Porsche 928 Workshop Manual page 84

03
Maintenance, Self-diagnosis
928
2. The duration of the test drive (minimum
6 minutes)
3. At the end of the test drive, run the engine
for at least 60 seconds without opening the
throttle valve.
After the test drive, read out the error
memory once again.
03 - 40
Resetting the error memory
Printed in Germany - XX, 1988