What Causes the Engine Malfunction Light to Flash?

1 Answers
StHazel
07/25/25 12:21am
Here are several reasons why the engine malfunction light may flash: 1. Poor fuel quality: Substandard or poor-quality gasoline can trigger the engine malfunction light and may cause varying degrees of damage to the engine. 2. Oxygen sensor failure: A damaged oxygen sensor or loose/damaged sensor connector can lead to either too lean or too rich fuel mixture, causing the malfunction light to illuminate. For new vehicles with this issue, check if the oxygen sensor connector is loose. 3. Mass airflow sensor failure: While a faulty mass airflow sensor won't necessarily prevent engine startup, it can cause symptoms like unstable idling, poor acceleration, intake backfiring, and black smoke from the exhaust.
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