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Engine control unit > < Removing and installing Lambda probeG39 with Lambda probe heaterZ19

A4 Mk3

Removing and installing pressure differential senderG505
Removing and installing pressure differential sender -G505-
  Note
The pressure differential sender -G505- detects the amount of deposits in the particulate filter.
Special tools and workshop equipment required
t  → Vehicle diagnostic tester
Removing
–  Pull off engine cover panel → Chapter.
   
–  Unplug electrical connector -3-.
–  Unscrew bolt -2- and detach pressure differential sender -G505-.
–  Before disconnecting, spray hoses coming from exhaust gas pressure sensor 1 -G450- with suitable release agent.
–  Carefully disconnect the hoses from their connections (take care to keep the hoses straight: the connections on pressure sensor can break off easily).
Installing
Installation is carried out in the reverse order; note the following:
l  Tightening torque → Chapter „Lambda probe and exhaust gas temperature senders - exploded view“
  Note
t  Before installing, blow out pressure pipes from pressure differential sender -G505- to particulate filter towards particulate filter with compressed air (pipes can become obstructed or may ice up due to condensation).
t  Make sure that hoses are securely fitted and that there are no leaks.
t  If pressure pipes are detached from particulate filter, tighten pressure pipe connections → Rep. gr.26.
After renewing pressure differential sender -G505- and/or particulate filter, adaption must be performed in order to reset learnt values. The adaption procedure is described in the Guided Fault Finding or Guided Functions.
Use → Vehicle diagnostic tester.
  A23-10555

Engine control unit > < Removing and installing Lambda probeG39 with Lambda probe heaterZ19