This process is facilitated by the use of a professional-grade scan tool. If you are still plagued by a recurring p0442 diagnostic trouble code, further diagnostics will be required. Step 4: Conduct Further Scan Tool Diagnostics. This can also be aided with the use of a smoke machine, which will make any leaks visually obvious. If the problem persists, a thorough inspection of all EVAP components, including hoses, will be required. In up to 90 percent of cases, steps 1 and 2 will solve the issue at hand. If your vehicle’s check engine light returns, the next course of action is to replace the vehicle’s gas cap, and again clear the diagnostic trouble code. You will then clear this trouble code, and test drive the vehicle in question to see if the check engine light returns. The simplest way to begin when diagnosing a p0442 fault code is to remove, reinstall, and retighten your gas cap. However, a basic diagnostic course of action can speed assist in achieving a quick and accurate diagnosis. Diagnosing an evaporative emissions-related fault such as p0442 can often be a process of trial and error.
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