P1127, P1128

Read the instructions below then start the fault diagnostic procedure.

Symptom: Check Engine on. Poor performance.

P1127, P1128

Fault symptom

•	Check Engine on. Poor performance.

Conditions

The following conditions apply for the DTC in question:

•	P1127: Engine temperature 40-100°C (104-212°F), intake air temperature -5°C to +45°C (23-113°F), air pressure 88-110 kPa. This DTC will be generated if these conditions are fulfilled and the boost pressure is more than 30 kPa below the desired value for more than 6 seconds.

•	P1128: Engine temperature 40-100°C (104-212°F), intake air temperature -5°C to +45°C (23-113°F), air pressure 88-110 kPa. This DTC will be generated if these conditions are fulfilled and the boost pressure is more than 15 kPa above the desired value for more than 6 seconds.

Diagnostic help

P1127: The DTC indicates a mechanical malfunction. The EGR function is turned off.

P1128: The EGR function is turned off. The DTC indicates a mechanical malfunction. If DTC P0120 is present in the EDC control module at the same time as P1128 then P0120 can be neglected.