Typically, there are four spark plugs in the 2014 Audi A4's gasoline engines (one per cylinder on a 4-cylinder). Diesel versions use glow plugs instead of spark plugs, so they do not have spark plugs.
Engine options in the 2014 A4
The 2014 A4 lineup includes both gasoline and diesel powertrains. For gasoline engines, the number of spark plugs matches the cylinder count. Diesel variants use glow plugs, which are not spark plugs, and their count corresponds to the number of cylinders but serves a different purpose in ignition.
- 2.0L turbocharged inline-4 gasoline (4-cylinder): 4 spark plugs
- 3.0L TDI diesel V6: 6 glow plugs (not spark plugs)
Bottom line: most gasoline A4s from 2014 have four spark plugs, while diesel models use glow plugs and thus have no spark plugs.
How to identify the exact spark plug setup for your car
To confirm the precise plug arrangement for your specific vehicle, use these steps. They help ensure you order the correct replacement parts and follow the right maintenance schedule.
- Check the engine code and model designation in the owner's manual or on the vehicle’s information sticker to confirm whether you have a gasoline 4‑cylinder or a diesel V6.
- Inspect the engine bay or service records to verify the engine type (e.g., 2.0L TFSI vs. 3.0L TDI).
- Note that diesel engines use glow plugs, not spark plugs; count or confirm the plug type accordingly when planning maintenance or replacements.
Knowing the exact engine helps determine both the number and type of plugs you need, as well as the appropriate replacement intervals.
Summary
The number of spark plugs on a 2014 Audi A4 largely depends on the engine. Gasoline 2.0L four-cylinder A4s typically have four spark plugs, while diesel 3.0L engines use glow plugs (six in a V6 layout) and do not use spark plugs. Always verify your engine type via the VIN, owner’s manual, or service records to be sure.