Audi Workshop Service and Repair Manuals

Special tools,
testers and equipment required

• ◆ V.A.G 1526 A
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598 A
• ◆ V.A.G 1598/11

Test sequence

• ‒ Unplug lambda probe connector for left hand or right hand cylinder bank.
  (Fitting location )

• ‒ → Connect up multimeter as follows to measure resistance.

• ‒ Specified value: ∞ ω

If the specification is not obtained:

• ‒ Fit a new lambda probe.

If the specification is obtained:

• ‒ → Connect up multimeter as follows to measure voltage.

• ‒ Switch the ignition on.
• ‒ Specification: 400 ± 50 mV.

If the specification is not obtained:

• ‒ → With the ignition switched off, use adapter V.A.G 1598/11 to connect test box V.A.G 1598 A to connector A only of engine control unit (control unit remains disconnected) => Page 24-17.

• ‒ → Check for open circuit and short to earth/positive or earth in the following wiring connections:

Lambda probe Bank 1 -G39

Lambda probe, bank 2 -G108

• ‒ Rectify short circuit or open circuit if necessary.

=> "Current Flow Diagrams, Electrical Fault Finding and Fitting Locations" binder

• ‒ If the wiring is OK, fit a new engine control unit => Page 24-20.