Diagnosis Conditions

Oxygen sensing system active
Time elapsed after engine start-up:
- 250 to 350 seconds (USA)
- 302 to 402 seconds (RoW)
Engine temperature > 62° C
Intake air temperature < 90° C
Air mass flow < 31 kg/h (986 and 986 S < 28 kg/h)
Engine speed < 960 RPM
No faults in memory

Fig 1: DTC P1128 & P1130 Fault Conditions (Above Limit)

Courtesy of PORSCHE OF NORTH AMERICA, INC.

NOTE: Air leaks ahead of the oxygen sensors can lead to a fault in adaptation. Check exhaust system for leaks. Contrary adaptation values in connection with misfiring point to incorrectly adjusted control times. Check control times and adjust if necessary.

If the fuel tank reserve light is switched on, no fault is entered.