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How to Replace Alternator 07-09 Audi A4

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How to Replace Alternator 07-09 Audi A4

Created on: 2016-04-06

Watch this video to learn how to replace the alternator on your 07-09 Audi A4 with the 2.0L engine.

  1. step 1 :Disconnecting the Battery
    • Remove the battery cover
    • Loosen the negative battery cable with a 10mm wrench
  2. step 2 :Loosening the Serpentine Belt
    • Insert the 18mm wrench into the tensioner
    • Turn the tensioner clockwise to loosen the belt
    • Pull the belt off the alternator
    • Release the tensioner
  3. step 3 :Removing the Alternator
    • Remove the engine cover
    • Pop the alternator's cap off with a flat blade screwdriver
    • Loosen the intake hose with a flat blade screwdriver
    • Remove the intake hose behind the alternator
    • Disconnect the battery wire with a 13mm wrench
    • Remove the two T30 screws holding the intake hose over the engine
    • Remove the four 6mm Allen bolts from the alternator
    • Disconnect the alternator wiring harness
    • List the alternator up and out
  4. step 4 :Installing the Alternator
    • Insert the alternator into place
    • Connect the alternator wiring harness
    • Insert the 4 Allen bolts into the alternator
    • Tighten the Allen bolts to 23 Newton Meters or 16.9-17 ft/lbs.
    • Connect the battery wire with a 13mm wrench
    • Insert the intake hose into place
    • Tighten the intake hose with a flat blade screwdriver
    • Replace the two T30 screws holding the intake hose over the engine
    • Replace the engine cover
  5. step 5 :Reinstalling the Serpentine Belt
    • Pull the belt up onto the alternator
    • Pull clockwise on the tensioner with an 18mm wrench
    • Remove the pin
    • Slowly release the tensioner

Tools needed for replacement

  • Hex Wrenches

    6mm Allen Wrench

  • Ratchets & Related

    Socket Extensions

    Ratchet

  • Screwdrivers & Related

    Flat Blade Screwdriver

  • Sockets - Metric

    13mm Socket

    18mm Socket

    10mm Socket

  • Star Drivers & Sockets

    T30 Driver

  • Wrenches - Metric

    18mm Wrench

    10mm Wrench

    13mm Wrench

Installation Video
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Hi, I'm Mike from 1A Auto. I hope this how-to video helps you out, and next time you need parts for your vehicle, think of 1AAuto.com. Thanks!

In this video, we're going to show you how to replace an alternator. This is a 2007 A4, it has the 2.0-liter turbo model, and this procedure is the same for a lot of the vehicles that have this 2.0-liter motor in it. Items you'll need include 10mm, 13mm, and 18mm wrenches, socket and ratchets with extensions will work as well, flat blade screwdriver, T30 Torx driver, and a 6mm Allen bit.

Disconnect your battery. On this car, there should be a panel on top that you take off a couple of fasteners and lift it up and off. Then a 10mm wrench, loosen and remove the negative battery cable.

The belt tensioner is right here at the front of the engine. Your 18mm wrench, put it right onto that big tab right there, pull on the tensioner, slip the belt off, and release the tensioner slowly.

You can remove the engine cover, just set this aside. Flat blade screwdriver, pop the cap off of the alternator here, and then loosen up this clamp for the intake hose. Just grab hold of the hose, pull back and forth, pull it off and down. Disconnect the battery wire, 13mm wrench, take that off, then pull the battery wire off, then just put the nut back on for safekeeping.

Two T30 screws hold this hose in place. We want to remove those just so we can move this a little bit.

4mm Allen bolts hold the alternator in place, we'll remove those, use an extension to get around this hose while you pull it out of the way. As we pull the last bolt out, the alternator pretty much just wants to fly right out of the car. Pull it up, and you want to disconnect this lead here, should be able to just push on the tab, sometimes it helps if you push the connector in towards the alternator first, push down on that tab and release it, and just roll it right up and out.

Remount the alternator. We are putting our original one back in because it's still in good working order. Just have the connector that you plug in up top, drop it down in, work it into place, reconnect the harness connection, and lift it up in place.

Easiest bolt down in, before you start the other three, just make sure this cable is free, that's got to go in, and then start the other three bolts in. Tighten these four bolts, 23 newton meters which is 16.9 ft/lbs., and I'm just kind of taking a little liberty and rounding up to 17 ft/lbs.

Reconnect the battery lead, tighten, put the cap back on, reinstall your intake hose, and tighten.

Use a flat blade screwdriver or a 7mm socket and ratchet. Reinstall our two T30 torque screws that hold this in place, and reinstall your top engine cover. Lifting up on the belt, pull the tensioner with the wrench, put the belt up on the alternator, and let the tensioner do it's job.

Reconnect your battery, tighten it up with the 10mm wrench, and then reinstall the panel that should be there.

Thanks for tuning in. We hope this video helped you out. Next time you need parts for your car, please visit 1AAuto.com. Also check out our other helpful how-to and diagnosis videos.

Tools needed for replacement:

    Hex Wrenches

  • 6mm Allen Wrench

  • Ratchets & Related

  • Socket Extensions
  • Ratchet

  • Screwdrivers & Related

  • Flat Blade Screwdriver

  • Sockets - Metric

  • 13mm Socket
  • 18mm Socket
  • 10mm Socket

  • Star Drivers & Sockets

  • T30 Driver

  • Wrenches - Metric

  • 18mm Wrench
  • 10mm Wrench
  • 13mm Wrench

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