Is Your Car Still Worth Fixing? What to Do When Repairs Start Costing Too Much

March 10, 2026
12:11 pm

Written by Jay: I’ve spent 10+ years buying and removing vehicles NZ-wide, andd these days I’m based out of our Frankton yard with Car Wrecker Hamilton, covering Hamilton first, then Tauranga, Rotorua, and New Plymouth (plus the wider Waikato, Bay of Plenty, and Taranaki regions).

When a repair bill starts getting close to what the vehicle itself is worth, it is worth stopping and doing the maths before approving the work.

A $700 repair on a reliable $8,000 car may be easy to justify. A $5,000 engine job on a car worth around $6,000 is a very different decision, especially if it also has rust, an expired WoF, high kilometres or other repairs coming up. The question is not simply, “Can this be fixed?” Most vehicles can. The better question is, “Does fixing it still make sense?”

The question is not simply, “Can this be fixed?” Most vehicles can. The better question is, “Does fixing it still make sense?”

Why can car repairs become uneconomical so quickly?

Parts, labour and paintwork add up faster than many owners expect. Current New Zealand repair guides give an idea of the numbers involved:

Repair	NZ cost guide
Minor dent or scratch work	Around $300 – $800
Head gasket repair	Around $5,900 average
Major transmission repair	Around $9,600 average
Engine replacement	Roughly $4,500 – $10,000

These are only guides, the actual price depends on the vehicle, parts availability and the work required.

But they show the problem clearly. If an older car is worth $5,000 – $8,000, one major mechanical failure can cost almost as much as replacing the vehicle with another used one.

Even cosmetic damage can become difficult to justify. A few dents, scratches and damaged panels might individually seem minor, but repairing all of them properly can quickly run into thousands.

Sources: AA New Zealand repair-cost guidance, MyAutoShop NZ and NZ panel-repair pricing guides.

When is fixing the vehicle still worth considering?

Do not look at the repair bill by itself. Look at what you will have after spending the money. A repair may still stack up when:

The maths becomes harder when a major repair is only one problem on a growing list.

For example, spending $3,000 on an otherwise tidy vehicle may be reasonable. Spending $5,000 when it also needs tyres, suspension work, rust repairs and another WoF soon may not be.

Ask the workshop what else they can see coming up, not just what needs fixing today.

What are your options if the vehicle is old, damaged, rusty or not running?

There is no single right answer. What makes sense depends on the condition of the vehicle and how much time and money you want to put into it. Your main options are:

Repair and keep it

Best suited to a vehicle that is fundamentally sound and still useful to you.

Use insurance where applicable

If the damage came from an insured event, check with your insurer before approving repairs or making other arrangements.

Sell it privately in its current condition

This can suit vehicles that still have reasonable market interest. Be clear about known faults and the vehicle’s condition.

Ask about a trade-in

Some dealers may consider vehicles with faults, although what they will accept varies considerably.

Get an as-is assessment from a specialist vehicle business

This can be useful when you do not want to fund the repairs first. Check out our specialist car buyers here.

Dispose of an end-of-life vehicle appropriately

If severe rust, structural damage, fire damage or major mechanical failure has effectively finished the vehicle’s useful road life, responsible disposal may be the practical option.

What if the WoF or rego is no longer current?

A WoF confirms that the vehicle met required safety standards at the time of inspection. Vehicle licensing, commonly called rego, is the fee paid to use a registered vehicle on the road. Registration itself is a separate thing.

NZTA says that when a light vehicle changes hands, it would normally need a WoF issued less than one month earlier unless the buyer and seller agree otherwise. If it has no current WoF, that arrangement should be made clear and put in writing.

Both parties also need to notify NZTA when a vehicle changes hands. If the vehicle is no longer roadworthy and is being permanently taken off the road, different deregistration requirements may apply.

Do not assume an expired WoF, expired licence or cancelled registration are all the same thing.

What should you know before deciding what to do?

You do not need a perfect diagnosis, but having a few facts makes the decision much easier. Start with:

Photos can also help when asking someone else to assess the condition. The aim is to compare the real vehicle you have today against the total cost of getting it back to the condition you need.

How do you decide whether to repair it or move on?

A simple comparison usually gives you the answer.

Situation	What is worth considering
Small repair, otherwise reliable vehicle	Repairing it may make sense
One major fault but strong overall condition	Compare repair cost with replacement cost
Repair cost approaching the vehicle’s value	Get another quote and compare your alternatives
Multiple mechanical faults plus high kilometres	Consider whether further spending is worthwhile
Serious structural rust or accident damage	Get professional advice before putting more money into it
Vehicle no longer runs and has several existing issues	Look at alternatives before authorising a major repair

There is no magic percentage where a vehicle suddenly becomes “not worth fixing”.

The useful question is whether the money you are about to spend leaves you with a vehicle that is safe, reliable and worth keeping or simply puts more money into a car that may need another expensive repair next.