• posted by Craig Murray

The P0456 EVAP System Very Small Leak Detected fault indicates that the engine control module (ECM) has detected a very small leak within the Evaporative Emission Control (EVAP) system. During scheduled self-tests, the ECM seals the EVAP system and monitors fuel tank pressure over a specified period. If a slight pressure loss exceeding the manufacturer’s threshold is detected, indicating a very small vapour leak, the ECM stores DTC P0456. This fault applies to the MG ZS Gen2 (ZS11 platform), introduced from 2024 onwards.

• posted by Craig Murray

The P0455 EVAP System Large Leak Detected fault indicates that the engine control module (ECM) has identified a significant leak within the Evaporative Emission Control (EVAP) system. During self-diagnostic leak tests, the ECM seals the EVAP system and monitors fuel tank pressure. If the system is unable to maintain the required pressure because of a large leak or disconnected component, the ECM stores DTC P0455. This fault applies to the MG ZS Gen2 (ZS11 platform), introduced from 2024 onwards.

• posted by Craig Murray

The P0442 EVAP System Small Leak Detected fault indicates that the engine control module (ECM) has identified a small leak within the Evaporative Emission Control (EVAP) system. The ECM performs leak integrity tests by sealing the EVAP system and monitoring fuel tank pressure changes. If it detects a pressure loss that exceeds the allowable limit for a small leak, it stores DTC P0442. This fault applies to the MG ZS Gen2 (ZS11 platform), introduced from 2024 onwards.

• posted by Craig Murray

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.

• posted by Craig Murray

The P0420 Catalyst System Efficiency Below Threshold fault indicates that the engine control module (ECM) has determined the catalytic converter is no longer reducing exhaust emissions efficiently on Bank 1. The ECM detects this condition by comparing the switching patterns of the upstream and downstream oxygen sensors during closed-loop operation. If both sensors display similar readings, the catalytic converter is considered to have insufficient oxygen storage capacity and catalyst efficiency. This fault applies to the MG ZS Gen2 (ZS11 platform), introduced from 2024 onwards.

• posted by Craig Murray

The P0304 Cylinder 4 Misfire Fault indicates that the engine control module (ECM) has detected repeated combustion failures in cylinder 4. This fault affects the engine management, ignition, and fuel injection systems and is identified by monitoring crankshaft speed fluctuations that correspond to misfires occurring specifically in cylinder 4. It applies to the MG ZS Gen2 (ZS11 platform), introduced from 2024 onwards.

• posted by Craig Murray

The P0303 Cylinder 3 Misfire Fault indicates that the engine control module (ECM) has detected repeated combustion failures in cylinder 3. This fault affects the engine management, ignition, and fuel injection systems and is identified by monitoring crankshaft speed fluctuations that correspond to misfires occurring specifically in cylinder 3. It applies to the MG ZS Gen2 (ZS11 platform), introduced from 2024 onwards.

• posted by Craig Murray

The P0302 Cylinder 2 Misfire Fault indicates that the engine control module (ECM) has detected repeated combustion failures in cylinder 2. This fault affects the engine management, ignition, and fuel injection systems and is identified by monitoring crankshaft speed fluctuations that correspond to misfires occurring specifically in cylinder 2. It applies to the MG ZS Gen2 (ZS11 platform), introduced from 2024 onwards.

• posted by Craig Murray

The P0301 Cylinder 1 Misfire Fault indicates that the engine control module (ECM) has detected repeated combustion failures in cylinder 1. This fault affects the engine management, ignition, and fuel injection systems and is identified by monitoring crankshaft speed fluctuations that correspond to misfires occurring specifically in cylinder 1. It applies to the MG ZS Gen2 (ZS11 platform), introduced from 2024 onwards.

• posted by Craig Murray

The P0300 Random Misfire Fault indicates that the engine control module (ECM) has detected multiple or randomly occurring engine misfires that cannot be attributed to a single cylinder. This fault affects the engine management, ignition, and fuel injection systems and is detected by monitoring crankshaft speed variations that indicate incomplete or inconsistent combustion events. It applies to the MG ZS Gen2 (ZS11 platform), introduced from 2024 onwards.