Porsche 928 Workshop Manual page 79

928 Maintenance, Selfdiagnosis
03
Error code 2126
This error code indicates a fault in the area of
the transmission safeguard switch.
Possible faults
Switch defective
Short-circuit to ground
Trouble-shooting:
See repair manual, checking the transmission
safeguard switch, Page 28 - 70.
Error code 2131 and
error code 2132
These error codes indicate a fault in the area
of the knock sensors.
Error code 2131 Knock sensor 1
Error code 2132 Knock sensor 2
Error testing of the knock sensors is an active
error test, i.e. the error test is carried out while
driving.
If there is a fault, first check the wiring for short-
circuit to ground, short-circuit to positive and
continuity, with reference to the circuit
diagram, before replacing knock sensors.
m
Trouble-shooting, EZK control unit
03 - 33
Printed in Germany - XX, 1988