P04F0
EVAP System High Load Purge Line A Performance
Generic OBD-II
Real-world scan data
Seen in
56
scans in the past year
Found in
<0.1%
of scans
<0.1%
of scans that found faults
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check the EVAP canister purge valve for any obstructions or damage
- Inspect the EVAP system for any leaks or loose connections
- Replace the purge line or hose if it is damaged or worn out
- Clean or replace the EVAP charcoal canister if it is saturated or malfunctioning
- Inspect the EVAP system for any faulty sensors or components
Common causes
Most likely first
- Blocked or clogged EVAP purge line
- Faulty EVAP purge valve or solenoid
- Leaking or damaged EVAP canister
- Malfunctioning fuel pressure sensor
- Faulty charcoal canister
How to diagnose & fix
Work through it in order
- Check Engine Light (CEL) turns on
- Decreased fuel efficiency
- Difficulty starting the vehicle
- Rough idling or engine misfires
- Strong fuel smell
Read & clear P04F0 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.