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Car electrical repairs
Electrical faults are among the most common reasons a car won’t start, and the cause isn’t always the obvious one. Three parts get the blame most often, and the symptoms tell you which one it is.
| Part | Typical signs |
|---|---|
| Battery | Slow cranking on cold mornings, clicking when you turn the key, dim lights at start-up. Most batteries last several years, less in heat or with lots of short trips. |
| Alternator | Battery warning light while driving, lights that dim and brighten, a whining noise, a battery that keeps going flat even after it has been replaced. |
| Starter motor | A single click or nothing at all when you try to start, while the lights and radio work normally. |
Car alternator repair usually means fitting a new or reconditioned unit rather than fixing the old one. If the alternator has failed, have the battery tested too, because a dead alternator often leaves the battery damaged.
Auto electricians
If you’re searching for “car electrical repair near me” and the problem isn’t simply the battery, look for an auto electrician. They diagnose wiring faults, warning lights, central locking, lighting, alarms and batteries that go flat overnight. Most start with a diagnostic scan to read the fault codes stored by the car’s computers, then trace the fault from there.
Keys and remotes
If the remote stops working, try a new battery first: it is cheap and usually a two-minute job. A cracked case or worn buttons can often be fixed with car remote repair rather than a new key. Replacement keys and alarm remotes need to be cut and programmed to the car, which an auto locksmith or a dealer can do.
Brake repairs
Brakes wear gradually, so problems tend to creep up. Have them checked if you notice any of these:
- Squealing when braking, often the wear indicator telling you the pads are low
- Grinding, which can mean the pads are worn through to metal. Stop driving and get it looked at
- Vibration through the pedal or steering wheel, often from uneven discs
- Pulling to one side, a sign of a sticking caliper or uneven wear
- A soft or sinking pedal, which can mean air or a leak in the system. Don’t drive the car
Most brake jobs involve replacing pads, and sometimes the discs (rotors) they press on. Brake fluid also needs replacing every couple of years, because it absorbs moisture and becomes less effective.
Suspension repairs
Worn suspension makes a car less stable, wears out tyres faster and can fail a WOF. Common signs are clunks or knocks over bumps, a car that keeps bouncing after a dip, the nose diving under braking, uneven tyre wear and oil on the outside of a shock absorber.
Car suspension repair can mean replacing shock absorbers or struts (normally in pairs), springs, rubber bushes, ball joints or sway bar links. Most suspension work should be followed by a wheel alignment so the tyres don’t wear unevenly.
Transmission, engine and cooling
Transmission
Warning signs include the gearbox slipping, harsh or delayed gear changes, a burning smell and red fluid under the car. Many Japanese cars in New Zealand use a CVT (continuously variable transmission), which needs the correct fluid and regular fluid changes. Car transmission repair ranges from a fluid service to a full rebuild, so start with a diagnosis rather than accepting a replacement straight away. With a manual gearbox, a clutch that slips or bites very high is usually worn.
Oil leaks
Drips under the car, a burning smell after a drive or an oil level that keeps dropping all point to a leak. Common sources are the rocker cover gasket, the sump plug and gasket, the oil filter and the crankshaft seals. The cost of the fix depends far more on where the leak is than on the part itself, because some seals take hours to reach.
Radiator and cooling
A coolant leak, a sweet smell, a rising temperature gauge or steam from the bonnet means the cooling system needs attention. The cause might be a radiator, a hose, the water pump or the thermostat. If the engine overheats, stop as soon as it is safe. Driving on can damage the engine badly.
Axles and CV joints
A clicking noise when turning sharply usually comes from a worn CV joint on a front driveshaft. A torn rubber boot lets dirt in and grease out, and replacing the boot early is much cheaper than replacing the joint later.
Tyre puncture and rim repair
Car tyre repair is cheap when it’s possible. A small puncture in the main tread of the tyre can usually be repaired. Damage to the sidewall or the shoulder of the tyre can’t, and neither can a tyre that has been driven flat, because the sidewall breaks down inside. Some run-flat tyres also can’t be repaired, depending on the maker.
In New Zealand, tyres must have at least 1.5 mm of tread in the main grooves all the way round, and less than that fails a WOF. Grip in the wet drops off well before that, so many drivers replace tyres at around 3 mm.
A proper car tyre puncture repair is done from the inside: the tyre is taken off the rim, checked for hidden damage and sealed with a combined plug and patch. A plug pushed in from the outside is only a temporary fix.
How to fix a puncture on a car tyre at the roadside
- Get somewhere safe. Pull well off the road on firm, level ground and turn on your hazard lights.
- Loosen the wheel nuts slightly while the wheel is still on the ground.
- Jack the car at the jacking point shown in the handbook, never under the bumper or sill trim.
- Swap the wheel, then tighten the nuts in a star pattern and again once the car is back on the ground.
- Check the spare. Space-saver spares have a lower speed limit, printed on the wheel or tyre.
If the car has an inflation kit instead of a spare, follow the instructions on the kit. The sealant gets you to a tyre shop, but tell them it has been used.
Rims
Car rim repair can fix kerb damage and scuffs on alloy wheels, and a slightly bent rim can often be straightened. A cracked rim should be replaced. Hitting a kerb or pothole hard can also knock the wheel alignment out, so have it checked if the steering wheel is off centre.
Typical mechanical repair costs
| Job | Typical cost (NZ$) |
|---|---|
| Diagnostic scan | $70–$180 |
| Car battery, fitted | $200–$450 (stop-start up to about $560) |
| Alternator replacement | $450–$1,100 |
| Starter motor replacement | $400–$1,000 |
| Brake pads, per axle | $220–$480 |
| Brake pads and discs, per axle | $350–$900 |
| Brake fluid change | $90–$200 |
| Shock absorbers or struts, pair | $400–$900 |
| Wheel alignment | $80–$150 front, $150–$250 four-wheel |
| Tyre puncture repair | $45–$120 |
| Alloy rim repair, per wheel | $200–$350 |
| Transmission fluid service | $250–$500 |
| Clutch replacement | $1,200–$2,800 |
| Radiator replacement | $450–$1,000 |
| Rocker cover gasket | $250–$600 |
| Replacement key, cut and programmed | $120–$500 |
Labour is a big part of most mechanical repairs, so the same part can cost very different amounts to replace on different cars. Ask for the labour hours on the quote so you can compare like with like.
Frequently asked questions
How much does suspension repair cost in NZ?
Replacing a pair of shock absorbers or struts typically costs $400–$900 fitted, depending on the car. Smaller jobs such as sway bar links or bushes cost less, and most suspension work should be followed by a wheel alignment ($80–$250).
How much does it cost to fix car brakes?
New brake pads typically cost $220–$480 per axle fitted. Pads and discs together cost more, around $350–$900 per axle, and a brake fluid change costs $90–$200.
How much does transmission repair cost?
A transmission fluid service typically costs $250–$500. Repairs vary widely: a sensor or solenoid can be a few hundred dollars, while a rebuilt or replacement automatic gearbox can cost several thousand. Get a proper diagnosis before agreeing to a replacement.
How much does it cost to fix an oil leak?
It depends on where the oil is coming from. A leaking sump plug washer or oil filter seal is a cheap fix, a rocker cover gasket typically costs $250–$600, and leaks from seals deep inside the engine or between the engine and gearbox can cost much more because of the labour involved.
How much does radiator repair cost?
Radiators are usually replaced rather than repaired. A replacement typically costs $450–$1,000 fitted, including fresh coolant. Leaking hoses or a faulty radiator cap are much cheaper, so have the cooling system pressure-tested first.
How do I fix a puncture on a car tyre?
At the roadside, fit the spare wheel or use the car’s tyre inflation kit, following the steps in the tyre section above. Then have the tyre checked by a tyre shop: a small hole in the main tread can usually be repaired properly from the inside, but damage to the sidewall or a tyre that has been driven flat means a new tyre.
Updated 16 October 2026