P2279 and P1504 Faults on SEAT CORDOBA 6L2 1.4 BXW MGB - ECU Enters Emergency Mode at High Speed

The SEAT CORDOBA 6L2 1.4 BXW MGB (model year 2007) is experiencing a critical issue where the Engine Control Unit (ECU) enters emergency mode and fails to respond properly to accelerator input, particularly at higher speeds. Diagnostic logs show two recurring fault codes: - P2279: Intermittent leak detected in the air intake system - P1504: Intermittent leak detected in the intake air system Both faults are recorded with a high priority (Priority 1) and appear under identical freeze frame conditions, including engine load, speed, temperature, and absolute pressure. The fault data is consistent across multiple log entries (LOG1 and LOG2), indicating recurring instability. In operational testing: - At speeds above 109 km/h, the vehicle exhibits unstable behavior during acceleration. - When coasting at lower speeds (~35 km/h), a noticeable change in exhaust sound occurs, suggesting an air intake system malfunction. - The issue does not occur when the N80 intake valve is disabled, implying that the fault is directly related to airflow dynamics and sensor readings. The ECU's emergency mode activation suggests that it has detected abnormal air intake pressure or flow, leading to a loss of throttle response. This could be due to an intermittent leak in the intake system, possibly caused by a failing hose, loose connection, or faulty vacuum component. Note: The fault codes are not present when the N80 valve is removed, indicating that the ECU's air intake monitoring is sensitive to the presence of this component. This points toward a potential sensor misreading or pressure fluctuation due to airflow disruption in the intake path.