Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
The cost to diagnose the P1124 BMW code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.
For a variable valve lift engine, the main function of the throttle body is to control the pressure in the intake manifold. Therefore, the manifold differential pressure plausibility check is testing the plausibility of measured intake manifold pressure in comparison to the measured throttle position. So, no throttle position acquisition error must be present.
The set-point of the differential intake manifold pressure is up to 60-70% of maximum torque request constant 5 kPa beneath ambient pressure. At a higher load, the differential pressure setpoint becomes Zero.
In case the set-point of the differential pressure in the intake manifold is > 3 kPa beneath the ambient pressure, a differential pressure controller is active. The output of the controller is monitored. The output of the manifold pressure controller has to be between adjustable MIN/MAX-thresholds. If the MIN/MAX thresholds are exceeded a time counter is incremented. After this counter reaches the threshold within one diagnosis cycle, a manifold differential pressure sensor malfunction is detected.
The Engine Control Module (ECM) monitors the Differential Pressure Sensor Intake Manifold Adaptation. The Diagnostic Trouble Code (DTC) will be set when the ECM receives an implausible signal from the Differential Pressure Sensor.
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