Car Dashboard Warning Lights Australia
That little orange or red symbol glowing on your dashboard can mean anything from "check your fuel cap" to "stop the engine now." Here's a plain-English guide to the warning lights Australian drivers see most — and exactly what to do when each one appears.
The three colours, in order of urgency
Every dashboard light falls into one of three colours. The colour tells you how fast you need to act:
- Red = stop. A serious fault that can damage the car or be unsafe. Pull over safely, turn the engine off, and investigate.
- Amber/yellow = caution. A warning, not an emergency. You can usually keep driving, but book a check within a few days.
- Green/blue = information. A system is simply on — headlights, cruise control, high beam. No action needed.
Red lights: stop as soon as it's safe
These are the symbols you never ignore:
- Oil pressure (oil can). Not the same as low oil level — it means pressure is low. Stop the engine immediately; driving on can seize it within minutes. Check the level once cool; if it's full but the light stays, call a mechanic.
- Brake system / park brake. If the park brake is off and this stays lit, you may have low brake fluid or a brake fault. Get it checked before driving further.
- Engine temperature (thermometer). The car is overheating. Pull over, switch off, and let it cool. Driving hot warps the head and cracks the engine.
- Battery/charging (rectangle with +/−). The alternator isn't charging. The car runs on battery alone and will stall. Limit electrical load and head to a mechanic.
- Airbag (person with a ball). The airbag system has a fault and may not deploy in a crash. Book a diagnostic soon.
- Power steering. Steering may become very heavy. Safe to crawl to a mechanic but not a long motorway trip.
Amber lights: book a check soon
- Check engine (engine outline or "CHECK"). The engine computer detected a fault — anything from a loose fuel cap to a misfire. A steady light means book a diagnostic. A flashing light means stop and call a mechanic; the engine may be damaged.
- Tyre pressure (horseshoe with "!" — TPMS). One or more tyres is low. Inflate to the placard pressure; the light usually clears after a short drive.
- ABS. The anti-lock braking system is disabled, but normal brakes still work. Have it scanned — wet roads will be more dangerous without ABS.
- DPF (diesel particulate filter). Common on modern diesel utes and SUVs. A longer highway run often clears it; repeated short trips will keep triggering it.
- AdBlue (diesel). The exhaust fluid is low. Top it up or the car may refuse to start once empty.
Green and blue: just information
- Headlights / high beam (blue). Self-explanatory.
- Cruise control / lane assist. The system is active.
- Eco mode. The car is in fuel-saving mode.
What to do when a warning light appears
- Note the colour. Red = stop soon; amber = check soon; green = ignore.
- Check the obvious. Loose fuel cap triggers the check engine light; low tyre triggers TPMS. A 30-second check fixes many false alarms.
- Listen and feel. Strange noises, loss of power, or a heavy pedal mean stop now.
- Get a diagnostic. Any mechanic (or an OBD2 scanner) reads the fault codes that explain the light. That's the fastest way to know if it's serious.
Know your car's codes before the workshop does
Most warning lights come from a fault code stored in the engine computer. A cheap OBD2 scanner — or AutoBrain's OBD2 integration — reads those codes in plain language on your phone, so you walk into the workshop knowing whether it's a $20 sensor or a $2,000 job. AutoBrain translates the code, explains what it likely means for an Australian car, and logs it against your vehicle's service history so the next owner (or your mechanic) sees the full picture.
Frequently asked questions
What should I do if a red warning light comes on while driving?
A red warning light means stop as soon as it's safe. Pull over, turn the engine off, and check the cause. Red lights cover serious faults like low oil pressure, overheating, or a brake system failure — driving on can cause expensive or dangerous damage.
Can I keep driving with an amber warning light on?
Usually yes, but get it checked soon. Amber lights are warnings, not stop-now orders — for example the check engine light or tyre pressure light. Have the fault diagnosed within a few days so it doesn't become a breakdown.
What does the engine warning light mean?
The check engine light means the engine management system has detected a fault — anything from a loose fuel cap to a misfire. A steady light means book a diagnostic; a flashing light means stop and call a mechanic, as the engine may be damaged.
Why is my battery warning light on after starting?
If the battery/charging light stays on after start, the alternator isn't charging the battery. Your car is running on battery alone and will eventually stall. Limit electrical load and get to a mechanic or you may need a jump start.
What does the low oil pressure light mean?
The oil can symbol in red means oil pressure is low — not just low level. Stop the engine immediately. Driving with low oil pressure can seize the engine within minutes. Check the oil level once cooled; if it's full but the light stays, call a mechanic.
How do I reset a tyre pressure warning light?
Inflate all tyres (including the spare) to the pressure on the driver's door placard, then the TPMS light usually clears itself after a short drive. If it stays on, a sensor may be flat or faulty — have it scanned.
Next time a light comes on, know what it means before the workshop tells you. Try the live demo or see hosted plans — the free tier includes OBD2 diagnostics for one vehicle.