In newer Volvo engines (such as the 2.0L VEA diesel), the Engine Control Unit (ECU) monitors slight increases in Manifold Absolute Pressure (MAP) to detect compression leaking back through the intake valves. Diagnostic Report: Volvo DTC P2DF000 Primary Issue: Global cylinder compression leakage. Likely Cause: Inlet valves not seating or closing properly. Related Codes: Often accompanied by cylinder-specific leakage codes: : Cylinder 1 : Cylinder 2 : Cylinder 3 : Cylinder 4 Check engine light (solid). Engine misfires or rough idling. Reduced engine performance ("Limp mode").
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