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A4 Spark plugs Install Guide
Your A4
Pick your year to see what fits.
This page covers the US A4.
+0–3 whp (est.)
Easy$60–$10030 min
Why do it
Fresh plugs bring back lost power.
Tools you'll need
- Spark plug socket
- Extension
- Torque wrench
Starting out? See our budget tool list.
Parts to buy
- NGK Iridium IX BKR7EIX Lists the A4 B8.Fits 2009–2016
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Before you start
- Work on a cold engine. Do one plug at a time.
Steps
Pull the coils
- Take off the cover and unplug the coils.
Pull the plugs
- Unscrew the old plugs.
Fit the new plugs
- Fit and torque the plugs, then refit the coils.
How to know it worked
- The engine starts and idles smoothly.
- No warning lights.
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Safety first
- Park on flat ground, set the parking brake and chock the wheels.
- Never get under a car held up only by a jack. Use jack stands.
- Let the engine and exhaust cool first.
- Disconnect the battery before unplugging electrical parts.
- Wear safety glasses.
- If something doesn't match your car, stop and ask a shop.
Follow your part's instructions and your service manual's torque specs.
Spark Plug install guides for other cars