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

How often they actually need changing, and the symptoms that mean it's overdue.

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 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Accuracy note: confirmed for the 2.0 TFSI turbo petrol on early-to-mid F5 cars (2013–2016 build) — later cars may use a superseded reference.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, 2013–2016	Audi OEM: 06H-905-601-A (Bosch or NGK, both genuine factory-fit options)
Recommended plug gap	0.028in 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.

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.

Fitment & Compatibility

Plug type, gap and thread specification differ between engine sizes and generations of the A5 Coupe — copper, platinum and iridium plugs are not simply interchangeable upgrades, since the correct type depends on your specific engine's design. Always confirm the exact specification for your engine before ordering.

Warning Signs & Replacement Interval

Symptoms Worth Acting On

Rough idle or engine misfire — often the first noticeable sign, especially at idle or under light load.
Reduced fuel economy — worn plugs cause less efficient combustion, quietly increasing fuel consumption over time.
Difficulty starting — particularly noticeable in cold or damp weather once plugs are significantly worn.
Check engine light with a misfire code — a definitive sign worth acting on rather than ignoring.

Standard copper plugs typically need replacing every 20,000-30,000 miles, while iridium or platinum plugs can often go 60,000-100,000 miles — always check your specific engine's schedule rather than assuming a generic interval.

DIY Replacement Difficulty

This is generally an easy-to-moderate DIY job on most engines, requiring a spark plug socket and a torque wrench to avoid over-tightening, which can damage the cylinder head. Some engine layouts have easier access than others — V6 or V8 engines with rear-bank plugs can be considerably more involved than a straightforward inline four. Expect 30 minutes to an hour for most four-cylinder engines.

OEM vs. Aftermarket

Reputable aftermarket spark plugs from established brands are widely regarded as equivalent to OEM parts, provided the type and specification match exactly. This is one part where sticking to the manufacturer's specified plug type matters more than the brand name on the box.