Staff Answer
Jun 25, 2026 - 01:48 PM
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The P219C code indicates the Engine Control Module (ECM) has detected an inconsistent air-fuel mixture specifically in Cylinder 1.
Three Methods for Resolution:
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Method 1: Perform an Ignition "Swap Test": Swap the ignition coil and spark plug from Cylinder 1 with those from a different cylinder. Clear the codes and test drive. If the error code moves to the new cylinder, replace the faulty coil or plug.
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Method 2: Clean or Test the Fuel Injector: Use a high-quality fuel system cleaner for direct-injection engines. If the code persists, the injector in Cylinder 1 may have an internal clog or poor spray pattern and should be flow-tested or replaced.
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Method 3: Inspect for Vacuum Leaks: Use a smoke machine to check the intake manifold gasket and vacuum lines specifically near the Cylinder 1 intake port. A localized leak can lean out the mixture and trigger this code.
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