
Audi fuel caps are often held in place by a small rubber cord or strap to prevent loss during filling. This can be prone to breaking, and replacement caps can be purchased from Audi for around £45. Alternatively, you can replace the rubber ring or strap yourself by purchasing a similar one from eBay or another car manufacturer, such as SEAT. This can be a cost-effective solution, but it is important to ensure that the replacement part fits correctly and is installed safely.
| Characteristics | Values |
|---|---|
| Problem | The small rubber cord that tethers the fuel cap in place to prevent loss during filling of the fuel tank is broken |
| Solution | Replace the fuel cap and thong at a cost of £45 |
| Alternative solution | Buy a similar ring/strap from eBay for £9.59 and fit it to your existing cap |
| Time taken | 30 minutes for a fully qualified Audi technician |
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What You'll Learn

Replacing the fuel cap retaining band
Once you have the new tether, the process of replacing it is relatively straightforward. First, remove the old tether by unclipping it from the side of the filler compartment. Then, clip the new tether into place, ensuring that it is securely attached. Finally, test the new tether by filling up your fuel tank to ensure that it is functioning properly.
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Replacing the fuel cap strap
The fuel cap retaining band is a common problem with all Audi models. The small rubber cord that tethers the fuel cap in place can break. Before ordering a new tether, check the fitting and the internal seal for cracks.
You can buy a replacement strap from eBay. One user on an Audi forum bought a SEAT one from eBay for £9.59 and fitted it to their existing cap.
Alternatively, Audi will replace the cap and thong for about £45. This will take a qualified Audi technician about half an hour.
To replace the strap yourself, you will need to remove the ring from the new cap and fit it to your existing cap.
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Fixing the fuel cap lid lock actuator
To fix the fuel cap lid lock actuator, you'll need to follow these steps:
- Drill the necessary holes and clean up any debris.
- Remove the gas cap and take out the black "Hinge Assembly" by wiggling it from side to side. Push one end in while pulling the other end out, and repeat until the whole assembly pops out.
- Put the gas cap back on to prevent fuel vapours from causing an unsafe work environment.
- Take out the foam piece and set it aside.
- Unscrew the actuator by removing the two Philips head screws holding it to the hinge assembly.
- Unplug the connector from the actuator.
- Open the shelf panel on the passenger side of the trunk, following the directions in your manual.
- You should now see a red cable. If it's latched to something, unlatch it so you can remove the actuator.
- Replace the old actuator with a new one.
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Removing the black hinge assembly
To remove the black hinge assembly, you'll need to start by wiggling it from side to side. Push one end in while pulling the other end out, then switch, until the whole assembly including the painted lid pops out. Once it pops out, put the gas cap back on to avoid fuel vapours from causing an unsafe work environment.
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Replacing the rubber cord
To replace the rubber cord on an Audi fuel cap, you will need to purchase a replacement part. This can be done by ordering a new tether from Audi, or by purchasing a similar ring/strap from another car manufacturer, such as SEAT. Once you have the new part, the process of replacing the rubber cord is relatively straightforward.
First, you will need to remove the old rubber cord from the fuel cap. This can be done by pinching the plastic ring around the cap and pulling it off. The cord may also be clipped to the side of the filler compartment, so you will need to unclip it from there as well.
Next, take the new rubber cord and fit it to the fuel cap. This can be done by stretching the cord around the cap and securing it with the plastic ring. Make sure that the cord is taut and securely attached to the cap to prevent it from coming loose during filling.
Finally, clip the other end of the cord to the side of the filler compartment. Test the new setup by filling up your fuel tank and ensuring that the cord tethers the fuel cap in place as intended.
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Frequently asked questions
Audi will replace the cap and thong for around £45. Before ordering a new tether, check the internal seal for cracks.
The fuel cap retaining band is the small rubber cord that tethers the fuel cap in place to prevent loss during filling of the fuel tank. This is a common problem with all Audi models.
The retaining band is held on by a plastic ring around the cap that comes off easily. It also unclips at the other end from the side of the filler compartment.
To fix the fuel cap lid lock actuator, you need to unplug the connector from the actuator. Then, open the shelf panel in the passenger side of the trunk using the directions in your manual. Once you have removed it, you should see a red cable hanging freely or latched to something. If it's latched, you will need to unlatch it so you can remove the actuator and replace it with the new one.











































