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 between 40 kg/h and 140 kg/h
Load signal between 18% and 80%

Fig 1: DTC P1126 & P1133 Fault Conditions (Below Limit)

Courtesy of PORSCHE OF NORTH AMERICA, INC.

NOTE: If DTC P0445 (EVAP canister purge valve - short to ground) is stored in the memory, correct this fault first. An open EVAP canister purge valve can lead to the lean threshold being reached.

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