Audi A6 Spark Plugs: Intervals, Fitment & Warning Signs
On the A6, a coil pack replacement on related models genuinely hasn't always fixed a misfire, with worn plugs turning out to be the actual cause.
Illustration for editorial purposes
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OEM Part Number: 06H-905-611 (as quoted in catalogue listings — confirm via engine code) — aftermarket NGK 93322 / Bosch 0 241 245 673
| Petrol engines in this generation | 1.8 TFSI 190 HP; 2.0 TFSI 180, 211, 220, 252 HP (also quattro 211 to 252 HP); 2.8 FSI 204 HP (also quattro 204 and 220 HP); 3.0 TFSI quattro 300, 310, 333, 340 HP; S6/RS6 quattro 420 and 450 HP; 2.0 TFSI Hybrid 245 HP |
|---|---|
| Spark plugs (aftermarket) | NGK 93322 (platinum, 16 mm hex, M14x1.25, 19 mm reach); NGK 5757 (platinum); NGK 94976 (platinum); NGK 94460 (platinum); NGK 94833 (platinum, 26.5 mm reach); Denso IKH24 (iridium, 26.5 mm reach); Denso IK20TT and IK22FTT (iridium centre, platinum earth); Denso PK22PR8 (platinum) |
| Genuine (OE) numbers quoted | Denso IKH24 quotes OE 999 170 232 90; Denso PK22PR8 quotes OE 06H-905-611 (alternative VK22) |
| Fitment notes | Every plug on the list is M14x1.25 with a 16 mm hex, in platinum or iridium; NGK 1496 is the LPG/CNG laser plug. |
Audi A6 Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems
On the Audi A6, there's rarely a clear signal when spark plugs wear out — just a rougher idle, marginally less pep off the line — vague enough to get pinned on other engine issues. Since the part costs so little, it's also one of the easiest things to keep putting off.
Audi A6 Spark Plugs: What They Do
On the Audi A6, combustion efficiency, fuel economy and smooth running all trace back to spark plug condition, since these are what ignite the compressed fuel-air mixture in each cylinder. Petrol engines depend on them entirely — diesels skip spark plugs altogether, igniting fuel through compression instead.
Audi A6 Spark Plugs: Generations, Engines & Spark Plug Count
| Diesel variants | Not applicable — diesel engines use compression ignition and have no spark plugs at all |
|---|---|
| Petrol four-cylinder (standard trims) | 4 spark plugs — one per cylinder |
| S6 (3.0 TFSI V6) | 6 spark plugs — a genuinely different engine family from the standard four-cylinder units |
| RS6/RS7 (4.0 TFSI V8, where applicable) | 8 spark plugs — Audi's twin-turbo V8, shared with several other high-performance models in the wider VW Group range |
Audi A6 Spark Plugs: Watch: Replacing It
C7 3.0T V6 only; 2.0 TFSI owners see https://www.youtube.com/watch?v=JLztkVN1q4Q
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A Genuinely Useful Piece of Context Worth Knowing About Persistent Misfires — Audi A6 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 A6 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.