BYD M3 Parts
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Symptom Finder: Known Weak Points
| What you see or hear | Check first |
|---|---|
| Sliding side door dragging, sticking or rattling | The rollers, guides and latches. Look for worn rollers or debris in the rail before ordering a new rail, and order parts for the correct side by OE number. |
| Rear of the car sitting low or knocking over bumps | The leaf springs, U-bolts, shackles and eye bushes on the rear axle. Check the bushes and U-bolts first, then match the spring by the OE number on the old one. |
| Brake judder, squeal or uneven pedal feel | Pads and discs. The car has discs at both ends, so check both axles and order pads and discs for the axle that needs them. |
| Engine warning light on an M3 DM | Start with the lambda and emission sensors and the ignition parts on the naturally aspirated 1.5-litre engine. Order parts for that engine, not for a turbocharged BYD 1.5. |
| Charging fault or slow charging on an electric M3 | The charging socket, cable and on-board charger. DC charging rates and hardware differ between versions, so match each part by the OE number on the unit fitted. |
| Tyres wearing fast or sidewalls bulging under load | Check that the tyres fitted are C-rated commercial tyres of 195/60 R16C with the correct load index, then order to that rating. |
| Weak heating, poor demisting or little air from the vents | The blower, heater core and evaporator. Check the blower first, since it runs for long hours on a fleet car, and order by OE number. |
Most Replaced Parts on the M3
- Brake calipers, cylinders and hydraulicsDiscs front and rear on the van-based running gear, so order calipers and pads by axle
- Sliding door rails, rollers and latchesSliding side doors see heavy daily use in taxi and fleet work
- Electric coolant pumpsThe electric drive and charging hardware rely on a pumped coolant circuit
- Evaporator, blower and heater core partsClimate hardware for a tall seven-seat cabin, often run all day in fleet use
- High-voltage fuses and service disconnectsHigh-voltage protection and isolation hardware on the electric and plug-in hybrid versions
About BYD M3 Parts
The BYD M3 is a compact MPV built on the same body as the BYD T3 electric van. It measures 4,460 mm long on a 2,725 mm wheelbase. The M3 was shown in 2014 as a petrol car and as the M3 DM plug-in hybrid with a naturally aspirated 1.5-litre engine and an electric motor, and filings were made for both, but the version sold in volume is battery-electric with a single electric motor. It has been sold as the T3 van from 2015 and as the M3 passenger MPV in China from 2019. Its running gear comes from a light van. There are MacPherson struts at the front, a leaf-sprung rear axle, disc brakes at both ends and commercial 195/60 R16C tyres. The car therefore needs van-style suspension and tyre parts alongside the seats, glass and trim of a passenger car. Every part on this page is listed by its OE number, and that number is the surest way to confirm a part fits.
What to know before buying BYD M3 parts
Start by confirming which version you have. The M3 shares its body with the T3 electric van. Both measure 4,460 mm long, 1,720 mm wide and 1,875 mm tall on a 2,725 mm wheelbase, so body panels, the tailgate and much of the running gear follow the same design. Seats, side glass and cabin trim belong to the passenger versions, and a van cannot supply them.
The biggest split is in the powertrain. The M3 was shown in 2014 as a petrol car and as the M3 DM plug-in hybrid, but the version sold in volume is battery-electric, and we have found no evidence that the petrol or hybrid versions went into volume production. The hybrid pairs a naturally aspirated 1.5-litre engine of 109 hp with a 150 hp electric motor and a 15.98 kWh battery, and its engine parts do not cross to BYD's turbocharged 1.5-litre engines. Electric versions have been built with different battery chemistries and motor outputs. Battery, battery management, motor and charging parts must therefore be matched by the OE number on the part fitted, never by the badge. DC charging rates differ between versions, so charging hardware varies too.
The running gear comes from the van. MacPherson struts sit at the front and a leaf-sprung axle at the rear, with disc brakes at both ends, so order pads and discs by axle. Tyres are 195/60 R16C, a commercial size with a reinforced casing, and a passenger tyre of the same size carries a lower load rating.
A few things vary from car to car. Seat layouts differ between versions, so count the seats before ordering frames, runners or latches. The sliding side doors wear their rollers and latches quickly in taxi and fleet work, and the parts are handed, so order for the correct side. For painted panels, give the colour code on the car rather than a colour name. We have found no dated facelift for the M3, so the OE number on the old part is a better check than the year.
Before You Order: 7 Checks
- Confirm which version the car is before ordering anything for the engine, battery or drive, since the M3 sold in volume is battery-electric and we have found no evidence that petrol or plug-in hybrid versions reached volume production.
- Match the OE number on the part you are replacing to the OE number on the listing, and order by that number rather than by the M3, T3, ETP3 or M3e name.
- Read the OE number on the battery, battery management unit or motor before ordering, since electric versions have been built with different battery chemistries and motor outputs.
- Read the full tyre size, including the C and the load index, from the sidewall before ordering tyres.
- Count the seats and rows in the car before ordering seat frames, runners or latches.
- Inspect the rollers before replacing a sliding door rail, and order door parts for the correct side.
- Order painted panels by the colour code on the car rather than by colour name.
Generations and Facelifts
The M3 story starts with the M3 DM concept, a compact plug-in hybrid MPV shown at the Beijing Auto Show in April 2014. It paired a naturally aspirated 1.5-litre petrol engine of 109 hp with a 150 hp electric motor, giving 259 hp combined and around 60 km of electric range, and it was announced for pre-sale that July. We have found no evidence that it went into volume production. A petrol version was shown alongside it, listed with a 1.5-litre turbocharged engine, and filings were made for both, but we have found no evidence that either was sold in volume.
The battery-electric van, the T3, was launched at the Shanghai Auto Show in 2015 on the same 4,460 mm body and 2,725 mm wheelbase. The electric M3 is its passenger form, and the two share their leaf-sprung rear axle, disc brakes and electric drive. For parts, running gear often crosses between the van and the MPV, while seats, glass and trim do not.
Outside China, the van is also sold as the ETP3 and the electric MPV as the M3e in some markets.
We have found no facelift or dated model-year update for the M3. The body shape has stayed the same throughout, and the splits that matter for parts run between versions rather than between years. If a part appears to have changed during production, read the build date on the identification plate and match the part by its OE number.
BYD M3 Parts: Frequently Asked Questions
How do I make sure a part fits my BYD M3?
Match the OE number. Every part on this site is listed under the OE number printed on the original part, and if the number on the part you are replacing matches the listing, the part fits. That check matters on the M3 because the same body was shown with petrol and plug-in hybrid powertrains as well as the battery-electric drive sold in volume, and has been sold under several names in different markets. If the old part is missing or its number cannot be read, send us a photo through the quote form and we will reply within 24 hours, usually sooner.
Is the M3 the same vehicle as the BYD T3?
They share one body. The T3 is the electric van version, and outside China the same body is also sold as the ETP3 and the M3e. All of them measure 4,460 mm long, 1,720 mm wide and 1,875 mm tall on a 2,725 mm wheelbase. Running gear such as the struts, the leaf-sprung rear axle and the brakes follows the same design, while seats, side glass and interior trim belong to the passenger versions. Match each part by the OE number on the old part rather than by the badge on the tailgate.
Is the battery in an electric M3 lithium iron phosphate or NCM?
It depends on the car. Electric versions have been built with different battery chemistries and motor outputs, and BYD's own sources disagree on the chemistry, so the name on the car cannot settle it. Order the battery, battery management parts and motor by the OE number on the part fitted, and ask us through the quote form if that number cannot be read.
Will engine parts from another BYD 1.5-litre hybrid fit the M3 DM?
Not on displacement alone. The M3 DM uses a naturally aspirated 1.5-litre four-cylinder petrol engine of 109 hp, working with a 150 hp electric motor and a 15.98 kWh battery. Several BYD plug-in hybrids, including the earlier Qin DM, use a turbocharged 1.5-litre engine, and the petrol-only M3 was also listed with a 1.5-litre turbo. Turbocharged and naturally aspirated engines differ in their intake, sensors and many ancillaries, so a part from another model can look right and still not fit. Order engine parts by the OE number on the part you are replacing.
Why does the M3 have leaf springs when it carries passengers?
Because it shares its running gear with the T3 van. The front uses MacPherson struts and the rear a leaf-sprung axle, the layout the van needs to carry a payload. The springs, U-bolts, shackles and eye bushes are van parts and wear as van parts do, especially on a car used for taxi or fleet work. Check for sagging and worn bushes before ordering, and match the spring by the OE number on the old spring rather than by the car's name.
My tyres read 195/60 R16C. Does the C matter?
Yes. The C marks a commercial tyre with a reinforced casing and a higher load rating than a passenger tyre of the same size. The van-based M3 body runs 195/60 R16C, and a passenger 195/60 R16 matches the size while carrying less load, which matters on a car that may run full of passengers and luggage. When ordering, match the full size including the C, along with the load index printed on the sidewall of the tyres already fitted, and order rims to the same 16-inch size.
Does the M3 have drum brakes at the rear like many small vans?
No. The van version has disc brakes at both ends, with ABS. Pads and discs differ front to rear, so order them by axle and by the OE number on the old part. Brake parts from a drum-braked van of a similar size will not suit. On a hard-working fleet car, check the discs for scoring and a worn lip each time the pads are changed, and replace discs in pairs on the same axle.
What wears on the sliding side doors?
The M3 uses sliding side doors, and each door runs on rollers along its rails and closes onto latches. On a car used for taxi or passenger work those doors open and close many times a day, so the rollers, guides and latches wear faster than they would on a private car. If a door drags, sticks or rattles, check the rollers and the rail for wear or trapped debris before ordering a new rail. Door parts are handed, so order for the correct side and match each by OE number.
Are seat parts the same across every M3?
Not always. The M3 has been offered with more than one seat layout, and the van version has only the front row. Seat frames, runners, latches and mountings follow the layout rather than the model name, so count the seats and rows in the car before ordering. Order each seat part by the OE number on the old part. If the number is missing, send us the layout and a photo through the quote form.
Does a battery-electric M3 still need service parts?
Yes, though fewer than a car with an engine. The electric version has no engine oil, oil filter or spark plugs. It still needs brake pads and discs, brake fluid, a cabin air filter, wiper blades, tyres and the bushes that wear on any leaf-sprung axle, and its motor and power electronics rely on a coolant circuit. The M3 sold in volume is battery-electric, and we have found no evidence that the M3 DM plug-in hybrid reached volume production. Confirm which version you have before ordering, then match each part by OE number.
Are charging parts the same on every electric M3?
Not necessarily. DC fast charging rates differ between versions, and charging socket standards also differ, so a socket or cable taken from one electric M3 may not suit another. Check the socket type on the car before ordering. Then order the on-board charger, charging socket and related wiring by the OE number on the part fitted, and ask us through the quote form if that number cannot be read.
Has the M3 had a facelift, and do build dates split parts?
We have found no facelift or dated model-year change for the M3. The splits that matter run between versions rather than between years, such as passenger MPV or van. For that reason the OE number on the old part is a better guide than the year. If you think a part changed during production on your car, read the build date on the identification plate and include it with your quote request.