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P0442 indicates that the evaporative-emissions monitor detected a small leak. The monitor runs only under certain temperature, fuel-level, and operating conditions, so a code may return after several trips rather than immediately.
Inspect accessible hoses and the filler area, then use a suitable leak test if the fault repeats. Avoid open flames and keep fuel-system testing to the manufacturer's safety procedure.
Quick educational note
For information, not a diagnosis or repair instruction. Vehicle-specific checks are still required. Consult the manufacturer's guidance and a qualified technician.
How to use this information
This article explains general principles and does not establish what is wrong with your vehicle. Read the content limitations.