What are the symptoms of a faulty BMW mass air flow sensor?
1 Answers
Symptoms may include increased engine fuel consumption, difficulty starting, and lack of engine acceleration power. The following are manifestations of faults in other parts of the vehicle: 1. Oxygen sensor: When the oxygen sensor fails, the ECU cannot obtain this information and thus cannot determine whether the injected fuel quantity is correct. An inappropriate air-fuel ratio will lead to reduced engine power and increased emission pollution. 2. Wheel speed sensor: Its main function is to collect the vehicle's speed to determine if there are signs of skidding. Therefore, a dedicated sensor is used to collect the wheel speed, typically installed on the hub of each wheel. Once the sensor is damaged, the ABS will fail. 3. Coolant temperature sensor: When the coolant temperature sensor fails, it often still displays the temperature signal from when the engine was hot during a cold start. The ECU cannot obtain the correct signal and can only supply the engine with a leaner mixture, making it difficult to start the engine when cold, accompanied by unstable idle operation and insufficient acceleration power. 4. Electronic throttle pedal position sensor: When the sensor fails, the ECU cannot detect the throttle position signal or obtain the correct position of the throttle pedal, resulting in poor engine acceleration or even the inability to accelerate. 5. Intake pressure sensor: As the name suggests, the intake pressure sensor detects a series of resistance and pressure changes according to different engine speed loads, converting them into voltage signals for the ECU to adjust fuel injection quantity and ignition timing. It is generally installed near the throttle body. If it fails, it can cause ignition difficulties, unstable idle, and lack of acceleration power.
