BMW E46 318i 1.9L M43 Coolant Expansion Tank 07/1998–08/2001 – Cap & Sensor

BMW E46 318i M43 coolant expansion tank and cap in the original Parts Factory Australia frame
BMW E46 318i M43 coolant expansion tank, side view with cap and mounting pieces
BMW E46 318i M43 coolant expansion tank showing hose ports and retaining clip
BMW E46 318i M43 coolant expansion tank, reverse view showing hose openings and mounting pieces

BMW E46 318i 1.9L M43 Coolant Expansion Tank 07/1998–08/2001 – Cap & Sensor

Product Rating:

Original price was: $119.00.Current price is: $80.30. (Inc. GST)

Out of stock

Categories ,
3-year warrantyReplacement cover · view terms Australian supportContact our local team
Secure checkoutTrusted payment options
Fitment helpSend your VIN or part number

New aftermarket coolant expansion tank with cap and level sensor for Australian BMW 3 Series E46 318i sedan 1.9L M43 petrol applications built 07/1998–08/2001. References 17117573780 / 17137787040. Match the reservoir shape, filler neck, hose connections, mounting arrangement and original sensor connection before ordering. Supplied as one tank with cap and level sensor; hoses, coolant and vehicle mounting hardware are not included. This listing does not cover the later 2.0L N42/N46 318i tank. Send your VIN, build date and photographs of the original tank and connections for a fitment check.

Australian orders under 500g receive free express postage. Orders weighing 500g or more receive free regular postage. Dispatch is from Queensland; availability and delivery estimates are shown at checkout.

Tested in Australia before dispatch. Three-year replacement warranty; professional installation and receipts required. See the warranty terms below.

At Parts Factory Australia, we stand behind every product we sell. That’s why every part comes with our 3-Year No Bullsh*t Warranty. If the part fails within 3 years due to a manufacturing defect, we’ll replace it or refund it — no fine print, no runarounds, no waiting weeks for answers.

It covers all parts we sell and all genuine faults — not damage from dodgy installs, crash damage, or backyard modifications. Just send us your proof of purchase and show us what went wrong — we’ll sort it fast.

We move through stock quickly, so you’re not getting old junk from the back of a warehouse. Our parts are fresh, current, and built to last — and if they don’t, we’ll make it right. That’s the Parts Factory promise. Simple. Honest. Aussie.

We prioritise fast and reliable shipping so you can get back on the road without the wait. Orders placed during business hours are dispatched immediately for fast turnaround.

✔️ Free Express Post on orders under 1kg – arrives in 2 days (3 days for WA)
✔️ Standard Delivery for any part – 2 to 4 days Australia-wide
✔️ Need it sooner? Upgrade to Express for just $15 flat-rate anywhere in the country

No delays, no excuses — just quick delivery and quality parts at your door. 

  • Trusted Aussie Supplier – Born and based in Australia, we understand the urgency of keeping your vehicle on the road. No offshore call centres, no slow imports — just fast, local service.

  • Fast & Free Shipping – Most parts are dispatched same-day with free express shipping on smaller orders. Need it quicker? Flat-rate express available. We don’t keep you waiting.

  • 3-Year No Bullsh*t Warranty – We stand by what we sell. If it fails from a genuine fault, we replace it or refund it. No excuses, no long waits — just honest backup.

  • Fresh, Up-to-Date Stock – We turn stock over quickly, so you always get the latest, most up-to-date versions — not old, dusty parts that have been sitting on shelves for years.

  • OEM Fitment, Affordable Price – We partner with medium-to-high-tier manufacturers to deliver OEM-matching quality without the dealership price tag.

  • Real People, Real Knowledge – Our team comes from hands-on, wrecking-yard backgrounds — we know cars, not just part numbers. Call us, message us, or visit — we’re here to help.

Google reviews

Trusted by Parts Factory customers

4.6 / 5500 Google reviews

Read all reviews ↗
Dylan MatsenGoogle review · Commodore parts
★★★★★
“Everything arrived well-packaged and in perfect condition, exactly as described.”
Read Dylan’s review on Google ↗
Lyndel McAuliffeGoogle review · Window regulator
★★★★★
“After watching their tutorial I figured I could do this myself. … Now I have a window that works perfectly.”
Read Lyndel’s review on Google ↗
Reddawn DawnGoogle review · Alternator
★★★★★
“I ordered an alternator and it arrived within days, well packed and in good order. Communication was great.”
Read Reddawn’s review on Google ↗
Sanjit RijalGoogle review · Customer service
★★★★★
“It's not always easy dealing with returns, but they handled it professionally and quickly. I really appreciate the support they provided.”
Read Sanjit’s review on Google ↗
Chris PeacockGoogle review · Parts Factory Australia
★★★★★
“Questions answered quickly and order processed and delivered as per order.”
Read Chris’s review on Google ↗

Selected excerpts about Parts Factory Australia. Rating checked 25 September 2026.

Description

YOUR PART. EVERY DETAIL.

Early E46 318i M43 expansion tank

The right part.
Down to the detail.

New aftermarket coolant expansion tank with cap and level sensor for Australian BMW 3 Series E46 318i sedan 1.9L M43 petrol applications built 07/1998–08/2001. References 17117573780 / 17137787040. Match the reservoir shape, filler neck, hose connections, mounting arrangement and original sensor connection before ordering. Supplied as one tank with cap and level sensor; hoses, coolant and vehicle mounting hardware are not included. This listing does not cover the later 2.0L N42/N46 318i tank. Send your VIN, build date and photographs of the original tank and connections for a fitment check.

Ask our team about fitment ↗

Listed application318i sedan · 07/1998–08/2001
Specification1.9L M43 petrol · cap and level sensor
Reference17117573780 / 17137787040

Reference 17117573780 / 17137787040. Send our team your exact model, build date and a photo of the original part if you need a fitment check.

Early E46 318i M43 expansion tank — product detail
Australian testedBefore dispatch
Early E46 318i M43 expansion tank — additional product view
Actual supplier photographs show the black reservoir, pressure cap, hose ports, retaining clip and mounting pieces. Match the tank and original connections before ordering.
Carefully selected. Locally tested.

Confidence starts
before dispatch.

We select our manufacturers for quality, and every part is tested in Australia before it leaves us. It’s a standard we stand behind with local support.

Every partTested in Australia
3 yearsReplacement warranty

Meet our selected manufacturers ↗

Sent from Queensland

Less waiting.
More driving.

Australian orders under 500g receive free express postage. Orders weighing 500g or more receive free regular postage. Dispatch is from Queensland; availability and delivery estimates are shown at checkout.

Delivery information ↗

Orders under 500g

Free express postage.

Express delivery is included for Australian orders under 500g.

Orders 500g and over

Free regular postage.

Heavier orders travel by regular post at no delivery charge. See the shipping policy for available options.

Clear delivery information

Know what to expect.

Check the shipping policy for delivery information, or contact our team before ordering.

Parts Factory Australia team member packing a parts order at the warehouseShelves of boxed automotive parts in the Parts Factory Australia warehouse
Behind the scenes
at Parts Factory
Family owned. Australian operated.

Real people.
Behind every part.

For nine years, our family-owned business has helped Australians find the parts they need. From checking an application to after-sales support, you can speak with our local team.

Get to know Parts Factory ↗

9 yearsIn business
QueenslandOur Australian base
56 Export Drive, Molendinar QLD 4214Talk to our Gold Coast team · 0423 113 802
Parts Factory Australia warehouse — play our company introductionMeet Parts Factory Australia▶ Short intro
Our business introductionWatch on YouTube ↗
🎬 From our YouTube channel

Real people.
Practical know-how.

Get to know Parts Factory Australia, then explore our installation tutorials, parts guides and practical tips on YouTube.

Explore our YouTube tutorials ↗

Tutorial availability varies by part and vehicle. Check the exact application and follow the product’s professional installation requirements.

3

Years of replacement cover.

Professional installation and receipts are required.
Read the full warranty terms ↗

Help when you need it.

Contact our team for fitment, delivery or after-sales support. View our 7-day returns policy and conditions ↗

Before you order

Good questions.
Clear answers.

A few details now can help you choose the right part first time.

Ask us a question ↗

How do I check this coolant expansion tank fits?

New aftermarket coolant expansion tank with cap and level sensor for Australian BMW 3 Series E46 318i sedan 1.9L M43 petrol applications built 07/1998–08/2001. References 17117573780 / 17137787040. Match the reservoir shape, filler neck, hose connections, mounting arrangement and original sensor connection before ordering. Supplied as one tank with cap and level sensor; hoses, coolant and vehicle mounting hardware are not included. This listing does not cover the later 2.0L N42/N46 318i tank. Send your VIN, build date and photographs of the original tank and connections for a fitment check. Compare the original part and vehicle details; contact us before ordering if anything differs.

What is the reference and key specification?

Reference: 17117573780 / 17137787040. Listed specification: 1.9L M43 petrol · cap and level sensor. Listed product: BMW E46 318i 1.9L M43 Coolant Expansion Tank 07/1998–08/2001 – Cap & Sensor. New aftermarket coolant expansion tank with cap and level sensor for Australian BMW 3 Series E46 318i sedan 1.9L M43 petrol applications built 07/1998–08/2001. References 17117573780 / 17137787040. Match the reservoir shape, filler neck, hose connections, mounting arrangement and original sensor connection before ordering. Supplied as one tank with cap and level sensor; hoses, coolant and vehicle mounting hardware are not included. This listing does not cover the later 2.0L N42/N46 318i tank. Send your VIN, build date and photographs of the original tank and connections for a fitment check.

Is it shipped from Australia?

Australian orders under 500g receive free express postage. Orders weighing 500g or more receive free regular postage. Dispatch is from Queensland; availability and delivery estimates are shown at checkout.

Is there a guide for my installation?

Our YouTube channel includes installation tutorials and parts guides. Check for your exact part and vehicle; not every application has a guide. The video on this page introduces our business.

What does the replacement warranty require?

Professional installation and retained receipts are required. Read the warranty terms for the cover, exclusions and claim process.

Explore the range

More parts. Local support.

Other products from our range. Compatibility varies; check each listing for your model, engine and build date.

BMW 3 Series ABS Sensor Suit E46 Models Between 1998-2005 (34526752683)Explore the rangeBMW 3 Series ABS Sensor Suit E46 Models Between 1998-2005 (34526752683)Check the application, engine and build dates on this listing.View application details ↗BMW E46 Thermostat Housing Suit 3 Series E46 1997-2006 W/Sensor (11531437040)Explore the rangeBMW E46 Thermostat Housing Suit 3 Series E46 1997-2006 W/Sensor (11531437040)Check the application, engine and build dates on this listing.View application details ↗BMW E46 Engine Oil Cooler Assembly Suit 316i 318i Models 1997-2006 Petrol 2.0L (11427508967)Explore the rangeBMW E46 Engine Oil Cooler Assembly Suit 316i 318i Models 1997-2006 Petrol 2.0L (11427508967)Check the application, engine and build dates on this listing.View application details ↗

Reviews

There are no reviews yet

Add a review
You must be logged in to post a review Log In

FAQs

Most Frequent Questions and Answers

Parts Factory Australia shares installation tutorials on our YouTube channel. A video may not be available for your exact part or vehicle. Check the available tutorials or contact our team before starting installation.

Free express postage applies to Australian orders under 500g. Orders weighing 500g or more use free regular postage. Delivery estimates and any paid express upgrade are shown at checkout. See our shipping information for details.

The BMW E46 318i 1.9L M43 Coolant Expansion Tank 07/1998–08/2001 – Cap & Sensor comes with our 3-Year Unlimited Kilometre warranty, covering manufacturing defects and premature failure under normal use. We're Australian owned and operated, so warranty claims are handled locally — just contact our team with your order number and we'll sort it out.

Yes — if the BMW E46 318i 1.9L M43 Coolant Expansion Tank 07/1998–08/2001 – Cap & Sensor doesn't fit your vehicle, you can return it for a refund or exchange within 7 days of receiving it, provided it's unused and in its original packaging. Just contact our team with your order number and we'll sort out the return quickly.

Get a back-in-stock alert Enter your email and we’ll let you know when this part is available again.
0
A NEW WAY TO FIND PARTS

Your next part. One conversation.

Tell our AI what you drive and what you need. It searches our catalogue, asks follow-up questions and helps you narrow down the options.

AI Part Finder

Search the Parts Factory catalogue
Your searchChoose your vehicle

Vehicle details only. Messages are processed by OpenAI.