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DTC P0442: EVAP System Small Leak Detected: Notes

WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Evaporative Emission (EVAP) Diagnostic Station (P/N J41413), or similar, is necessary for accurate diagnostics of EVAP system. This tool will be necessary for vacuum and pressurized leakdown testing of EVAP systems. It is equipped with 2 additional gauges to measure vacuum in inches of mercury (in. Hg), and to measure vapor flow in inches of water (in. H2 0), within an EVAP circuit.