That small glowing symbol on your dashboard is your car trying to tell you something. Knowing whether to pull over immediately or simply book a workshop visit next week could save your engine, your brakes, or your life.
The Colour System: Red vs Amber vs Green
Dashboard warning lights use a traffic-light logic. Once you understand it, the stress of seeing a light come on drops significantly.
- Red: Stop or act immediately. Something critical is wrong. Continuing to drive risks serious damage or safety failure.
- Amber / Orange: Address it soon, within days at most. The car is still drivable in most cases, but ignoring it will turn a minor fix into an expensive one.
- Blue / Green: Informational. You are now in high-beam, a turn signal is on, cruise control is active. No action needed.
The rule of thumb: if it is red and you are moving, find a safe place to stop. If it is amber, do not leave it for weeks while hoping it goes away on its own.
The One Thing Most Drivers Get Wrong
The most common mistake Singapore drivers make is ignoring amber lights because the car feels normal. The engine sounds fine, the brakes feel fine, the steering feels fine. So they drive on for weeks or months.
Here is the problem. Many amber warnings are triggered before the underlying issue becomes physically noticeable. Your engine management system detects a fault in a sensor, valve, or emissions component long before it affects driveability. By the time you notice something wrong, the problem has often escalated from a $100 sensor replacement into a $1,500 repair.
Amber means address soon. It does not mean ignore indefinitely.
The 12 Warning Lights Every Singapore Driver Should Know
1. Check Engine (CEL)
Urgency: Amber (red if flashing)
The check engine light covers a wide range of faults detected by your car’s onboard diagnostics (OBD). It could be something as minor as a loose fuel cap or as significant as a failing catalytic converter or oxygen sensor. If it is glowing steadily, it is amber urgency. If it is flashing, treat it as red: a flashing CEL typically means the engine is misfiring in a way that can damage the catalytic converter rapidly.
What to do: A steady CEL means book in for a diagnostic scan within the week. Do not top up petrol at a petrol station and assume it will clear. The fault code needs to be read. A flashing CEL means stop driving, call for a tow or drive very gently to the nearest workshop immediately. At The Right Workshop, we can pull the fault codes and walk you through exactly what the OBD is telling us.
2. Oil Pressure Warning
Urgency: Red. Stop immediately.
This is one of the most serious lights on any dashboard. It means your engine is not getting adequate oil pressure. Without sufficient oil circulation, metal components in the engine are grinding against each other with no lubrication. Continued driving can destroy an engine in minutes. This is not a light to note and deal with later.
What to do: Pull over safely and switch off the engine as soon as it is safe to do so. Check the oil level with the dipstick once the engine is off and cooled slightly. If the level is critically low, do not restart. Call a mechanic or tow service. Do not assume adding oil will be sufficient if the light came on while driving at normal levels, as you may have an oil leak or a failing oil pump.
3. Battery / Charging System Warning
Urgency: Red
This light indicates the battery is not being charged properly. The most common causes are a failing alternator, a loose or corroded battery terminal, or a worn drive belt. In Singapore’s heat and humidity, battery and charging system issues are common, particularly on cars over three years old.
What to do: You may have limited driving range before the battery drains completely and the car stalls. Reduce electrical load by switching off air-conditioning, headlights if safe, and other non-essential electronics. Head to a workshop directly. Do not park and leave it overnight assuming it will start again in the morning. If the car does stall, you will need a jump start and a charging system inspection.
TRW handles battery replacements and alternator checks as part of our battery service.
4. Tyre Pressure / TPMS Warning
Urgency: Amber
The Tyre Pressure Monitoring System (TPMS) triggers when one or more tyres drops below a safe pressure threshold. In Singapore’s climate, tyre pressure fluctuates more than many drivers realise. On a hot day, pressure naturally rises slightly. After a cold night, it drops. If the TPMS light comes on, you have a tyre that is meaningfully underinflated.
What to do: Check all four tyres at the nearest petrol station with an air pump. The correct pressure for your car is on the sticker inside the driver’s door jamb, not the maximum figure printed on the tyre sidewall. If one tyre is significantly lower than the others, inspect it for a nail or damage. If the light stays on after inflating all tyres, the TPMS sensor itself may need resetting or replacement. Persistent underinflation on the PIE or CTE at speed is a blowout risk.
5. Engine Temperature / Overheating Warning
Urgency: Red. Stop as soon as safely possible.
Your engine has reached a critically high temperature. Common causes include low coolant, a failed thermostat, a blocked radiator, or a failing water pump. Singapore’s stop-start traffic, particularly on the CTE or PIE during the evening peak, puts constant thermal stress on cooling systems.
What to do: Switch off the air-conditioning immediately to reduce engine load. If the temperature gauge is in the red and the warning light is on, pull over safely and switch off the engine. Do not open the radiator cap while the engine is hot. Do not add cold water to a hot radiator. Let the engine cool completely, then check the coolant reservoir level. If it is empty or the engine overheats again after refilling, tow it to a workshop. Continuing to drive an overheating engine can warp the cylinder head, which is a very expensive repair.
6. ABS Warning Light
Urgency: Amber
The Anti-lock Braking System (ABS) warning means the ABS module has detected a fault. Your standard brakes will still work, but in an emergency stop the wheels may lock up, reducing your ability to steer around an obstacle. This matters on Singapore roads, especially in the wet.
What to do: Your braking is degraded in emergency scenarios. Drive with more following distance and avoid situations requiring hard stops. Book in for an ABS diagnostic soon. Common culprits are a faulty wheel speed sensor, which is relatively inexpensive to replace, or a failing ABS control module, which costs more.
7. Airbag / SRS Warning Light
Urgency: Amber
SRS stands for Supplemental Restraint System. When this light is on, there is a fault in the airbag system. The airbags may not deploy in a collision, or in rare cases, may deploy unexpectedly. Neither outcome is acceptable.
What to do: Do not ignore this light. The car is drivable, but you are effectively unprotected by passive safety systems. This requires a diagnostic scan to read the specific SRS fault code. Do not attempt to reset it by disconnecting the battery as that will not fix the underlying fault and can trigger accidental deployment during repair.
8. Traction Control / Stability Control
Urgency: Amber (if on continuously)
If this light flashes briefly while you are driving, that is normal. It means the system is actively intervening to prevent wheelspin or loss of control. This happens when accelerating on a wet road or taking a corner aggressively. If the light stays on continuously, the system has been disabled or has developed a fault.
What to do: A flashing light during wet conditions on the PIE or AYE is the system working as intended. A permanently on light means book in for a diagnostic. Traction control faults often share wheel speed sensor hardware with ABS faults, so both may appear together.
9. Power Steering Warning
Urgency: Amber to Red depending on severity
Modern cars in Singapore largely use Electric Power Steering (EPS). When this light comes on, the power assistance may be reduced or lost entirely. The steering will feel dramatically heavier, particularly at low speeds and in carparks.
What to do: If the steering suddenly becomes very heavy while moving at speed, reduce speed carefully before attempting any turns. Low-speed manoeuvring such as parallel parking in an HDB carpark becomes much harder. Do not attempt to park in a tight space if assistance is fully gone. Drive carefully to a workshop for a diagnostic. Power steering faults can range from a software reset to a full EPS motor replacement.
10. Fuel Level Low Warning
Urgency: Amber
You are running low on fuel. Most cars have 5 to 10 litres remaining when this light comes on, giving you roughly 60 to 100 km of range. However, repeatedly running the tank very low is hard on your fuel pump. The pump uses fuel as coolant, and running on fumes forces it to work hot.
What to do: Fill up. Do not play the range game repeatedly. If you are caught in traffic on the CTE during peak hour with this light on, note the distance to the nearest petrol station before your navigation system tells you the wrong exit to take.
11. Brake System Warning
Urgency: Red
This light has two common triggers. First, your handbrake is engaged. Check that it is fully released. Second, if the handbrake is not engaged, it indicates low brake fluid or a fault in the braking system. Brakes are non-negotiable.
What to do: If the handbrake is released and the light is still on, do not drive normally. Test your brakes gently at low speed in a safe area. If the pedal feels soft, spongy, or travels further than usual, you likely have a brake fluid leak. Do not continue driving. Call a tow. If the pedal feels normal, drive directly to a workshop and do not make any unnecessary stops or accelerations that require heavy braking on the way. Low brake fluid may indicate worn pads or a leak in the hydraulic circuit.
12. Service Due / Spanner Icon
Urgency: Amber
This is your car’s maintenance reminder. It usually means you are approaching or have passed the mileage or time interval for a scheduled service, typically an oil change. It is set by your car’s computer and does not mean something has broken. Yet.
What to do: Book a service within the next 500 to 1,000 km or within two to three weeks. Delaying engine oil changes in Singapore’s heat degrades oil quality faster than in cooler climates. Old oil loses its viscosity and lubricating properties, increasing engine wear. Most cars here run on 5,000 to 10,000 km oil change intervals depending on the oil type used.
TRW’s regular servicing packages cover oil changes, filter replacements, and a multi-point inspection so that multiple issues are caught in one visit.
When Multiple Lights Come On Together
If several warning lights illuminate at once, especially after a battery change, jump start, or a sensor replacement, this can sometimes be a calibration or reset issue rather than multiple simultaneous failures. However, do not assume that. Multiple lights on the same drive, particularly combinations like ABS plus traction control plus brake warning, often share a root cause such as a faulty wheel speed sensor. A diagnostic scan will tell you whether you have one underlying problem or several.
Singapore-Specific Notes
A few things that matter more here than in other countries:
- Heat: Singapore’s climate accelerates battery degradation, coolant evaporation, and rubber seal wear. Warning lights related to these systems appear more frequently here than in temperate climates.
- Stop-start traffic: The CTE, PIE, and Bukit Timah Road during peak hours put sustained thermal and mechanical stress on cooling systems, brakes, and transmission. Overheating warnings are more common during prolonged idling than during highway driving.
- LTA inspections: A car with active warning lights, particularly ABS, SRS, or brake warnings, will fail its LTA inspection. Do not leave known faults unaddressed before your inspection date.
- COE cars: Older vehicles on renewed COEs often have multiple amber lights on simultaneously. If your car is 10 or more years old, the cost to clear all faults should be weighed against the car’s remaining value and your renewal decision.
A Warning Light Is On and You Are Not Sure What to Do
If any warning light has come on and you are unsure how serious it is, WhatsApp us before you drive further. We will tell you honestly whether it is safe to drive to Kaki Bukit or whether you need to tow. We would rather help you make the right call than have you damage the engine getting here.
WhatsApp The Right Workshop: +65 9855 8423
We are at Kaki Bukit, open Monday to Friday 9am to 6:30pm and Saturday 9am to 1pm.
