Symptom hub
Car Runs Rich After Getting Gas: EVAP Purge Flooding vs a True Fueling Fault
If the engine smells rich, blows black smoke, or feels loaded up only after a fill-up, do not treat it like an ordinary injector problem first. That timing strongly suggests the intake is being fed excess vapor through the EVAP system, especially when P0441, P0496, or P0172 travel together.
Likely related codes
Start your diagnostic path here
P0172 — System Too Rich (Bank 1) P0441 — Evaporative Emission Control System Incorrect Purge Flow P0496 — Evaporative Emission System High Purge Flow P0440 — Evaporative Emission Control System Malfunction P0451 — Evaporative Emission Control System Pressure Sensor Range/Performance P0453 — Evaporative Emission Control System Pressure Sensor High Input P0444 — Evaporative Emission Control System Purge Control Valve Circuit Open P0445 — Evaporative Emission Control System Purge Control Valve Circuit Shorted P0497 — Evaporative Emission System Low Purge Flow