Removing and installing fuel pre-heating heater element Z66 — AUDI

🧭 Before you start

Fits: Audi A5 (8T, 2007–2016), Audi Q5 (8R, 2008–2017), Audi A4 B8 (8K, 2007–2015); platform code 83

• Renewed: seals/gaskets

📋 Procedure

1. Switch off ignition (and auxiliary heater).
2. Remove auxiliary heater .
3. Detach add-on components of auxiliary heater .
4. Dismantle auxiliary heater .
5. Eject the wires of the fuel pre-heating heater element Z66 from the 14-pin connector (black), contacts 9 and 12.

6. Pull the wires of the fuel pre-heating heater element Z66 sideways out of the seal (1).
7. Remove the circlip (arrow) and detach the fuel pre-heating heater element Z66 with fuel evaporator, seal and plate. [Note: Check burner element and clean or renew it if fuel pre-heating heater element Z66 is defective or if deposits have formed in the burner element which affect the heating operation and cannot be removed with workshop equipment.Before fitting, check the leads to the fuel pre-heating heater element Z66. They must not be damaged or show signs of overheating (risk of short circuit).When installing, ensure that the leads to the fuel pre-heating heater element Z66 are correctly routed and attached.]
8. Renew seals/gaskets.
9. Pay attention to correct assembly of the fuel pre-heating heater element Z66, evaporator, seal and plate unit Exploded view - components inside auxiliary/supplementary heater.
10. Pay attention to the position of the seal (1) at the wires to the glow plug for heater Q9.

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