SSM74404

5/2/2019
TOPIx - SSM74404 - Discovery Sport and RR Evoque equipped with 2.0L Petrol GTDi Check Engine Lamps with DTC P0420-00
Reference
SSM74404
Models
Discovery Sport / L550
Range Rover Evoque / L538
Title
Discovery Sport and RR Evoque equipped with 2.0L Petrol GTDi Check Engine Lamps with DTC P042000
Category
Engine
Last modified
30-Apr-2019 00:00:00
Symptom
403000 Exhaust System Concerns
Content
Issue:
Degradation of the primary catalytic converter. The DTC P0420-00 stored in the PCM indicates the
primary catalyst is not operating at an optimal level.
Cause:
Fueling strategy when the engine is operated in overrun excessively and repeatedly during the warm up
phase.
Action:
The DTC is monitored by the PCM, comparing O2 sensor readings from the front and mid oxygen
sensors to determine the efficiency of the primary catalyst. While other components can impact the
operation of the primary catalytic converter, the DTC P0420-00 will only be set based on the catalytic
converter efficiency. Additional DTCs would likely be stored if other components are not operating as
specified.
Reference TOPIx workshop manual section 100-00: General Information > Diagnostic Trouble Code
Index GTDi 2.0L Petrol/GDTi 2.0L Petrol – SULEV, DTC: Engine Control Module (ECM) for diagnostic
guidance:
Diagnose and repair any related DTC stored.
Inspect for and repair any leaks in the exhaust system.
Inspect for and repair any intake system unmetered air leaks.
Inspect for and repair any causes of misfire in the ignition system.
Carry out oil consumption checks.
If other components pass testing (e.g. O2 sensors, secondary catalyst, etc.) do not replace. Replace only
the primary catalytic converter. Reference TOPIx workshop manual section 309-00A: Exhaust System –
GTDi 2.0L Petrol/GTDi 2.0L Petrol – SULEV > Removal and Installation > Catalytic Converter for repair
procedures. Inquire with the vehicle owner to determine if the vehicle is often operated in an overrun
during warm up, i.e. driven downhill during warm up as part of a daily commute. Raise an EPQR and
include information on normal driving patterns. This condition is currently under investigation.
https://topix.landrover.jlrext.com/topix/content/document/view?id=989428
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