Polo Mk4
| Assembly overview - parts of injection system |
| 1 - | Cap |
| 2 - | Air cleaner housing |
| q | Removing and installing air cleaner housing → Chapter. |
| q | Dismantling and assembling → Chapter. |
| 3 - | Securing clip |
| q | Note version. |
| 4 - | Cable guide |
| q | Clipped onto fuel rail. |
| 5 - | 10 Nm |
| 6 - | Breather valve |
| q | For fuel system. |
| q | Bleeding fuel system → Chapter. |
| 7 - | Fuel rail with injectors |
| q | Dismantling and assembling → Chapter. |
| 8 - | 20 Nm |
| 9 - | From brake servo |
| 10 - | Connector |
| q | Black, 6-pin. |
| q | For throttle valve control module -J338-. |
| 11 - | From active charcoal filter system solenoid valve 1 -N80- |
| 12 - | Intake manifold |
| q | Dismantling and assembling → Chapter. |
| 13 - | Gasket |
| q | Renew. |
| 14 - | From exhaust gas recirculation valve -N18- |
| q | If renewed, adapt engine control unit to exhaust gas recirculation valve → Vehicle diagnosis, testing and information system VAS 5051. |
| 15 - | Lambda probe after catalytic converter -G130-, 50 Nm |
| q | Location: in front exhaust pipe. |
| q | Remove and install with lambda probe open ring spanner set -3337-. |
| q | Grease only the threads with “G 052 112 A”; “G 052 112 A” must not get into the slots on the probe body. |
| q | If seal is leaking, nip open and renew. |
| 16 - | 4-pin connector |
| q | Black |
| q | For lambda probe after catalytic converter -G130- and lambda probe heating 1 after catalytic converter -Z29-. |
| 17 - | Lambda probe -G39-, 50 Nm |
| q | Location: in exhaust manifold. |
| q | Grease only the threads with “G 052 112 A”; “G 052 112 A” must not get into the slots on the probe body. |
| q | Remove and install with lambda probe open ring spanner set -3337-. |
| q | If seal is leaking, nip open and renew. |
| 18 - | 6-pin connector |
| q | Black |
| q | For lambda probe -G39- and lambda probe heating -Z19-. |
| 19 - | 5 Nm |
| 20 - | Engine speed sender -G28- |
| q | Location: cylinder block intake side. |
| 21 - | Seal |
| q | Renew. |
| 22 - | Securing clip |
| q | Check for secure seating. |
| 23 - | Connector |
| q | Black, 2-pin. |
| 24 - | Coolant temperature sender -G62- |
| q | If necessary, release pressure in cooling system before removing. |
| 25 - | Plug |
| q | If necessary, release pressure in cooling system before removing. |
| 26 - | O-ring |
| q | Renew. |
| 27 - | Thermostat housing |
| 28 - | 10 Nm |
| 29 - | Connector |
| q | For engine control unit. |
| q | Only disconnect or connect with ignition switched off. |
| q | Release to disconnect. |
| 30 - | Engine control unit |
| q | On replacement, the control unit must be adapted to the electronic immobilizer → Vehicle diagnosis, testing and information system VAS 5051. |
| 31 - | Retaining frame |
| q | For engine control unit. |
| 32 - | 3 Nm |
| 33 - | Supply line |
| q | Secure with spring-type clips. |
| q | Check for secure seating. |
| q | From fuel filter. |
