Parts for your 2020 Audi Q5-Ignition coils

2020 Audi Q5 ignition coils: what they do and when to replace them

Based on Audi’s own technical literature, ignition coils are fitted to 2020 Audi Q5 models with petrol TFSI engines. The Audi erWin Workshop Manual for the Q5 (FY platform) 2.0L TFSI EA888 Gen 3/3B details coil-on-plug units for each cylinder, and the ETKA parts catalogue lists matching ignition coil part numbers (for example, 06K 905 110 variants) for the 45 TFSI and related petrol trims. The 55 TFSI e plug‑in hybrid also uses the 2.0 TFSI engine with coil-on-plug ignition. By contrast, Q5 TDI diesels don’t use ignition coils—Audi Self‑Study Program material for TDI engines notes compression ignition with glow plugs instead. If the 2020 Q5 is petrol, ignition coils are absolutely relevant.

On a 2020 Audi Q5 petrol, each cylinder gets its own coil-on-plug unit. These little transformers step up battery voltage into the big spark needed to light the air–fuel mix. When they’re healthy, the engine fires up cleanly, idles smoothly, pulls hard and sips fuel as it should. When one starts to fade, expect rough idle, hesitation under load, a flashing MIL/EPC light and misfire codes like P0301–P0304.

There’s no strict service interval for coils on the Q5, they’re replaced as needed. It’s smart to check them whenever spark plugs are changed (commonly around 60,000 km on many EA888 schedules—always follow the service book for your build). If a coil fails, many owners choose to replace the faulty one and keep a spare in the boot, others swap the full set for peace of mind, especially on higher‑kilometre cars or before a big trip.

• Symptoms to watch: hard starts, shaky idle, poor fuel economy, exhaust pops, or the engine light with cylinder‑specific misfire codes.
• Good practice: keep water away from the coil tops when washing under the bonnet, ensure coil boots are seated firmly, and use quality OEM‑equivalent parts (Bosch/Beru/Eldor) for consistent spark.
• During servicing of your 2020 Audi Q5 ignition coils, have a technician inspect for heat cracking, oil contamination in the plug wells, and brittle connectors. A light smear of dielectric grease on the boot helps future removal.

Replacement is straightforward: disconnect the battery if required by workshop procedure, unclip the electrical connector, gently lift the coil, swap in the new unit, and refit. Avoid levering on plastic, a proper coil puller is handy. Clear any stored DTCs and road‑test. If misfires persist, check the spark plug, wiring and engine earths. Done right, fresh coils restore that silky Q5 feel and keep the catalyst safe by stopping raw fuel from reaching the exhaust.

Popular questions about 2020 Audi Q5 ignition coils

How long do the coils usually last?
Many see well over 100,000 km, but heat and vibration can shorten life. They’re not a scheduled item, so plan to test/inspect them at each plug change and replace on evidence of misfire, cracking or weak output.

Should all coils be replaced at once?
Not mandatory. Replacing the single failed coil is fine, but on higher‑kilometre vehicles it’s reasonable to change the full set to avoid repeat visits and keep spark performance even across cylinders.

Can a bad coil damage anything else?
Yes—consistent misfires from a weak coil can overheat and damage the catalytic converter. If the MIL flashes or the engine runs roughly, reduce load and have it checked promptly.