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How do I trouble shoot the purge valve?

Vehicle: 2002 Chevy Tahoe

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The P0442 is the code for EVAP small leak.

P0442 CHEVROLET - Evaporative Emission Control System Leak Detected Small Leak

Read more: https://www.autocodes.com/p0442_chevrolet.html

Testing the purge control valve requires especial diagnostic tools that measures the pressure change in the EVAP system.

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