high severity
adas calibration
2022—2024
dealer
MG MG4 EV adas calibration (2022—2024)
MG MG4 EV · 2022—2024 · all trims
Diagnostic code reference
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Reported symptoms
- Lane-keep assist steers the vehicle toward the centerline or into the oncoming lane on narrow roads
- Lane-departure warning triggers when the vehicle has not actually crossed a lane marking
- Lane-keep system steers across the centerline on roads with clearly defined markings
- Inconsistent or unpredictable lane-keep behavior between similar driving conditions
- Lane-keep assist remains active in settings where the owner manual indicates it should be disabled
- Phantom steering inputs from the ADAS system, particularly when passing oncoming traffic
Questions to ask
Pose these to the service advisor at intake. Request answers in writing or via email.
- Has the February 2025 software update addressing the lane-keep assistance and lane-departure warning calibration been applied to this VIN ?
- What software version is currently installed on the ADAS control module, and what version will be installed today?
- After the update, is recalibration of the front camera or other ADAS sensors required, and is that calibration included in the visit scope?
Documents to request
Each item should be received in writing before authorizing repair work.
- Diagnostic report listing all stored, pending, and historical fault codes related to the ADAS, lane-keep, and camera modules
- Repair order with technician notes describing the software update and any sensor calibration performed
- Reference number of the service bulletin or campaign cited during the update
Pre-service evidence
Capture before drop-off. Once the vehicle leaves your possession, proving prior condition becomes significantly harder.
- If you have experienced unsafe lane-keep behavior, document the scenario in writing: road type, weather, time of day, vehicle speed, and the direction the lane-keep system steered
- Note whether the front camera or windshield has been replaced, recalibrated, or had any work done previously
- If you reported the issue in writing prior to the visit, retain that correspondence
Service advisor interaction
Operational notes specific to the conversation at the service desk.
- Record the service advisor's name and the date and time of each conversation
- Note whether the visit is classified as service campaign, software bulletin, warranty, or paid service — coverage classifications differ
- If the dealership characterizes the lane-keep concern as 'within specification' or 'unable to reproduce' rather than addressing the February 2025 update, request that the update reference be checked against the VIN and documented in writing
- Document any reference to the Which? investigation or the February 2025 MG software action when discussing the issue
Repair authorization
Cautions before signing.
- If the lane-keep software update is classified as a manufacturer-funded action, no owner cost should apply. Confirm in writing before authorizing if any charges are presented.
- If sensor recalibration is recommended beyond the software update, request the diagnostic basis and the warranty classification in writing
- Repair authorization forms may include language permitting additional related work — read carefully and decline blanket scope additions
- If the dealership recommends camera replacement, request written documentation of the diagnostic finding that justifies replacement rather than calibration
Post-service verification
Complete before leaving the service location. Issues that surface after departure are operationally harder to attribute to the visit.
- Verify lane-keep assistance and lane-departure warning behavior on a varied test route, including narrow roads where the issue was originally documented
- Confirm no ADAS, lane-keep, or camera warning messages appear after a full ignition cycle
- Confirm the repair order matches the work performed and references the correct software version and campaign or bulletin number
- Verify that any sensor calibration is reported with measured values rather than only a pass/fail line
- Note odometer reading and any test-drive distance attributed by the dealership at pickup
Email templates
Documentation-focused templates for service correspondence. Tap copy to use. Subject and body are kept verbatim — paste them as-is into your email client.
Service inquiry — MG4 EV lane-keep assistance update (February 2025), request for written confirmation
Service Department,
I am scheduling my [YEAR] MG MG4 EV, VIN [VIN], to receive the software update issued by MG Motor UK in February 2025 addressing lane-keep assistance and lane-departure warning calibration.
Before the appointment, I am requesting written confirmation of the following:
1. Whether this update has already been applied to this VIN, and if so, the version installed.
2. The target software version after this visit.
3. Whether any ADAS sensor recalibration is part of the update procedure.
4. The work-scope classification — manufacturer service action, warranty, or paid service.
Please reply to this email so the visit is properly documented.
Thank you,
[NAME]
Follow-up — written confirmation of ADAS software update on [DATE]
Service Department,
Following my appointment on [DATE] for VIN [VIN], I am requesting written confirmation of the following:
1. ADAS, lane-keep, and camera fault codes recorded during diagnosis.
2. Software versions installed before and after the visit on the ADAS control module and related modules.
3. Any sensor recalibration performed, with measured values where applicable.
4. Reference number of the service bulletin or campaign applied.
5. Coverage classification — service action, warranty, or paid.
Please reply to this email at your convenience.
Thank you,
[NAME]
Warranty notes
- ADAS software updates are typically delivered at no cost when issued as a manufacturer service action. Charges presented in connection with the February 2025 lane-keep update should be confirmed in writing before authorization.
- Owners who experienced ADAS-related incidents prior to the update may have additional documentation needs if seeking goodwill consideration. Records of incident details are relevant to that conversation.
- Repairs performed under goodwill do not extend the warranty period. Confirm in writing whether work is classified as warranty, service campaign, or goodwill.
Observational patterns
The MG4 lane-keep update is delivered at dealer service centers; OTA has not been used.
The defect was documented by Which? consumer testing in 2024, with the manufacturer software response published in February 2025. Reports preceding the update characterized the system as steering toward the centerline on narrow roads and toward the wrong side on roads with clearly defined markings.
Where owners have reported the issue at service and the dealership classifies it as 'within specification,' written reference to the February 2025 software action has, in some service interactions, changed the visit scope.
MG4 owners have reported infotainment and ADAS updates being bundled into the same dealer visit. Itemizing each update on the repair order is consistent with later documentation needs.
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