48 B20 A|B48 B20 B) – 135 kW / 184 HP
BMW 3 (G20, G80, G28) 2018 – 2026 320 i 1.6 (B48 B16 A) – 125 kW / 170 HP
BMW 3 (G20, G80, G28) 2018 – 2026 320 i xDrive (B48 B20 A) – 135 kW / 184 HP
BMW 3 (G20, G80, G28) 2018 – 2026 330 e Plug-in-Hybrid (B46 B20 B|B48 B20 A|B48 B20 B|GC1) – 215 kW / 292 HP
BMW 3 (G20, G80, G28) 2018 – 2026 330 e Plug-in-Hybrid (B46 B20 B|B48 B20 A|GC1) – 135 kW / 184 HP
BMW 3 (G20, G80, G28) 2018 – 2026 330 e Plug-in-Hybrid (B46 B20 B|B48 B20 A|GC1) – 185 kW / 252 HP
BMW 3 (G20, G80, G28) 2018 – 2026 330 e Plug-in-Hybrid xDrive (B48 B20 A|GC1) – 135 kW / 184 HP
BMW 3 (G20, G80, G28) 2018 – 2026 330 e Plug-in-Hybrid xDrive (B48 B20 A|GC1) – 215 kW / 292 HP
BMW 3 (G20, G80, G28) 2018 – 2026 330 i (B46 B20 B|B48 B20 B) – 190 kW / 258 HP
BMW 3 (G20, G80, G28) 2018 – 2026 330 i xDrive (B46 B20 B|B48 B20 B) – 190 kW / 258 HP
BMW 3 (G20, G80, G28) 2018 – 2026 330 Li (B48 B20 B) – 190 kW / 255 HP
BMW 3 (G20, G80, G28) 2018 – 2026 M 340 i (B58 B30 B) – 285 kW / 387 HP
BMW 3 (G20, G80, G28) 2018 – 2026 M 340 i Mild-Hybrid xDrive (B58 B30 B|JA1) – 275 kW / 374 HP
BMW 3 (G20, G80, G28) 2018 – 2026 M 340 i xDrive (B58 B30 B) – 275 kW / 374 HP
BMW 3 (G20, G80, G28) 2018 – 2026 M 340 i xDrive (B58 B30 B) – 285 kW / 387 HP
BMW 3 (G20, G80, G28) 2018 – 2026 M340 d Mild-Hybrid xDrive (B57 D30 B|JA1) – 250 kW / 340 HP
BMW 4 Convertible (G23, G83) 2020 – 2026 420 i (B46 B20 B|B48 B20 A) – 135 kW / 184 HP
BMW 4 Convertible (G23, G83) 2020 – 2026 430 i () – 180 kW / 245 HP
BMW 4 Convertible (G23, G83) 2020 – 2026 430 i () – 190 kW / 258 HP
BMW 4 Convertible (G23, G83) 2020 – 2026 430 i xDrive (B48 B20 B) – 180 kW / 245 HP
BMW 4 Convertible (G23, G83) 2020 – 2026 M 440 i Mild-Hybrid (B58 B30 B) – 275 kW / 374 HP
BMW 4 Convertible (G23, G83) 2020 – 2026 M 440 i Mild-Hybrid xDrive (B58 B30 B|JA1) – 275 kW / 374 HP
BMW 4 Convertible (G23, G83) 2020 – 2026 M 440 i Mild-Hybrid xDrive (B58 B30 B|JA1) – 285 kW / 387 HP
BMW 4 Coupe (G22, G82) 2020 – 2026 420 i (B46 B20 B|B48 B20 A) – 135 kW / 184 HP
BMW 4 Coupe (G22, G82) 2020 – 2026 430 i (B46 B20 B|B48 B20 B) – 190 kW / 258 HP
BMW 4 Coupe (G22, G82) 2020 – 2026 M 440 i Mild-Hybrid xDrive (B58 B30 B|JA1) – 275 kW / 374 HP
BMW 4 Coupe (G22, G82) 2020 – 2026 M 440 i Mild-Hybrid xDrive (B58 B30 B|JA1) – 285 kW / 387 HP
BMW 4 Gran Coupe (G26) 2021 – 2026 420 i (B46 B20 B|B48 B20 A) – 135 kW / 184 HP
BMW 4 Gran Coupe (G26) 2021 – 2026 M440 i Mild-Hybrid xDrive (B58 B30 B) – 285 kW / 387 HP
BMW 5 (G60, G90, G68) 2023 – 2026 520 d Mild-Hybrid (B47 D20 B|JA1) – 145 kW / 197 HP
BMW 7 (G70) 2022 – 2026 740 i, Li Mild Hybrid (B58 B30 P) – 280 kW / 381 HP
BMW 7 (G70) 2022 – 2026 740d xDrive (B57 D30 B) – 220 kW / 299 HP
BMW 7 (G70) 2022 – 2026 M 760e Plug-in Hybrid xDrive (B58 B30 P) – 420 kW / 571 HP
BMW Z4 Roadster (G29) 2018 – 2026 M40 i (B58 B30 C) – 250 kW / 340 HP
BMW Z4 Roadster (G29) 2018 – 2026 sDrive 20 i (B46 B20 B|B48 B20 B) – 145 kW / 197 HP
TOYOTA SUPRA (DB_) 2019 – 2026 3.0 GR (DB41, DB42, DB43, DB45, DB46) (B58) – 250 kW / 340 HP

Fitment support

Not sure if this part fits your vehicle? Contact MiMi Auto Parts with your vehicle make, model, year, and engine code before ordering and we will help confirm fitment.

Installation note

Cooling system work involves draining and refilling coolant and may require specialised tools. Professional installation is recommended to ensure correct coolant mixture, bleeding of air from the system, and leak-free connections.

Frequently Asked Questions

What are the signs of a failing water pump?

Common signs may include coolant leaks near the front of the engine, engine overheating, a whining or grinding noise from the water pump area, or coolant loss without visible external leaks. Diagnosis should be confirmed before replacement.

Can I drive with a coolant leak?

Driving with a coolant leak is not recommended. Loss of coolant can lead to engine overheating and potentially serious engine damage. The vehicle should be inspected and the leak repaired before further driving.

Does this part fit my vehicle?

Please check the vehicle compatibility section on this page and confirm your vehicle make, model, year, engine size, and engine code before ordering. If you are unsure, contact MiMi Auto Parts before checkout.

Is the price VAT-inclusive?

Yes, product prices on MiMi Auto Parts are shown inclusive of VAT where applicable.

Do you deliver across South Africa?

Yes, MiMi Auto Parts delivers nationwide in South Africa. Delivery cost and estimated timing are calculated during checkout based on your location.

Is professional installation recommended?

Professional installation is recommended for safety-critical and technical parts such as airbag, clock spring, brakes, suspension, steering, clutch, cooling, engine, and electrical components. For guidance specific to this part, see the installation note on this page.