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12 Signs Your Car Needs a Service
Most people know their car should be serviced once a year, or roughly every 10–12,000 miles. But in practice, many of us stretch that out. A few extra months, maybe even longer.
The problem is, small issues can develop into larger, more expensive faults if they’re ignored for too long.
Fortunately, cars usually give us clues when something isn’t quite right. Some are obvious, like a dashboard light. Others are subtle, like a faint vibration that you only notice on smooth roads.
Spotting these early can save you time, money and hassle.
1. Dashboard Warning Lights
If a warning light comes on, it’s the car’s way of asking for attention. Some models have a dedicated 'service' light or spanner icon. Others highlight specific systems such as oil pressure, brakes or emissions.
The important point: don’t ignore them. Even if you’re not sure what the symbol means, a service can identify the underlying cause.
2. Strange Noises
Cars aren’t silent machines, but new or unusual noises are a sign that something’s changed. Squealing can point to worn brakes or a slipping belt.
Knocking might suggest suspension issues. A hissing sound could mean overheating. If noises are consistent or getting worse, it’s a good reason to have the car checked.
3. Fluid Leaks or Puddles
Some water under the car is harmless (air conditioning condensation, or a bit of exhaust moisture on a cold morning). But coloured fluids are another matter:
| Vehicle Fluid Colour | Possible Cause | What to Do |
|---|---|---|
| Brown / Black | Engine oil leak | Check oil level, arrange a service soon |
| Red | Transmission or power steering fluid | Book a service — driving may be unsafe |
| Green / Blue | Coolant / antifreeze | Risk of overheating — have it checked |
| Clear but greasy | Brake fluid | Do not drive — call a mechanic |
If you see these kinds of leaks, don’t ignore them. Brake fluid and oil in particular can make the car unsafe to drive.
4. Smoke or Unusual Emissions
Excess smoke is never normal. The colour can give a clue about what’s going on:
| Smoke Colour | Possible Cause | What to Do |
|---|---|---|
| Blue | Burning oil | Service soon — may damage engine |
| White | Coolant leak (head gasket, radiator) | Risk of overheating — get checked |
| Black | Too much fuel being burned | Service required — emissions fault |
Smoke from under the bonnet can also point to wiring issues, cooling problems or a head gasket fault. Whatever the colour, it’s a clear signal the car needs attention.
5. Loss of Power or Stalling
Engines that stall regularly, hesitate when accelerating, or just feel down on power often have an underlying issue.
It could be spark plugs, clogged filters, fuel injection, or even the exhaust system. A service helps narrow it down before it leads to more serious trouble.
6. Brakes Behaving Differently
Brakes are a safety-critical part of any vehicle. If you need to press harder on the pedal, or hear grinding or squealing, don’t wait.
It could be worn pads or low brake fluid, both of which are straightforward to fix if caught early.
7. Vibrations or Juddering
A car that vibrates on smooth roads usually has something out of place. Common causes include unbalanced wheels, worn suspension or loose engine mounts.
Even if the vibration seems minor, it’s worth investigating before it worsens.
8. Reduced Fuel Economy
If you find yourself filling up more often, something may be affecting efficiency. Underinflated tyres, a dirty air filter or problems with the fuel system can all reduce miles per gallon. A car service can identify the cause.
9. Difficulty Starting
Engines should start reliably. If yours hesitates, coughs, or feels sluggish to fire up, it might be the battery, spark plugs or starter motor.
None are unusual faults, but all are worth checking promptly.
10. Unusual Smells
Strong smells can reveal problems. Petrol odours may mean a fuel leak. Burning smells could point to overheated belts or brakes. A sweet smell inside the car sometimes indicates a coolant leak.
These are easy to dismiss at first, but they rarely disappear on their own.
11. Steering Feels Off
If the steering feels heavier than usual, pulls to one side or makes noises when turning, it could be power steering fluid, alignment or suspension.
Any change in how the car handles should be checked.
12. Overdue Mileage or Time
Even without any symptoms, cars still need regular servicing. Oil degrades, filters clog and tyres wear gradually.
Following the manufacturer’s schedule - typically once a year or after a set mileage - helps prevent avoidable problems later on.
Why It Matters
Delaying a service - be it an interim, full or major service - doesn’t just risk higher costs down the line.
It can affect safety, fuel efficiency and the overall lifespan of the vehicle. Booking a service when you notice these signs - or simply when the schedule says it’s due - keeps your car reliable and roadworthy.
Book Your Service
If you think your car may be due, it’s easy to book online with Blackcircles.com. We work with trusted local garages, offering a range of service options to keep your vehicle running smoothly.
