MG ZS (Gen2) P0441 EVAP System Incorrect Purge Flow

The P0441 EVAP System Incorrect Purge Flow fault indicates that the engine control module (ECM) has detected an incorrect flow of fuel vapours through the Evaporative Emission Control (EVAP) system during a purge event. The ECM monitors fuel tank pressure, purge valve operation, and engine operating conditions to verify that fuel vapours are being drawn from the charcoal canister into the intake manifold at the expected rate. If the measured purge flow is outside the specified range, the ECM stores DTC P0441. This fault applies to the MG ZS Gen2 (ZS11 platform), introduced from 2024 onwards.

Symptoms

  • Check Engine Light illuminated
  • Fuel smell around the vehicle
  • Increased evaporative emissions
  • Slight rough idle after refuelling
  • Hard starting after filling the fuel tank
  • Reduced fuel economy (in some cases)
  • Failed emissions inspection
  • Additional EVAP-related fault codes may be present

Possible Causes

  • Faulty EVAP purge control valve (purge solenoid)
  • Stuck-open or stuck-closed purge valve
  • Blocked or restricted EVAP hoses
  • Split, disconnected, or leaking EVAP hoses
  • Faulty charcoal canister
  • Faulty fuel tank pressure sensor
  • Damaged or loose fuel filler cap
  • Vacuum leak in the EVAP system
  • Damaged wiring or electrical connectors
  • Engine control module (ECM) fault (rare)

Diagnosis

Diagnosis begins by confirming the stored fault code and reviewing freeze-frame data using a compatible diagnostic scan tool. The EVAP purge valve should be tested for correct electrical operation and proper sealing, while the EVAP hoses, charcoal canister, and fuel filler cap should be inspected for leaks, restrictions, or damage. Live data from the fuel tank pressure sensor and purge system should also be analysed to verify correct purge flow. Manufacturer diagnostic procedures may include smoke testing the EVAP system, activating the purge valve with a scan tool, and checking the integrity of all EVAP components.

For vehicles operating in New Zealand, following OEM diagnostic procedures helps distinguish between purge valve faults, vacuum leaks, and sensor-related issues, reducing unnecessary replacement of EVAP components.

Accurately diagnosing this fault often requires manufacturer testing procedures, wiring diagrams, connector pinouts, EVAP system schematics, fuel tank pressure sensor specifications, smoke test procedures, and system calibration information. Access to the factory service manual significantly reduces diagnostic time and helps prevent unnecessary parts replacement.

Applicable Years

2024, 2025, 2026, onwards

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