Car Diagnostic Inspection for Proton
A diagnostic inspection identifies why warning lights appear or why your Proton is running poorly. It costs RM 80 for a small car or RM 120 for a large one and takes about an hour.
What symptoms show up on a Proton that need diagnosis?
A check engine light is the clearest sign. Warning lights on the dash, loss of power, rough idle, strange noises, intermittent cutting out, or cooling and air-conditioning faults often point to electrical or sensor faults that need pinpointing before repair work starts.
Why do Proton Saga, Persona, and X-series models commonly need diagnostics?
Battery and charging-system faults are routine on these models as they age. Cooling and air-conditioning leaks can trigger warning lights. Braking and suspension wear sometimes generates electrical faults in sensor circuits, not just mechanical wear—diagnostic inspection separates electrical problems from wear.
What does the diagnostic inspection actually check?
The workshop reviews your description of the symptom, scans the engine computer for stored fault codes, and carries out a visible multi-point inspection of wiring, connectors, and obvious leaks. You then receive findings and a quote for the next step.
When should you book diagnostics instead of waiting?
If the check engine light stays on, gets worse, or the car loses power, book immediately—delay risks damage to the catalytic converter or engine. If the light flickers and the car runs normally, you have time to confirm the route and send details on WhatsApp before setting off.
Proton symptoms, likely causes, and what the inspection checks
| Symptom | Likely Cause | Inspection Checks |
|---|---|---|
| Check engine light stays on | Sensor fault or emission system | OBD scan, wiring, connectors |
| Loss of power or rough idle | Electrical fault, battery, or fuel system | Computer codes, charging, fuel pressure |
| Air-conditioning blows warm | Refrigerant leak or compressor fault | Cooling circuit, electrical engagement |
| Battery warning light | Alternator, battery, or wiring | Charging voltage, battery condition, terminals |
Proton specifics
Proton Saga, Persona, X50, X70, and S70 models commonly bring in battery and charging faults, air-conditioning leaks, and braking sensor codes. Diagnostic inspection separates electrical warnings from mechanical wear, which is critical on these older Sagas and Personas where fault codes can mask routine brake or suspension maintenance.
Frequently asked questions
Do I need to bring anything to the workshop for diagnostics?
Bring your keys and a note of when the symptom started and what you hear or see—for example, 'check engine light came on after rough idle this morning' or 'air-con stopped cooling last week'. This saves time and helps the inspection target the most likely fault quickly.
If diagnostics find the problem, do I have to fix it the same day?
No. You receive a written quote and can decide whether to proceed immediately or take time to think. Most Proton owners fix electrical and cooling faults the same day once parts are confirmed in stock, but you are never obligated to proceed on site.
What if the diagnostic scan shows no fault codes but the problem is still there?
Intermittent faults often do not store a code. The workshop then carries out a deeper electrical and mechanical inspection based on your description—checking wiring, connectors, fuel pressure, and cooling circuit. A second diagnostic or a specialist repair may be needed.
Is diagnostics worth doing if my check engine light just came on?
Yes, immediately. A new check engine light often signals a sensor issue or early emission system leak that can be fixed cheaply. Ignoring it risks damage to the catalytic converter, which is far more expensive. Diagnostics takes one hour and costs RM 80–120.
Does your car need an inspection?
1, Jalan Kota 1/1, Cahaya Kota Puteri, 81750 Masai, Johor