1. Intake manifold gasket leak: A leak in the intake manifold gasket can cause air to be sucked into the engine, which can cause the engine to run lean and trigger the service engine soon light. Check the intake manifold gasket for any cracks or tears and replace it if necessary.
2. Throttle body gasket leak: A leak in the throttle body gasket can also cause air to be sucked into the engine, causing similar symptoms to an intake manifold gasket leak. Check the throttle body gasket for any cracks or tears and replace it if necessary.
3. Vacuum hose leak: A leak in a vacuum hose can also cause an air leak, which can trigger the service engine soon light. Check all the vacuum hoses for any cracks or tears and replace any damaged hoses.
4. PCV valve: A faulty PCV valve can also cause an air leak. Check the PCV valve for any damage and replace it if necessary.
5. EGR valve: A faulty EGR valve can also cause an air leak. Check the EGR valve for any damage and replace it if necessary.
I suggest taking your vehicle to a qualified mechanic to diagnose the exact cause of the air leak and perform the necessary repairs.
