1.Spark Plugs or Ignition Coils: Worn-out spark plugs or faulty ignition coils can lead to misfires, causing a rough idle and illuminating the check engine light.
2.Faulty Fuel Injectors: Malfunctioning fuel injectors can disrupt proper fuel delivery, resulting in rough idling and engine performance issues.
3.Vacuum Leaks: Leaks in the vacuum system can introduce unmetered air into the engine, causing idling issues and a check engine light.
4.Throttle Body Issues: A dirty or malfunctioning throttle body can affect air-to-fuel flow and lead to rough idling and performance problems.
5.Intake Manifold Runner Issues: In the S500, the intake manifold runners can get stuck open, causing a rough idle and a check engine light.
6.Oxygen Sensors: A faulty oxygen sensor can send incorrect readings about the air-fuel mixture to the engine's computer, which can cause rough idling and a check engine light.
7.EGR (Exhaust Gas Recirculation) System: Problems with the EGR system, such as a stuck valve or vacuum leaks, can cause rough idling and affect overall engine performance.
8.Transmission Problems: If the transmission isn't functioning correctly, it can cause the engine to run rough and trigger the check engine light.
9.Air Mass Sensor: A malfunctioning air mass sensor can provide incorrect readings on the amount of incoming air, leading to a rough idle and a check engine light.
10.Faulty Idle Air Control Valve: The idle air control valve helps maintain a steady idle speed. A faulty valve can cause idling problems and a check engine light.
It's important to have the vehicle professionally diagnosed to identify the exact cause of the rough idling and check engine light. A qualified mechanic will be able to pinpoint the issue and perform necessary repairs or replacements to address the problem.
