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.
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A Cheap Part That Causes Expensive-Feeling Problems
A worn set of spark plugs in the Audi A5 Coupe doesn't make itself obvious: idle roughens slightly, acceleration loses a bit of urgency, and both symptoms are easy to blame on something else entirely. Given how inexpensive the part is, it often gets neglected for far longer than it should.
Audi A5 Coupe Spark Plugs: OEM Part Number
| 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.
Audi A5 Coupe Spark Plugs: What They Do
Every combustion cycle in the Audi A5 Coupe's petrol engine starts with a spark plug igniting the compressed fuel-air mixture, and their condition shapes efficiency, economy and smoothness directly. Diesel versions don't need them at all, relying purely on compression to ignite fuel.
Audi A5 Coupe Spark Plugs: 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 |
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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.
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.
Audi A5 Coupe Spark Plugs: 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.