Q: P0442
We have code P0442 keep coming up we changed the gas cap but the still keeps saying tighten gas cap could we have a small leak in the evap system or should we try to replace the gas cap again?
My car has 120000 miles.
My car has an automatic transmission.
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As you may already know, this may be related to a faulty or leaking gas cap, however this can also be related to several other factors such as the following:
- A non-conforming gas cap (i.e. not factory/original brand)
- A small leak/hole in a fuel vapor hose/tube
- Other small leak in EVAP system
- Faulty vent o-ring seal
- Defective vent valve
- Defective purge valve
- Defective leak detection pump
To avoid any unnecessary repairs, I would suggest having a professional from YourMechanic come to your home to take a closer look at your vehicle’s evaporative emissions system and further diagnose your trouble code.
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