Test Point 3

TEST POINT 3
Oxygen sensor ageing ahead of catalytic converter, cylinders 1 - 3
Oxygen sensor ageing ahead of catalytic converter, cylinders 4 - 6

DTC 15, 16, 21, 22

NOTE:
Check whether additional faults are stored in the memory, and remedy these faults first.

1. Erase fault memory.

2. Heat the oxygen sensors (test drive under load, run engine without load at high rpm).

3. Perform test drive.

4. Read out the fault memory and check whether the fault was stored again. If the fault re-appears, the corresponding oxygen sensor must be replaced.