The coil Packs on the B7 Audi A4 vehicles have a tendency to fail and cause a misfire or a cylinder to misfire all together. Check with the Audi Dealer before purchasing new coils as they may be covered under a Audi/VW recall.  We price checked the coil packs from a number of websites and found the best deals on the 058 905 105 part number OEM Bremi or KarlynUnits at www.euro partscatalog.com

Tools Needed
Torx screwdriver #20
Flat head screwdriver

1. Remove the 2 screws holding the coil pack wiring harness to the engine (Torx 20)

2. Using a flat screwdriver CAREFULLY/GENTLY unclip each of the harness connections to the coil packs. This is where I screwed up and used too much force which broke the piece needed to unlock the CP. If you place the screwdriver in the opening horizontally and then turn 90 degrees you should hear a faint click sound. This means that the Coil Pack is now unlocked from the harness. Be sure to unclip ALL Coil Pack’s regardless of the number being replaced.

3. Now working front to back start to pull on the harness to separate it from the Coil Pack’s. If one or more of the Coil Pack connections is not budging check the clips again to be sure they are unlocked. You should be able to completely separate the harness from the Coil Pack’s.

4. Remove the Coil Pack  you are replacing by pulling upwards with constant pressure. I used the flat head screwdriver for some additional force. If you are going to do this be careful and be aware of what you are using for leverage.

5. Install your new Coil Pack  by inserting the same direction as the old and making sure the mark on either side is lined up with the opening in the engine. Press it all the way down until it will go no farther.

6. Plug the wiring harness back into each Coil Pack moving back to front. Once connected replace the torx screws and tighten until snug (don’t over tighten).