Volkswagen Golf Service & Repair Manual: Engine control unit

Removing and installing lambda probe 1 before catalytic converter -GX10-/lambda probe 1 after catalytic converter -GX7-

Lambda probe 1 before catalytic converter -GX10- consists of Lambda probe -G39- Lambda probe heater -Z19- ...

Removing and installing engine control unit -J623- (with metal locking plate)

Special tools and workshop equipment required     Hot air blower -VAS 1978/14A--1- with nozzle -2- fr ...

Other materials:

Charging battery in maintenance mode with battery charger -VAS 5900-
  Note When a battery is being charged in the maintenance mode and an electrical consumer draws current from the battery, the battery charger -VAS 5900- automatically compensates the charge. The maintenance mode can be ...

Seam seals, middle body
  Note Seam seals made during repair work must be identical in appearance and thickness to the original seam seals. To avoid damage or faulty operation, brush seam seals smooth near attachments which must be attached. ...

Removing and installing brake servo, LHD vehicles
  Note If there are problems with the brake servo, first check the brake servo vacuum system → Chapter. Special tools and workshop equipment required     ...