Honda Fuel System / EVAP Fault Codes — Causes, Symptoms & Repair

Browse 14 fuel system / evap fault codes relevant to Honda vehicles. A fault code identifies the system reporting an out-of-range condition; accurate repair starts with a full diagnostic scan and live-data checks, not a parts guess.

Common Honda Fuel System / EVAP Fault Codes

• P0170 — Fuel Trim Malfunction (Bank 1)
• P0172 — System Too Rich (Bank 1)
• P0175 — System Too Rich (Bank 2)
• P0190 — Fuel Rail Pressure Sensor Circuit
• P0191 — Fuel Rail Pressure Sensor Range/Performance
• P0193 — Fuel Rail Pressure Sensor High Input
• P0440 — EVAP Emission Control System Malfunction
• P0441 — EVAP Purge System Performance
• P0442 — EVAP System Small Leak Detected
• P0443 — EVAP Purge Control Valve Circuit
• P0446 — EVAP Vent Control Circuit
• P0455 — EVAP System Gross Leak Detected
• P0456 — EVAP System Very Small Leak
• P0457 — EVAP System Leak — Fuel Cap

What to Do When a Warning Light Appears

• Record the warning message and any change in how the car drives.
• Avoid long or high-load driving if the warning is flashing, the car is overheating, or it has entered limp mode.
• Book a diagnostic scan so the stored code, live data and root cause can be checked before parts are replaced.