Car Parts Guide
SPARK PLUGS Audi A5 Coupe (2016–2024, F5) · PARTS GUIDE

Audi A5 Coupe Spark Plugs: Intervals, Fitment & Warning Signs

On the A5, a coil pack replacement on related models genuinely hasn't always fixed a misfire, with worn plugs turning out to be the actual cause.

Generation covered: this guide is for the second-generation A5 Coupe (F5 platform, 2016–2024) — the two-door coupe discontinued when Audi renamed the A4 saloon to A5 in 2024. These are entirely different cars despite sharing a name; if your car is a four-door saloon or estate bought new since 2024, this guide does not apply to it. Check your logbook or VIN if you're unsure which car you have.
Illustration of a spark plug Illustration for editorial purposes

A Cheap Part That Causes Expensive-Feeling Problems

Worn spark plugs rarely announce themselves clearly — a slightly rougher idle, a bit less punch off the line — symptoms easy to blame on almost anything else in the engine bay. The part itself costs very little, which makes it an easy one to overlook for far longer than it should be.

Before you buy: plug type and gap specification vary by engine size and generation. Always confirm against your VIN before ordering.

OEM Part Numbers

Accuracy note: confirmed for the 2.0 TFSI turbo petrol on early-to-mid F5 cars (2013–2016 build) — later cars may use a superseded reference. Diesel variants don't use spark plugs at all.
2.0 TFSI, 2013–2016Audi OEM: 06H-905-601-A (Bosch or NGK, both genuine factory-fit options)
Recommended plug gap0.028in factory spec for turbocharged engines — NGK aftermarket equivalents are sometimes pre-gapped wider at 0.032in, so check before fitting

Audi sourced this plug from both Bosch and NGK during production, and either is considered a genuine factory-correct replacement — pick based on preference rather than worrying about which one your car originally had. If your engine has been remapped or tuned, discuss the correct gap with a specialist rather than assuming the standard factory setting still applies.

Audi A5 Coupe Spark Plugs reference plate

What They Do

Spark plugs ignite the compressed fuel-air mixture inside each cylinder, and their condition directly affects combustion efficiency, fuel economy and smooth running. Petrol engines rely entirely on them; diesel engines don't use spark plugs at all, relying on compression instead.

Generations, Engines & Spark Plug Count

Diesel variants (35 TDI, 40 TDI)Not applicable — diesel engines use compression ignition and have no spark plugs at all
Petrol four-cylinder (35 TFSI, 40 TFSI)4 spark plugs — one per cylinder
S5 (3.0 TFSI V6)6 spark plugs — a genuinely different engine family from the standard four-cylinder units
RS5 (2.9 TFSI V6 biturbo)6 spark plugs — a further, more highly-tuned version of the V6 family, genuinely different in state of tune from the S5's engine despite the shared cylinder count

Shop for This Part on eBay

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A Genuinely Useful Piece of Context Worth Knowing About Persistent Misfires — Audi A5 Coupe Spark Plugs

If a coil pack replacement hasn't resolved a persistent misfire, this is genuinely worth knowing: documented cases on related Audi models describe a coil pack replaced for a specific cylinder's misfire, only for worn or carbon-fouled spark plugs to turn out to be the actual cause instead.

A genuinely useful, money-saving diagnostic technique worth trying first: swapping a suspect coil with the coil from a different cylinder and seeing whether the misfire follows it is considerably cheaper than buying a new replacement coil outright on a hunch.

It's also genuinely worth knowing that failing to fully click the rear coil pack connectors back into place is a frequently documented cause of a misfire appearing immediately after fitting new coils, and that mixing coils from different sources rather than replacing them all together has been documented causing ongoing misfires.

Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Spark Plugs Guide for symptoms of worn plugs, why matching your exact plug specification matters, and trusted brands to buy from.

More Audi Spark Plugs

The same part, covered across other Audi models.