Final answer:
The symptoms of a bad Mass Airflow (MAF) sensor include decreased engine performance, rough idling, stalling, and decreased fuel efficiency. It is important to have a qualified mechanic diagnose and replace a faulty MAF sensor.
Step-by-step explanation:
The symptoms of a bad Mass Airflow (MAF) sensor can include a decrease in engine performance, rough idling, stalling, and a decrease in fuel efficiency. Other common symptoms can include hesitation or je_rking during acceleration, engine surging or misfiring, and difficulty starting the engine. Additionally, a malfunctioning MAF sensor can trigger the check engine light on the dashboard.
For example, if the MAF sensor is sending false readings to the vehicle's engine control unit (ECU), it may think there is less air entering the engine than there actually is, resulting in a lean air-fuel mixture. This can lead to poor engine performance and decreased fuel efficiency. On the other hand, if the MAF sensor is faulty and overestimating the amount of air entering the engine, it can cause the engine to run rich, potentially leading to rough idling and stalling.
If you suspect a bad MAF sensor, it is important to have it diagnosed and replaced by a qualified mechanic. They can use diagnostic tools to evaluate the sensor's functionality and make the necessary repairs or replacements.