P1226 – Fuel Tank Pressure Too High
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Symptoms
- Fuel tank hiss when opening cap
- Fuel odor
- Possible drivability issues
- Check engine light
- Emissions failure
Causes
- Blocked vent line
- Stuck closed vent valve
- Saturated canister
- Kinked hoses
- Tank pressure sensor error
Diagnosis
- Check tank pressure data
- Inspect vent lines
- Test vent valve
- Inspect canister
- Smoke test EVAP
Repair
- Repair or replace vent lines
- Replace vent valve
- Replace canister
- Replace tank pressure sensor
- Clear codes and retest