What code is likely set when a poor-quality air filter contaminates the MAF sensor?

The code most likely set when a poor-quality air filter contaminates the MAF sensor is P0101, which relates to MAF sensor performance. This occurs because a clogged or dirty air filter restricts airflow into the engine. When the MAF sensor—responsible for measuring the amount of air entering the engine—receives inaccurate airflow readings due to contamination, the engine control unit (ECU) cannot correctly calculate the air-fuel mixture.

When the MAF sensor's ability to function properly is compromised, it may lead the ECU to misinterpret the amount of air entering the engine. If the readings indicate less airflow than actually present, the ECU might unintentionally introduce more fuel into the combustion chamber, resulting in a rich air-fuel mixture, thus triggering a code related to improper performance or functionality of the MAF sensor itself.

Being aware of how a contaminated MAF sensor affects engine performance is crucial for diagnosing issues related to airflow measurement, which is vital for optimal engine function.