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  1. Start by disconnecting the negative terminal of your battery
    • Start by disconnecting the negative terminal of your battery

    • Unscrew the 6 screws then remove the filter.

  2. Unscrew the 4 screws on the engine cover then remove it.
    • Unscrew the 4 screws on the engine cover then remove it.

  3. The AUC sensor must be extracted by rotating it 1/4 turn (green square).
    • The AUC sensor must be extracted by rotating it 1/4 turn (green square).

    • Then remove the cable (yellow line) by pulling on it, it is fixed by 3 staples (blue square).

    • We now unscrew the 2 screws (circled in red) which hold the apron.

    • Remove the apron by pulling on it.

  4. The seal is removed.
    • The seal is removed.

    • Remove the cover of the upper screw. You need an E18 torx socket for the screw.

    • Remove the other 2 torx screws. You need an E16 torx socket.

    • The 2 anti-rapprochement bars can be removed by pulling on them.

  5. We start by removing the screed by unscrewing the 3 screws then we remove it.
    • We start by removing the screed by unscrewing the 3 screws then we remove it.

    • The acoustic cover is removed by unscrewing the 2 screws and then removing it.

  6. Disconnect the pressure sensor.
    • Disconnect the pressure sensor.

    • Now you need to remove the pressure converter from the intake manifold. The pressure converter (circled in purple) is attached to the manifold clip (in red). Simply push the small mounting tab (in blue).

    • A small vacuum hose is connected to the pressure converter AND the manifold, so it must be extracted at the converter (in yellow).

  7. The vacuum hose is removed.
    • The vacuum hose is removed.

    • We disconnect the connection box.

    • The staple is removed from the electrical sheath.

    • Remove the clip holding the hose and then remove the hose. In the photo, the hose is already unclipped.

  8. Unscrew the 12 screws with a 10 socket.
    • Unscrew the 12 screws with a 10 socket.

    • Unscrew the 7 nuts with an 11 socket.

    • The collector is removed.

  9. There is one per candle, you have to press on each side of the head of the beam then pull upwards to remove it from the candle. Then unscrew each spark plug with a long 10mm socket. Then unscrew each spark plug with a long 10mm socket.
    • There is one per candle, you have to press on each side of the head of the beam then pull upwards to remove it from the candle.

    • Then unscrew each spark plug with a long 10mm socket.

    • To reassemble the spark plugs, you can apply a little copper grease to the threads.

    • Everything else is done in reverse order of disassembly.

Finish Line

11 other people completed this guide.

laurent.immo13003

Member since: 03/03/2016

12,942 Reputation

155 Guides authored

21 Comments

Good morning,

Very well done tutorial that allowed a novice like me to change his glow plugs! Great, thank you.

Rock

bsc16517 - Reply

Hello, I am stuck at step 5 I can't remove the yoke I unscrewed but then I have to pull hard? Do you have a technique it doesn't come out for me :-(

THANKS

valery kalombo - Reply

In fact, to remove the knob you have to put it in front drive, to put it back, it doesn't matter.

Henri BOULET - Reply

Hello Laurent,

Actually it's just glued on. Just pull it up like you would a big carrot!

With the knob, a 15 cm plastic rod comes with it. It didn't look solid but the installation was no problem.

@+

FYI, I'm going to upgrade from the 525d to the 525xi :)

Christopher

christophe delouis - Reply

Hello Christophe,

I never took the knob apart, sorry.

Sincerely

Laurent

laurent.immo13003 - Reply

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