Cars, like any machine, don't last forever. They consist of complex systems with numerous moving parts that endure daily stress, temperature extremes, and friction. 

Over time, components wear out, fluids need replenishing, and electrical parts may fail. As a result, certain car problems frequently occur, leading mechanics to perform the same repairs repeatedly.

In this blog, we'll cover the most common car repairs. The good news? Many can be avoided or delayed with proper service appointments and attention to preventive care. 

Here are the nine most common car repairs:

1. Spark plug replacements

Spark plugs are small but essential, igniting the fuel to start your engine. 

Though inexpensive and replaceable at home, proper installation is crucial. Delayed or incorrect replacement can cause serious engine and transmission damage. 

Whether you DIY or visit a service centre, ensure this common car repair is done correctly.

2. Fuel cap fit

When the "check engine" dashboard light comes on, a loose fuel cap is often to blame. 

Ignoring it can reduce gas mileage, as excess air in the tank causes fuel to burn faster, leading to more frequent fill-ups and higher long-term costs.

3. Replacing the oxygen sensor

Oxygen sensors measure exhaust oxygen levels to optimise engine performance and emissions by regulating the air-fuel ratio.

So long as the ratio of air and petrol in the chambers remains optimal, your engine will run just as it should. Replace these as and when required!

4. Ensuring brakes and pads are replaced on time 

Everyone knows brakes are important. More than a quarter of all car accidents happen because a vehicle didn't — or couldn't — stop in time to avoid a collision. 

Common brake repairs include replacing worn-out brake pads, which wear down naturally with everyday use.  

On their own and when done on schedule, the cost of replacement isn’t pricey. Regular brake maintenance can also cover brake discs, drums, lines, and rotors.

Split your car repair costs

If you're worried about car repairs, then Bumper could help by splitting the cost into interest-free monthly instalments at no cost to you.

5. Oil changes 

You need to change the oil in your car every 3,000 miles or so to keep your engine running smoothly and efficiently.

Oil collects debris over time, reducing its lubricating ability. Fortunately, oil changes are easy to learn through online or DIY courses.

Keeping accurate records of oil changes can boost your car's resale or trade-in value. Some mechanics will even put a sticker on your windscreen reminding you when the next oil change should happen.

6. Tire repairs and changes 

Without well-inflated tyres and treads appropriate for the weather, you can sacrifice control, speed, and fuel efficiency.

It's vital to get your tires patched quickly anytime you run over a sharp object like a chunk of broken glass, anytime you notice a leak, or if the tires have simply become too worn.  

Mechanics are also trained to spot tire issues, even during unrelated repairs.

7. The ignition system 

The ignition system on a car includes the starter, battery, and the ignition key or button assembly on the dashboard. 

If any of those pieces aren't working, the engine won't turn over — or you might end up with an engine failure in mid-journey. This is one of the most common repairs on cars, and one to watch out for!

8. The electrical system

In addition to the ignition and starter, key electrical components like fuses and light bulbs that need regular replacement are also connected to your battery. 

These types of repairs can easily be done at home, and the components are easy to find at shops like Halfords, which stock automotive goods.

Just do a bit of homework and be sure you have the correct specifications in fuses or bulbs.

9. Alarms installed after purchase 

Car alarms installed after the car leaves the dealer’s forecourt often cause problems. 

Alarm systems need to draw power from the car’s battery and electrical system in order to operate. As an add-on the alarm can cause other systems to receive less power than they need and fail. They can also kill the battery if installed incorrectly.   

Ensure the alarm matches your car's electrical specs, or you may face costly removal.

10. Alternator failure

The alternator charges your battery and powers the electrical system. It’s a critical component of any car and responsible for safe driving. 

Signs of failure include dim headlights, a dead battery, or a dashboard warning light. If you notice any of these, have your alternator checked and replaced if needed.

11. Overheating engine 

An overheating engine can be caused by a wide range of issues, from a malfunctioning radiator to a cooling system leak.

If you realise your engine is overheating you must pull over and turn your car off. Allow the car to cool down and then open the bonnet and check the coolant level. If low, top up the coolant. If the overheating problem continues, you must visit a mechanic.

Facing an unexpected car repair bill?

If you do find yourself facing a large repair bill for something unexpected, a car repair loan can help ease the pain.

You might also consider a ‘buy now, pay later’ service like Bumper, which lets you get the repairs you need quickly while deferring payments in easy interest-free instalments.  

Most common car repairs - The takeaway

By staying informed about common car repairs, you can make smarter decisions that save you time, money, and stress. Regular maintenance and attention to early warning signs help you prevent minor issues from becoming major problems — which is always a good thing.

Embracing these tips and working with a trusted mechanic when needed will not only extend the life of your car but also ensure a safer, smoother, and more enjoyable driving experience. 

Bookmark this page so you don’t forget these most common auto repairs!

Or keep learning on the Bumper blog now.

Author - Joseph Law

Joseph has been writing about cars for over seven years and writing for Bumper for over two, blending his passion for automobiles with a talent for storytelling.

Joseph has written about engineering and cars for Autozilla, Komaspec, and several engineering manufacturers. When he's not writing or tinkering with one of his five cars, Joseph dreams of owning an Alfa Romeo 33 Stradale.