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How to change a serpentine belt on a Porsche 911 (2009-2012)

Maintenance Interval: Every 6 years or 60k miles (90k kilometers)

Dealer Cost: ~$600

DIY Cost: ~$60 (including tools)

Difficulty: Medium 

Repair Time: 2 hours

Overview:

Your engine uses a serpentine belt to power the accessories like the power steering and water pumps. Over time, the belt gets worn out and can slip or even break. Porsche recommends replacing the serpentine belt every 6 years or 60k miles (90k kilometers). While this is a fairly straight forward DIY, you will need to have some experience working on cars or mechanical aptitude and patience to replace the serpentine belt yourself. If you are unsure, please visit a certified Porsche dealership or independent mechanic.

These service instructions apply to:

  • 2009-2012 Porsche 911 Carrera, S, 4, 4S

  • 2011-2012 Porsche 911 Carrera GTS, 4 GTS

Parts you'll need for the job:

Instructions:

Here are detailed step-by-step instructions. If you need visuals, you can also check out this write-up here and the video above from YouTuber, irena25661.
 

  1. Gather parts and tools.
     

  2. Open engine cover.
     

  3. Remove engine air box:

    1. Undo MAF sensor plug​ on top of the air box.

    2. Undo another sensor on the passenger side of the air box; unclip it to remove.

    3. On the passenger side and lower portion of the air box, unplug a vacuum line by simply pulling it out.

    4. Loosen hose clamp holding air intake hose to engine air box.

    5. Disconnect the air intake hose from the air box and get it out of the way.

    6. Pull the engine air box out.

    7. Cover the air intake hose with a plastic bag to prevent dirt from getting inside.
       

  4. Now, the serpentine belt should be revealed. IMPORTANT: Take a picture of the arrangement, so you know how the new serpentine belt should go.​
     

  5. Remove your rear license plate, which will reveal a hole. This hole will allow you easy access to a 16mm bolt and spacer that must be removed.
     

  6. Using a 8" extension, a ratchet, and a 16mm socket, remove the engine spacer bolt and spacer. If you have a hard time pulling the bolt out, use a magnetic pick up tool to pull it out.
     

  7. Now using a 30mm wrench, locate the belt tensioner and rotate it to relieve tension on the serpentine belt; carefully grab the serpentine belt and work it out.
     

  8. Take your new serpentine belt and feed it into the engine bay from below your bumper.
     

  9. Carefully re-route the new serpentine belt based on the original pattern.

    1. To get the belt around all the pulleys, you will again need to relieve the belt tensioner using the 30 mm wrench.

    2. You may have to really pull on the serpentine belt to get it around all the pulleys; it is a snug fit.
       

  10. Put to engine spacer bolt back on, apply some thread locker, and torque it to 27 ft-lbs.
     

  11. Reinstall everything.
     

  12. Clean up your work area and put away your tools.
     

  13. You're all done!