Troubleshoot by symptom

Symptom

• ABS warning light stays on while driving
• ABS and stability functions disabled while the light is lit
• Light appears after driving through deep water or potholes, then clears
• Intermittent light that corresponds to hitting a bump

Cause

A wheel speed sensor can fail or get fouled by metal debris, cutting the speed signal to the ABS module. Sensor failures are among the most commonly cited causes of the ABS light in Myvi owner groups. On some cars the wiring harness to a sensor survives. On D20N Myvis the front sensors carry Perodua-style codes of the 89542-BZ120 / 89543-BZ120 type as listed by local parts sellers, but sensor codes vary by position and year, so confirm before ordering.

Solution

A workshop reads the stored ABS code and it names the wheel. Tell them when the light came on, whether it was deep water or a pothole, and whether it clears by itself. That story points at dirt on a sensor rather than a dead unit. A basic scan runs RM80 to RM150, a full all-module read RM150 to RM250, and most shops waive the fee if you book the repair with them. A replacement sensor lands around RM190 fitted. Braking feel stays normal with ABS disabled, but stopping distances on loose or wet surfaces get worse, so do not sit on it for months.

Estimated cost:~RM 190·Low cost·fitted · undated

Symptom

• Vent air cools weakly, worst in slow traffic and afternoons
• Compressor clutch cycles on and off rapidly
• Cold at highway speed but weak at idle
• Oily residue around condenser pipes or hose joints (leak indicator)

Cause

Reported Myvi aircond failures cluster around three causes: refrigerant leaking past aged O-rings or the condenser, a worn Denso compressor whose magnetic clutch starts slipping, and clogged condenser fins that cannot reject heat in urban traffic. The compressor is the expensive one; separate Malaysian price guides put a new original Denso compressor well above a reconditioned or OEM-market replacement once labour is added.

Solution

Get a pressure test and leak check first. Clean the condenser and fan before replacing anything, since a blocked condenser alone mimics a weak compressor. Regas with the correct measured charge if the system holds. If the clutch slips constantly or the compressor rattles, replace it; a reconditioned Denso unit is the budget path, a new Denso unit the durable path. Change the receiver-drier every time the circuit is opened.

Estimated cost:~RM 300·Moderate·basis not stated · as of Nov 1, 2026

Symptom

• Engine dies while idling at a junction, a car park or a drive-through
• Long crank before it fires, and sometimes no start at all
• Power drops away under load, then comes back after a restart
• No warning light, no stored complaint the owner can see

Cause

The Denso fuel pump fitted to early third-generation Myvis came from a batch caught in a global Denso recall. Solvent used during production was left drying for too long, which could crack the pump's surface and let it absorb fuel until the impeller deformed and the pump stopped. Perodua ran it as a special service campaign rather than a public recall: owners of affected cars were written to in stages, and the pump was swapped free. Cars built from October 2019 onward are not in the affected build range.

Solution

Ask a Perodua service centre whether your car is in the campaign, using the chassis and engine numbers rather than the registration date. The replacement costs nothing and takes about half a day. Perodua said the failure shows up when the car is stationary rather than at speed, but a car that has just cut out at a traffic light is a car that will not restart, so do not leave it on the list for months. If the pump has already been changed, the invoice is the proof, and it is worth keeping with the service book when you sell.

Estimated cost:~RM 0·Free·basis not stated · as of Nov 1, 2026

Symptom

• Shuddering or vibration at low speeds (10-30 km/h)
• Hesitation when accelerating from standstill
• Unusual noise from transmission at low RPM

Cause

The Perodua CVT uses a belt-and-pulley system that can develop shudder as the CVT fluid degrades. Low-speed shudder is more pronounced in stop-go traffic and worsens in hot climates.

Solution

CVT fluid replacement with OEM-spec CVTF FE often resolves the issue. If the problem persists after fluid change, inspect the CVT belt for wear. Early detection prevents costly repairs.

Estimated cost:~RM 180·Low cost·basis not stated · undated

Symptom

• Vibration felt through steering wheel and dashboard at idle
• Clunking noise when shifting from Park to Drive
• Engine movement visible when revving in neutral

Cause

The Myvi's engine mounts use rubber bushings to absorb vibration. Over time, especially in stop-go traffic conditions common in Malaysian cities, the rubber deteriorates and cracks. The left-hand (passenger-side) mount is most prone to failure due to engine torque loading.

Solution

Replace the worn engine mount. The left-hand mount is the most commonly affected. Inspect all three mounts when one fails; the others may be close to end of life. Using OEM mounts is recommended for best NVH performance.

Estimated cost:~RM 150·Low cost·basis not stated · undated

Symptom

• Idle flutters or hunts between low and normal rpm
• Creep feels jerky at parking speed (CVT surge from idle instability)
• Idle dips when the aircond compressor kicks in
• Slight hesitation when pulling away from a stop

Cause

Carbon and oil vapour deposits build up in the throttle bore and on the butterfly plate and idle air passages. Malaysian servicing guides describe sticky throttle body deposits as a routine Myvi issue in the 40,000-80,000km window, and it is worse on cars with higher idle hours in traffic.

Solution

A workshop cleans the throttle body and finishes with an idle relearn on a scan tool. A spray-only clean runs RM80 to RM120 and often comes back. A full clean with the relearn runs RM150 to RM250. Tell them the idle hunts and dips when the aircond cuts in, so they start at the throttle body rather than the gearbox. Leave the relearn to the shop that did the work. The battery disconnect trick at home is a coin toss, and a bad idle for a week is a poor way to save RM40.

Estimated cost:~RM 180·Low cost·basis not stated · undated

Symptom

• Fan runs only on the highest setting; the lower speeds do nothing
• The fan works, then stops on one setting and later comes back
• Air stays cold at full blast but the cabin is noisy and the cold is uneven
• Speed settings die one at a time, starting with the slowest

Cause

The blower resistor pack, which is the fan speed control, sits in the air stream behind the glovebox and drops voltage for each speed below maximum. When it fails, the top setting keeps working because full speed bypasses the resistor, so the fan appears healthy while every other setting is dead. Heat and damp in a Malaysian cabin are what kills it, not the blower motor.

Solution

Replace the resistor pack rather than the blower motor. A workshop reaches it behind the glovebox in half an hour, and the part is sold for the third-generation car by Malaysian listings. Budget RM80 to RM140 fitted at 2026 prices. If nothing works on any setting, including the top one, that is the motor or its fuse and a different job.

Estimated cost:~RM 120·Low cost·fitted · as of Nov 1, 2026

Symptom

• Rattling noise from dashboard area on rough roads
• Squeaking from A-pillar trim
• Loose centre console feel

Cause

Early production Myvi models (2018-2020) had fit-and-finish issues where interior trim clips were not tightly secured. The dashboard and A-pillar trim are particularly prone to vibration.

Solution

Apply adhesive-backed felt tape to contact points behind trim panels. Replace broken plastic clips. Most rattles can be eliminated for under RM10.

Estimated cost:~RM 10·Free·basis not stated · undated

Symptom

• Whistle or whine that follows road speed, loudest from about 40 to 80 km/h
• Appears when you press the accelerator and fades when you lift off
• Easy to hear with the radio off, and easier with passengers in the car
• No shudder, no delayed engagement, no warning light

Cause

The D-CVT fitted from the November 2021 facelift uses a belt and pulley set, and the belt runs under load at a pitch the cabin hears as a whistle. Owners who took the car to a Perodua service centre were told it is the gearbox characteristic, and a technician demonstrated it on other D-CVT Myvis, including a 1.5. The pre-facelift four-speed automatic does not make the sound at all, which is why people who traded up notice it immediately.

Solution

Nothing needs replacing when the noise is the belt whine: it is how the gearbox sounds, and it does not get worse with mileage in the reports so far. Two things separate it from a fault. A failing alternator or belt idler will also whine with the car standing and the engine revved in neutral, because it is driven by the engine rather than by road speed. A CVT that is actually slipping comes with revs that climb without the car speeding up, shudder on pull-away, or a delayed engagement when you select drive.

Estimated cost:~RM 0·Free·basis not stated · as of Nov 1, 2026

Symptom

• Window moves slowly or gets stuck halfway
• Window drops slightly when fully closed (anti-pinch misalignment)
• Window regulator makes grinding noise

Cause

Early production Myvi models (2018-2021) used a window motor and regulator assembly that can wear prematurely. The motor brushes wear down and the regulator cables can fray, especially on frequently used windows (driver's side is most affected).

Solution

Replace the window regulator assembly. The motor and regulator are sold as a single unit. Lubricate the window channel with silicone spray during replacement to extend the life of the new unit.

Estimated cost:~RM 80·Low cost·basis not stated · undated