Fuel Cap
Fuel Tank Filler Neck
EVAP System Hoses
Fuel Tank Sending Unit Gaskets or Seals
Purge Solenoid or Valve
Charcoal or Vapor Canister
Fuel Tank
Fuel Tank Pressure Sensor
The necessary parts and tools to clear this Diagnostic Trouble Code (DTC) might differ depending on your vehicle's make and model. If your Check Engine light is illuminated, stop by any O’Reilly Auto Parts and get an O’Reilly VeriScan® for your car, truck, or SUV and get a detailed VeriScan report with more information about your vehicle’s Diagnostic Trouble Code(s), along with possible causes and repair solutions. If you aren’t comfortable making these repairs yourself, our parts professionals can recommend a local shop to make your repair.
OBD-II fault code P0420 means “Evaporative Emission System Leak Detected” and refers to a small leak. This means your vehicle's EVAP system, which is designed to capture, store, and purge raw fuel vapors, has a small leak.
P0442 Code Diagnosis
When you experience a P0442 diagnostic trouble code, your vehicle may be experiencing failure in one of a few areas:
- Fuel cap
- Fuel tank
- Fuel tank pressure sensor
- Filler neck
- Leak detection pump
- Fuel tank sending unit gasket or seal
- EVAP vent valve or purge valve
- EVAP system hose leaks
- Carbon canister leaks
- Leaks at O-rings or clamps
P0442 OBD-II Code Symptoms
In many cases, there may be no symptoms besides a Check Engine light, but you could notice the smell of fuel vapors.
Symptoms of a P0420 or P0430 Code can include:
- Check Engine light
- Smell of fuel vapors
You probably won’t notice issues with your vehicle’s performance, and it’s okay to drive if you must, but it’s important to have the issue professionally diagnosed and repaired as soon as possible.
If your Check Engine light is on, stop by any O’Reilly Auto Parts location where our Parts Professionals can scan and diagnose your illuminated Check Engine light for free with our exclusive O’Reilly VeriScan code reading service. An O’Reilly VeriScan provides a detailed report of possible causes and solutions or repairs for your illuminated Check Engine light. The O'Reilly VeriScan report, along with the O’Reilly Auto Parts How-To resources can help you understand what parts, tools, and services you need to clear your DTCs and Check Engine lights. If you aren’t comfortable performing any necessary repairs yourself, we are also happy to recommend a local repair shop.
