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Expansion Tank Cap
The expansion tank cap regulates the pressure of the entire cooling system. Over time, the cap can become ineffective or begin leaking from its seals.
Description
The coolant expansion tank cap maintains the necessary pressure in your cooling system, ensuring everything runs effectively. But over time the seal can weaken or deform, gradually leaking coolant and leading to overheating issues. Thousands of heat cycles can also cause the caps to form to the unique shape of the old tank, and we often see customers replace their expansion tank only to experience issues with their old cap not sealing properly. With this in mind, we always recommend ordering a replacement cap when replacing your expansion tank. These are repackaged BMW Genuine expansion tank caps that have the logo etched off.
Helpful tips
The expansion tank cap also acts as a safety valve, designed to release pressure before your hoses, fittings, and radiator bursts.
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Confirmed fit
Fits your
Fits your
Check before ordering:
One detail to check, depending on your body type
All12.90 to 09.98
All01.90 to 06.98
All02.91 to 05.99
All01.90 to 05.98
All07.94 to 05.98
All01.90 to 07.95
All03.95 to 08.99
All03.92 to 08.99
Compact03.94 to 08.00
Sedan07.98 to 02.05
Sedan07.98 to 02.05
Touring07.98 to 02.05
Sedan03.98 to 08.00
Sedan09.00 to 02.05
Sedan03.98 to 08.00
Sedan09.00 to 02.05
Coupe04.99 to 05.06
Coupe04.99 to 08.00
Coupe01.00 to 05.06
Coupe04.99 to 08.00
Coupe01.00 to 05.06
Convertible02.00 to 08.06
Convertible02.00 to 08.06
Coupe10.00 to 05.06
Convertible10.00 to 05.06
Compact03.00 to 12.04
Compact03.01 to 12.04
Compact03.00 to 12.04
Sedan11.95 to 09.00
Sedan09.00 to 06.03
Sedan11.95 to 09.00
Touring01.97 to 09.00
Sedan09.00 to 06.03
Touring09.00 to 05.04
Sedan04.96 to 06.03
Sedan04.96 to 06.03
Sedan10.98 to 06.03
Sedan01.96 to 11.01
Sedan01.96 to 11.01
Sedan10.94 to 11.01
Sedan10.94 to 11.01
Sedan10.94 to 11.01
Sedan10.94 to 11.01
Sedan11.01 to 02.05
Sedan06.04 to 07.08
Sedan11.01 to 02.05
Sedan06.04 to 07.08
Sedan02.02 to 07.08
Sedan11.01 to 02.05
Sedan09.04 to 07.08
Sedan11.01 to 02.05
Sedan06.04 to 07.08
Sedan02.02 to 07.08
All01.95 to 03.99
All04.99 to 01.03
All08.00 to 01.03
All04.97 to 06.00
All06.00 to 01.03
All03.97 to 01.03
All02.03 to 12.05
All01.06 to 08.08
All02.03 to 12.05
All01.06 to 08.08
All03.06 to 08.08
SUV01.04 to 07.06
SUV01.04 to 07.06
SUV09.06 to 08.10
SUV09.06 to 08.10
SUV05.00 to 09.06
SUV05.00 to 09.06
SUV02.02 to 04.04
SUV04.04 to 09.06
Matched to Australian-delivered models from the factory. Aftermarket modifications and grey imports may differ.
How we work
Matched to Australian-delivered modelsNot a global catalogue. Every fitment is mapped to AU specifications.
One price, for everyoneOur price is our best and only price. No seasonal sales, no discount codes.
Carefully curated rangeNot every part we can find — only ones we'd fit ourselves.
OE and OEM-quality suppliersThe same manufacturers that supply the European factories.
Specifications
- Manufacturer
- Rein
- Made in
- Germany
- Required per car
- 1
Part numbers
- OEM
- 17111742231
- Alternative
- 17117639022
- Alternative
- 17111712669
- Alternative
- 17111712492
- Rein
- CPE0030P
Part numbers are provided for reference only. For correct compatibility to your vehicle, please follow our fitment advice.
Fitments
9 chassis groups · 72 fitments
Browsing all compatible vehicles — to confirm fit.
| Model | Body | Build | Fitment notes |
|---|---|---|---|
| BMW 3 Series E36 (1990 - 1999) 316i All | All | 12.90 to 09.98 | |
| BMW 3 Series E36 (1990 - 1999) 318i All | All | 01.90 to 06.98 | |
| BMW 3 Series E36 (1990 - 1999) 318is All | All | 02.91 to 05.99 | |
| BMW 3 Series E36 (1990 - 1999) 320i All | All | 01.90 to 05.98 | |
| BMW 3 Series E36 (1990 - 1999) 323i All | All | 07.94 to 05.98 | |
| BMW 3 Series E36 (1990 - 1999) 325i All | All | 01.90 to 07.95 | |
| BMW 3 Series E36 (1990 - 1999) 328i All | All | 03.95 to 08.99 | |
| BMW 3 Series E36 (1990 - 1999) M3 All | All | 03.92 to 08.99 | |
| BMW 3 Series E36 (1990 - 1999) 318ti Compact | Compact | 03.94 to 08.00 |
| Model | Body | Build | Fitment notes |
|---|---|---|---|
| BMW 3 Series E46 (1998 - 2006) 318i Sedan | Sedan | 07.98 to 02.05 | |
| BMW 3 Series E46 (1998 - 2006) 320i Sedan | Sedan | 07.98 to 02.05 | |
| BMW 3 Series E46 (1998 - 2006) 320i Touring | Touring | 07.98 to 02.05 | |
| BMW 3 Series E46 (1998 - 2006) 323i Sedan | Sedan | 03.98 to 08.00 | |
| BMW 3 Series E46 (1998 - 2006) 325i Sedan | Sedan | 09.00 to 02.05 | |
| BMW 3 Series E46 (1998 - 2006) 328i Sedan | Sedan | 03.98 to 08.00 | |
| BMW 3 Series E46 (1998 - 2006) 330i Sedan | Sedan | 09.00 to 02.05 | |
| BMW 3 Series E46 (1998 - 2006) 320Ci Coupe | Coupe | 04.99 to 05.06 | |
| BMW 3 Series E46 (1998 - 2006) 323Ci Coupe | Coupe | 04.99 to 08.00 | |
| BMW 3 Series E46 (1998 - 2006) 325Ci Coupe | Coupe | 01.00 to 05.06 | |
| BMW 3 Series E46 (1998 - 2006) 328Ci Coupe | Coupe | 04.99 to 08.00 | |
| BMW 3 Series E46 (1998 - 2006) 330Ci Coupe | Coupe | 01.00 to 05.06 | |
| BMW 3 Series E46 (1998 - 2006) 325Ci Convertible | Convertible | 02.00 to 08.06 | |
| BMW 3 Series E46 (1998 - 2006) 330Ci Convertible | Convertible | 02.00 to 08.06 | |
| BMW 3 Series E46 (1998 - 2006) M3 Coupe | Coupe | 10.00 to 05.06 | |
| BMW 3 Series E46 (1998 - 2006) M3 Convertible | Convertible | 10.00 to 05.06 | |
| BMW 3 Series E46 (1998 - 2006) 316ti Compact | Compact | 03.00 to 12.04 | |
| BMW 3 Series E46 (1998 - 2006) 318ti Compact | Compact | 03.01 to 12.04 | |
| BMW 3 Series E46 (1998 - 2006) 325ti Compact | Compact | 03.00 to 12.04 |
| Model | Body | Build | Fitment notes |
|---|---|---|---|
| BMW 5 Series E39 (1995 - 2003) 523i Sedan | Sedan | 11.95 to 09.00 | |
| BMW 5 Series E39 (1995 - 2003) 525i Sedan | Sedan | 09.00 to 06.03 | |
| BMW 5 Series E39 (1995 - 2003) 528i Sedan | Sedan | 11.95 to 09.00 | |
| BMW 5 Series E39 (1995 - 2003) 528i Touring | Touring | 01.97 to 09.00 | |
| BMW 5 Series E39 (1995 - 2003) 530i Sedan | Sedan | 09.00 to 06.03 | |
| BMW 5 Series E39 (1995 - 2003) 530i Touring | Touring | 09.00 to 05.04 | |
| BMW 5 Series E39 (1995 - 2003) 535i Sedan | Sedan | 04.96 to 06.03 | |
| BMW 5 Series E39 (1995 - 2003) 540i Sedan | Sedan | 04.96 to 06.03 | |
| BMW 5 Series E39 (1995 - 2003) M5 Sedan | Sedan | 10.98 to 06.03 |
| Model | Body | Build | Fitment notes |
|---|---|---|---|
| BMW 7 Series E38 (1995 - 2002) 735i Sedan | Sedan | 01.96 to 11.01 | |
| BMW 7 Series E38 (1995 - 2002) 735iL Sedan | Sedan | 01.96 to 11.01 | |
| BMW 7 Series E38 (1995 - 2002) 740i Sedan | Sedan | 10.94 to 11.01 | |
| BMW 7 Series E38 (1995 - 2002) 740iL Sedan | Sedan | 10.94 to 11.01 | |
| BMW 7 Series E38 (1995 - 2002) 750i Sedan | Sedan | 10.94 to 11.01 | |
| BMW 7 Series E38 (1995 - 2002) 750iL Sedan | Sedan | 10.94 to 11.01 |
| Model | Body | Build | Fitment notes |
|---|---|---|---|
| BMW 7 Series E65/E66 (2002 - 2008) 735i Sedan | Sedan | 11.01 to 02.05 | |
| BMW 7 Series E65/E66 (2002 - 2008) 740i Sedan | Sedan | 06.04 to 07.08 | |
| BMW 7 Series E65/E66 (2002 - 2008) 745i Sedan | Sedan | 11.01 to 02.05 | |
| BMW 7 Series E65/E66 (2002 - 2008) 750i Sedan | Sedan | 06.04 to 07.08 | |
| BMW 7 Series E65/E66 (2002 - 2008) 760i Sedan | Sedan | 02.02 to 07.08 | |
| BMW 7 Series E65/E66 (2002 - 2008) 735Li Sedan | Sedan | 11.01 to 02.05 | |
| BMW 7 Series E65/E66 (2002 - 2008) 740Li Sedan | Sedan | 09.04 to 07.08 | |
| BMW 7 Series E65/E66 (2002 - 2008) 745Li Sedan | Sedan | 11.01 to 02.05 | |
| BMW 7 Series E65/E66 (2002 - 2008) 750Li Sedan | Sedan | 06.04 to 07.08 | |
| BMW 7 Series E65/E66 (2002 - 2008) 760Li Sedan | Sedan | 02.02 to 07.08 |
| Model | Body | Build | Fitment notes |
|---|---|---|---|
| BMW Z3 E36/7 (1996 - 2002) 1.9i All | All | 01.95 to 03.99 | |
| BMW Z3 E36/7 (1996 - 2002) 2.0i All | All | 04.99 to 01.03 | |
| BMW Z3 E36/7 (1996 - 2002) 2.2i All | All | 08.00 to 01.03 | |
| BMW Z3 E36/7 (1996 - 2002) 2.8i All | All | 04.97 to 06.00 | |
| BMW Z3 E36/7 (1996 - 2002) 3.0i All | All | 06.00 to 01.03 | |
| BMW Z3 E36/7 (1996 - 2002) M All | All | 03.97 to 01.03 |
| Model | Body | Build | Fitment notes |
|---|---|---|---|
| BMW Z4 E85/E86 (2003 - 2008) 2.5i All | All | 02.03 to 12.05 | |
| BMW Z4 E85/E86 (2003 - 2008) 2.5si All | All | 01.06 to 08.08 | |
| BMW Z4 E85/E86 (2003 - 2008) 3.0i All | All | 02.03 to 12.05 | |
| BMW Z4 E85/E86 (2003 - 2008) 3.0si All | All | 01.06 to 08.08 | |
| BMW Z4 E85/E86 (2003 - 2008) M All | All | 03.06 to 08.08 |
| Model | Body | Build | Fitment notes |
|---|---|---|---|
| BMW X3 E83 (2004 - 2010) 2.5i SUV | SUV | 01.04 to 07.06 | |
| BMW X3 E83 (2004 - 2010) 3.0i SUV | SUV | 01.04 to 07.06 | |
| BMW X3 E83 (2004 - 2010) 2.5si SUV | SUV | 09.06 to 08.10 | |
| BMW X3 E83 (2004 - 2010) 3.0si SUV | SUV | 09.06 to 08.10 |
| Model | Body | Build | Fitment notes |
|---|---|---|---|
| BMW X5 E53 (2001 - 2006) 3.0i SUV | SUV | 05.00 to 09.06 | |
| BMW X5 E53 (2001 - 2006) 4.4i SUV | SUV | 05.00 to 09.06 | |
| BMW X5 E53 (2001 - 2006) 4.6is SUV | SUV | 02.02 to 04.04 | |
| BMW X5 E53 (2001 - 2006) 4.8is SUV | SUV | 04.04 to 09.06 |