Porsche 944 - Manual (Page 38)

03
Maintenance, Self-diagnosis 944
Error code 1131
This error code draws attention to an error in
the area of knock sensor 1.
87/911
Error code 1132
This error code draws attention to an error in
the area of knock sensor 2.
87/910
Error testing of the knock sensors is an
active
error test, i.e. error testing is carried out
during
driving.
If an error has occurred, first check the
wiring
for a ground fault, a short to positive and for
continuity with reference to the circuit
diagram
before replacing the knock sensor.
03 - 26 Troubleshooting
Printed in Germany - XVI, 1987