⚠️ Audi manufacturer position
Volkswagen Group ELSA requires draining via fuel cart before tank removal where needed. Misfuel damage is excluded from warranty. Follow anti-static and fire precautions in the Petroleum (Consolidation) Regulations 2014 workshop controls.
Vehicle information
| Make | Audi |
|---|---|
| Model | Q5 |
| Market status | Sold new in the UK — current and recent generations |
| Body styles | SUV |
| Generations | 8R (2008–2017), FY (2017–present) |
| Engine options | Petrol: 2.0 TFSI, 3.0 TFSI (variants) Diesel: 2.0 TDI, 3.0 TDI Hybrid: TFSI e PHEV Electric: Q5 e-tron (where offered) |
| Fuel tank capacity | Approx. 70 L |
| Fuel system | MLB Evo; common-rail diesel with SCR/AdBlue on many UK TDIs |
| Access method | Fuel pump/sender module access under rear seat (most hatchbacks/saloons) — consult ELSA for your bodystyle |
| Anti-siphon | Yes — filler-neck anti-siphon or capless (Easy Fuel) on many UK models; neck siphoning is not an ELSA procedure. |
| Service portal | VW Group erWin / ELSApro (authorised workshop subscription) |
Misfuel risk High
UK Q5 TDI models are common; petrol in the diesel tank is the usual misfuel. Do not start the engine — common-rail HPFP lubrication relies on diesel. Even a short run can damage the pump and injectors.
If the engine was not started
Do not start the engine or turn the ignition to RUN. Do not drive. Arrange GBIFDA-certified drainage before contamination reaches the high-pressure pump. Keep receipts for contaminated fuel disposal (Environment Agency / SEPA / NRW / NIEA duty of care).
If the engine was started
If the engine ran on petrol in a TDI, expect inspection of the high-pressure pump, injectors, fuel rail, filters, and low-pressure lines. VW Group warranty excludes misfuel damage; follow ELSA repair scope and consider insurer or Motor Ombudsman routes for disputes.
Access procedure
- Disconnect the 12 V battery negative terminal and ensure the ignition is OFF (avoid fuel pump priming on key-on).
- Relieve fuel system pressure per VW Group ELSA — open filler cap briefly only if the procedure allows.
- Remove rear seat cushion and access panel to reach the in-tank pump/sender module.
- Drain contaminated fuel through the approved module ports using a fuel cart; capture waste under COSHH and duty-of-care rules.
- Replace fuel filter(s) as specified; inspect seals on the pump module.
- Refill with the correct UK-grade fuel (petrol E10 or diesel to BS EN 590); prime the low-pressure circuit per ELSA.
- Reconnect battery, clear fault codes, and road-test after checking for leaks.
Related models
- Q7
- Macan
Frequently asked questions
What should I do if I put petrol in my Audi Q5 diesel?
Do not start the engine. Petrol in diesel destroys HPFP lubrication on common-rail TDIs. Call a GBIFDA-certified technician to extract fuel from the tank via the OEM access method and dispose of waste fuel legally.
Can I drive my Q5 to the garage after misfuelling?
No — even a few hundred metres can draw petrol into the high-pressure system. Recovery without starting is the safest option.
Will Audi honour the warranty after misfuel?
No — fuel contamination is treated as misuse. Repairs are customer or insurance funded; keep drainage invoices for any claim.
What if I put diesel in my petrol Audi Q5?
Do not start the engine. Diesel is heavier and can foul injectors or spark ignition systems once running. Fuel extraction and system flush per ELSA before restart.
Need professional misfuel recovery?
Find a certified operator or read consumer guidance for your next steps.
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