Mitsubishi Code P0442 is an auto-code that indicates an issue with the Evaporative Emission Control System (EVAP) in vehicles made by Mitsubishi. This code is triggered when the EVAP system detects a small leak, the intake air temperature is greater than -10°C (14°F), and the engine coolant temperature is greater than 20°C (68°F). An issue in the fuel tank, purge line, vapor line, evaporative emission canister, or evaporative emission ventilation solenoid can all cause this code to be triggered. A loose fuel cap is also a potential cause of this code. Fortunately, several Service Bulletins available for Mitsubishi Code P0442 can help you diagnose and fix the problem.
Common Causes and Solutions for Mitsubishi Code P0442
| Cause | Solution |
|---|---|
| Loose Fuel Cap | Tighten the fuel cap to ensure a proper seal |
| Fuel cap relief pressure is incorrect | Replace the fuel cap |
| Evaporative Emission Canister seal leaking | Replace the canister seal |
| Fuel tank, purge line, or vapor line seal leaking | Replace the seal |
| Evaporative Emission Ventilation Solenoid not sealing | Replace the solenoid |
When the Mitsubishi Code P0442 is triggered, it indicates an Evaporative Emission Control System (EVAP) issue. The code is activated when the intake air temperature is greater than -10°C (14°F), the engine coolant temperature is greater than 20°C (68°F), and the pressure in the fuel tank is less than 451 Pa (0.065 psi). The cause of the code may be attributed to a loose fuel cap, fuel cap relief pressure being incorrect, the evaporative emission canister seal leaking, the fuel tank, purge line, or vapor line seal leaking, or the evaporative emission ventilation solenoid does not seal. Fortunately, several Service Bulletins available for Mitsubishi Code P0442 can help you diagnose and fix the problem.
Tightening the Fuel Cap
A loose fuel cap is one of the most common causes of Mitsubishi Code P0442. This can be easily fixed by simply tightening the fuel cap until it is secure. This will ensure the fuel cap creates a proper seal and help eliminate potential leaks.
Fuel Cap Relief Pressure
The fuel cap relief pressure may also be incorrect, which can cause the code to be triggered. It would be best to replace the fuel cap with a new one to fix this issue. This will help to ensure that the relief pressure is correct and that the code will not be triggered.
Leaks in Evaporative Emission Canister and Lines
Leaks in the evaporative emission canister seal, fuel tank, purge, or vapor line can also trigger Mitsubishi Code P0442. To fix this, you will need to replace the leaking seals. This will help to ensure that no leaks are present and that the code will not be triggered.
Evaporative Emission Ventilation Solenoid
Finally, the evaporative emission ventilation solenoid may not be sealing correctly. To fix this issue, you will need to replace the solenoid. This will help ensure that the solenoid creates a proper seal and that the code will not be triggered.
Conclusion
Mitsubishi Code P0442 is an auto-code indicating an Evaporative Emission Control System (EVAP) issue. To fix this code, you will need to ensure that the fuel cap is secure, the fuel cap relief pressure is correct, the evaporative emission canister seal, fuel tank, purge line, or vapor line seals are not leaking, and that the evaporative emission ventilation solenoid is sealing correctly. Fortunately, several Service Bulletins available for Mitsubishi Code P0442 can help you diagnose and fix the problem. With the help of these Service Bulletins, you can easily fix Mitsubishi Code P0442 and get your vehicle running smoothly again.
FAQs About Mitsubishi Code P0442
How might one address an EVAP system leak?
One should first attempt to tighten or replace the fuel cap. If this doesn’t resolve the issue, a thorough visual examination of the EVAP system is recommended. The affected component should be returned if tears, holes, or cracks are observed in the tubes or hoses.
What does the P0442 code signify for a Mitsubishi Mirage?
This particular code indicates a minor evap leak within the fuel system.
What triggers the appearance of the P0442 code?
There are multiple codes associated with various failures. Specifically, the P0442 code is linked to minor leakages ranging between 0.2 to 0.4 inches. This code frequently emerges when the gas cap is improperly secured, damaged, or not tightened post-refueling.
Is it safe to operate a vehicle displaying the P0442 code?
While it isn’t as critical as issues like O2 sensor malfunctions, the presence of the P0442 code can impact vehicle emissions. Thus, while driving is still possible, one should be cautious about mandatory emissions tests in regions where they are required.
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