For the MG MG4, get the correct bulb code first by popping a bulb out and reading the metal cap (T10, festoon length or BA9s). A CANbus-ready bulb carries a built-in resistor or intelligent driver that mimics a halogen bulb’s current draw, and is needed if the car is strongly or moderately sensitive; a standard LED is fine if it is only mildly sensitive.
Fit facts at a glance
| Fact | Value |
|---|---|
| CANbus sensitivity | Mildly on the MG MG4 |
| Common interior sockets | T10 (W5W), festoon (36-42 mm), BA9s |
| Colour temperature sweet spot | 4000-5000K neutral white |
| Factory LED cabin fit | Standard on higher trims |
| CANbus-ready bulb premium | Small - usually a few pounds per pack |
MG electronics are only mildly CANbus-sensitive; standard LED interior bulbs usually swap in without warnings. Note the MG MG4 already ships with factory-fit LED cabin lighting on higher trims - the swap only matters if you have an entry EV trim with halogen bulbs (which are increasingly rare on new EVs).
What to look for on the listing
- Correct bulb code (T10, festoon length, BA9s) - pop one out and read the metal cap.
- CANbus-ready if the car is strongly or moderately sensitive; standard OK if mildly.
- Single colour temperature across the whole set (4000-5000K).
- 12V rated (not 5V or 24V - some listings misprint).
Frequently asked questions
What is a CANbus-ready bulb?
A bulb with a built-in resistor or intelligent driver that mimics the current draw of a halogen bulb, stopping the CANbus system from thinking the bulb has failed.
Do LED interior swaps void a warranty?
Not by themselves. The bulb is a wear item; swapping it does not affect a powertrain or infotainment warranty. Reversibility means the original can go back in for a service.