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Description
Expansion Tank for Audi A1 Sportback, VW Polo & T-Cross - ET34Vehicle Fitment & Part Details This expansion tank for the Audi A1 Sportback cross references OE 2Q0121407, shared across Audi, Seat, and VW. Material is plastic. Confirm compatibility by matching the listed fitment details, any OEM reference numbers supplied, and VIN engine chassis information where variants exist. Key Details SKU ET34 Component Expansion Tank Brand Partquip OEM References Audi Seat VW: 2Q0121407 Audi Seat VW: 2Q0121407A Audi Seat
Vehicle Fitment & Part Details
This expansion tank for the Audi A1 Sportback cross-references OE 2Q0121407, shared across Audi, Seat, and VW. Material is plastic. Confirm compatibility by matching the listed fitment details, any OEM reference numbers supplied, and VIN/engine/chassis information where variants exist.
Key Details
- SKU
- ET34
- Component
- Expansion Tank
- Brand
- Partquip
- OEM References
-
- Audi / Seat / VW: 2Q0121407
- Audi / Seat / VW: 2Q0121407A
- Audi / Seat / VW: 2Q0121407B
- Audi / Seat / VW: 2Q0121407C
- Audi / Seat / VW: 2Q0121407D
- Primary Fitment
- Audi A1 Sportback 30 TFSi DKJA / DKRF (2019-)
- Specs
- Material: Plastic
Key Benefits
- Cross-references 5 OEM numbers shared across Audi, Seat, and VW including 2Q0121407 for verification before ordering.
- Plastic construction matching the original expansion tank material.
OEM Reference Numbers
- Audi / Seat / VW: 2Q0121407
- Audi / Seat / VW: 2Q0121407A
- Audi / Seat / VW: 2Q0121407B
- Audi / Seat / VW: 2Q0121407C
- Audi / Seat / VW: 2Q0121407D
Product Specifications
| Specification | Value |
|---|---|
| Material | Plastic |
Vehicle Fitment
Includes 10 supplied applications.
View Full Vehicle Fitment (10 applications)
| Make | Model | Engine | Years |
|---|---|---|---|
| Audi | A1 Sportback | 30 TFSi DKJA / DKRF | 2019- |
| Audi | A1 Sportback | 35 TFSi DADA / DPCA | 2019- |
| Audi | A1 Sportback | 40 TFSi CZPC / DKZC | 2019- |
| VW | Polo | 1.0 TSi Comfort CHZL | 2018- |
| VW | Polo | 1.0 TSi Comfort CHZJ / DKJA | 2018- |
| VW | Polo | 2.0 GTi CZPC / DKZC | 2018- |
| VW | T-Cross | 1.0 TSi DKJA / DKRF | 2018- |
| VW | T-Cross | 1.0 TSi CHZL / DKLA | 2020- |
| VW | T-Cross | 1.5 TSi DADA / DPCA | 2020- |
| VW | Tiguan | 2.0 | 2019-2021 |
Fitment Notes
- Always match OEM reference number(s) and vehicle details before ordering. Confirm exact fitment using VIN, engine code, or chassis number if multiple variants exist.
Installation / Use / Maintenance Tips
- Compare the new expansion tank to the removed unit before installation to confirm the mounting points, cap type, and hose connections match.
- Flush or clean the cooling system where required before fitting the new part.
- Replace related seals, hoses, or coolant as needed during installation.
- Fill with the correct coolant mixture specified for the application and bleed the cooling system fully.
- After installation, check for leaks and verify the coolant level after the first heat cycle.
Common Questions
Does this expansion tank fit my Audi A1 Sportback?
This part (ET34) is listed for the fitments shown on this page. Confirm by matching the fitment details and verifying VIN/engine/chassis information where variants exist.
What OEM part numbers does this cross-reference?
Listed cross-references: 2Q0121407, 2Q0121407A, 2Q0121407B, 2Q0121407C, 2Q0121407D. Match at least one OEM reference to your original part before ordering.
What brand is this part?
This listing is for a Partquip expansion tank.
How do I confirm fitment if there are multiple variants?
Use VIN, engine code, and chassis/platform details and compare them to the fitment section above. If unsure, request fitment assistance before ordering.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 24 reviews
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Product Reviews
★★★★★ 5
Wish they came with instructions...
They are cheap and work great. They plug right into my Pioneer vsx521 receiver and my Paradigm Atom monitor speakers.
I wish they came with instructions, because it took me about 10 minutes to realize the bottom part unscrews in addition to the top part.
Here are my instructions for installation:
1) Unscrew the bottom part of this connector (the thin metal underneath the red/black ring).
2) Make sure the Banana Plug (which may be loosely screwed into the top part of the connector) is fully tightened down
3) Strip your wire tips to 3/8 of an inch (or just slightly under)
4) Run the first newly stripped wire end through the bottom part you removed in step 1, such that the stripped end of the wire is entering through the flat end and exiting through the smaller threaded end.
5) Leave about 1/8 to 3/16 of an inch of stripped wire hanging past the exit hole.
6) As evenly spaced as possible, bend the over-hanging wire strands over the exit hole (all around it, like a hat). If done properly, the wire should not fall out if you give it a VERY GENTLE tug.
7) Screw the top metal part (with the actual banana plug) back onto the bottom part. It may be difficult if your stripped wire is hanging too low. I've used a pair of pliers to grip the bottom part of the connector while I twist the banana plug side with my hand.
If done correctly, you should be able to put a lot of tension between the wire and connector without removing/damaging it.
UPDATE:
I just recently helped my dad install his 5.1 system without these... it sucked... This item (5 pairs of them in this case) and a good wire stripper can save you alot of pain (both physical and mental). The connectors on the back of his receiver are the kind where bare wire comes in from the side and then the connectors screw down (with a banana plug hole in the center which is where this product would come into play). I felt like a surgeon trying to get a bare wire end into the little slot, and then holding it there while I tighten the connector which is almost impossible since they are so close together...
GET THESE!
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Reviewed in the United States on February 8, 2012
★★★★★ 1
'Monoprice' = Worst stereo banana plugs on T-H-E market.
Size: 5 Pack, Pattern Name: Banana Plugs
The absolute WORST in stereo banana plugs - HANDS DOWN. After installing stereos and components for over 30 years, I'd say I'm experienced. These banana plugs fail at EVERY part of the design. Allow me to explain...
1) Starting with the tips, they are loose off the bat and fit LOOSELY in either the stereo input studs or speaker input studs by their 'girth'. They do not firmly seat in any plug and for this setup, I'm using a nearly $2K setup all together. They 'rock' back and forth (when inserted) and thus create a non-permanent connection, again, seriously making these utter junk. I've seen some items you can get by with over the years, but these aren't even rock bottom. They are unusable!
2) Next, the banana plugs themselves comes as three pieces. No non loosening o-ring seal but a plastic colored want-to-be imitation for positive and negative notation. Why do these stupid things come in three pieces? - I simply can't tell you why. I do know they serve no specific piece to solving the puzzle of installation so why do they come in three pieces...? My speculation is they are cheap china knockoffs.
3) The 'way' in which you normally install the trimmed wiring internally with the 'two-piece' design permits you to firmly CRIMP and hold the unsheathed wiring; but these do not. The overlap/overlay of the exposed wiring can only be about 2/16's of an inch thus not much to create a proper connection with. This single fact eliminates these plugs as even worthwhile component add ons; period. If you can't achieve a good ground/wiring connection, these are a defeated purpose...
4) Because of the design of these, they have no room to crimp and screw on the cable so your forced to nearly break your fingers in an attempt to get the unsheathed wire to overlay the internal threading and twist them on with all your might. This in effect breaks nearly every wire thread internally and then they breaks off inside. Absolute garbage.
These are total pieces of non-quality junk that did nothing but makes me waste 30 minutes on attempting to get them securely on and another 25 to locate my Amazon account, find this product in my order and ALARM anyone else from making the same mistake I made. Now, I find out I can't even get a return on these. Thanks Amazon. Thank you third party retailer. You just made me a very dissatisfied decade long customer.
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Reviewed in the United States on August 17, 2016
★★★★★ 5
Nice quality
Had to return due to our mistake but the mechanic said it was good quality. Ordered the correct size and worked great.
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Reviewed in the United States on March 30, 2025
★★★★★ 5
Perfect fit
Worked great for a 1965 mercury thunderbolt 150hp
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Reviewed in the United States on June 3, 2025
★★★★★ 5
MerCruiser Replacement Parts
OEM quality MerCruiser Alpha 1 Gen1 replacement part. Everything you need and some things you don't because it's a universal kit that works for several models.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 19, 2025