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.
Recommended Services
| Check Engine Light is on Inspection | $94.99 - $114.99 | Get a Quote |
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.
The statements expressed above are only for informational purposes and should be independently verified. Please see our
terms of service
for more details
Get an instant quote for your car
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
What others are asking
How do I connect a flash drive to the sound system?
Your car is able to play the contents of a flash drive through the sound system. To play a flash drive, follow these quick steps: Open the cover that says USB Aux on the center console. Plug the flash drive...
A/C going out
Hello there, over time it is not uncommon for the AC to stop cooling as well. Common failure points would be the AC fan, low refrigerant level, AC condenser (https://www.yourmechanic.com/services/ac-condenser-replacement), or a blend motor failure. A qualified technician, such as...
Car alarm won't turn off. 2003 Chevy Impala
There are a few things you can try to turn off your alarm (https://www.yourmechanic.com/article/how-to-disable-a-car-alarm). You can put the door key in a door and unlock it and lock it three times in a row. This usually works on the drivers...
Cranks but won't start
Hello, thanks for writing in about your Dodge Ram 1500. I'm curious if your Check Engine light (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection) on. Checking the basics will help here: will it crank but not start? If so, is there spark at the plugs and...
Transmission selector shaft seal leakage. Does it need to be fixed and how expensive is the repair?
If you are referring to the "manual shaft" seal pressed into a bore on the transmission case, which seal is typically around an inch in diameter, it is repairable (replaceable) on the car if there is physical access to the...
Cold Starting Problems
As a general rule, car engines do not like cold weather and do not do operate as well in cold weather. When you start your car in the morning and turn the key to on, the coolant temperature sensor immediately...
I had to get my coils and spark plugs change all 6. Mechanic said he had take out engine to get to back plugs. He did this and it
A mechanic would never remove the engine to change the spark plugs on 2004 Hyundai Santa Fe. The largest "part" of the engine that is removed to access and replace the sparks plugs is the plenum, which is simply part...
My oil pressure is low light came on
The oil pressure light will usually come on when a few things could be happening. Either the motor is in fact low on oil, the oil pump could be failing or the oil pressure sending unit (https://www.yourmechanic.com/services/oil-pressure-sensor-replacement) is not working...
no key detected
Hi there. It's quite possible that your key's battery has worn out; which typically causes this issue to occur. When your battery dies in your key you should be able to start your car as normally for a while. The...
Related articles
P2705 OBD-II Trouble Code: Transmission Friction Element F Apply Time Range/Performance
P2705 means there is a malfunction in the transmissions friction elements due to failing transmission components, low fluid level or electrical issues
P0676 OBD-II Trouble Code: Cylinder 6 Glow Plug Circuit
P0676 means that the glow plug has failed to heat up properly and could be damaged due to a defective glow plug, module, timer, or relay.
P0864 OBD-II Trouble Code: Traction Control Module (TCM) Communication Circuit Range/Performance
P0864 means there is an issue with the communication circuit in the traction control module, likely due to a defective ON/OFF switch or module itself.
Browse other content
Services
Maintenance
Estimates