AA vs VTNZ vs mobile mechanic vs DIY: pre-purchase inspections compared

There are more ways to check a used car before you buy it than there used to be, and they are not interchangeable. An AA or VTNZ inspection puts a trained technician on the car. A mobile mechanic brings one to the seller's driveway. A guided checklist like KickTyres puts you there with a list of what that model is known for. A history report never sees the car at all. Each one answers a different question.

The short answer

• You are buying this car and it is worth real money: pay for a professional inspection. On the right car it is money well spent.
• It is an EV or hybrid: book a high-voltage battery test by name. It is not standard anywhere, and VTNZ branches cannot do it.
• You are still choosing between three or four cars: check them yourself with a checklist for that model, then pay a mechanic for the one you pick.
• You want to know about money owing, previous owners or the odometer: no inspection tells you that. That is a history check.

Each option at a glance

Prices were read from each provider's own website. Prices checked September 2026; they change without notice, so confirm the figure when you book.

AA pre-purchase inspection

• Price: $199 for AA Members, $229 for non-members. The optional EV or hybrid battery test adds $90 for non-members, $319 in total.
• Where: mobile in Auckland, Christchurch, Hamilton, Hastings, Napier, Tauranga, Whangārei and Wellington. Elsewhere, at a selected AA Auto Centre or AA testing site.
• What you get: a 100+ point visual check by an AA mechanic, a short test drive where safe and legal, and a report emailed the same day. The AA puts it at about 75 to 90 minutes.
• Not included: a compression test or a WoF.

VTNZ pre-purchase assessment

VTNZ offers two versions: a Pre-Purchase Assessment at a VTNZ branch, and a mobile Car Confidence Check run with a mobile-mechanic partner in Auckland, Hamilton, Tauranga, Wellington and Christchurch. VTNZ points out that it does not do repairs, so it has nothing to sell you afterwards.

• Price: $199 at a branch. VTNZ's own pages do not publish the mobile price; you see it when you book.
• Branch checks: engine, battery and charging, cooling, steering, suspension, tyres, bodywork, interior and lights, a drive test, and brake performance measured on a roller brake machine.
• Not covered at a branch: the high-voltage battery or motor on an EV or hybrid, which VTNZ says it cannot currently test. On most diesels and some petrol cars you get the technician's opinion of the engine rather than a physical engine test.
• Mobile extras: a fault-code scan, a compression test, a head gasket test and a hybrid battery test, each at extra cost.

Mobile mechanic

• Price: the largest national mobile booking service quotes $129 to $280, through a network of over 300 MTA-approved mechanics.
• What you get: typically the engine, cooling, charging, brakes, steering, suspension, tyres, corrosion and a road test, with a report listing likely repairs and anything that would fail a WoF.
• Watch for: what the base price includes. Whether a fault-code scan is included or extra varies between packages, even from the same service, so read the line items.

Your own garage

• Price: whatever your workshop charges. We have not surveyed workshop prices, so ask for a quote.
• The advantage: a hoist, which makes it the easiest way to get a proper look underneath.
• The catch: the seller has to let the car leave, and plenty of private sellers will not.

DIY with a guided checklist (KickTyres)

• Price: $14.90 for the guided inspection, or $24.90 with the car's full history record and AI analysis of your photos.
• What it is: you enter the plate, and it builds a checklist around the documented faults for that model, generation and engine. It runs from a five to ten minute driveway triage up to a 45 to 60 minute full walk-through.
• What it is not: a mechanic's inspection. Nobody qualified looks at the car, nothing goes on a hoist, and it cannot read fault codes or measure a battery. It tells you what to look for and what a finding typically costs to fix; you do the looking.

History report only

• Price: registration and WoF expiry dates are free from the NZ Transport Agency. A full history record from KickTyres is $13.49.
• What you get: money owing, ownership and odometer history, and a valuation, from the official records. Nothing about the condition of the car, which a report never sees. Check a plate on KickTyres to see what the report covers.

What each one checks, and what it misses

The professional prices sit close together, so the real difference is coverage. These are the things buyers most often assume are included.

Seeing underneath the car

None of the AA, VTNZ or mobile-mechanic pages we read promise a hoist on the standard inspection, and a mobile inspection on a driveway checks the underside from ground level. If rust or underbody damage is the big risk on that model, ask for a hoist, which usually means a workshop.

A road test

Every professional option includes one, but only where the car is legally roadworthy, so a car without a WoF is usually inspected without the drive. With a checklist the test drive is yours, and a guided one tells you what to feel for on that model, such as CVT shudder under a light, steady throttle on a Honda Fit.

A fault-code scan

The AA says its inspectors use specialist diagnostic tools. VTNZ's branch checklist does not list a scan, and its mobile check sells one as an extra. A checklist app cannot scan at all; the best it can do is have you watch the warning lights come on and go off at start-up. If a scan matters to you, confirm it is in the price.

The EV or hybrid battery

This is the one that changes the answer. The traction battery is expensive to replace, and a standard inspection does not measure it. The AA sells a battery test as an add-on, the mobile Car Confidence Check offers a hybrid battery test as an extra, and VTNZ branches cannot test it at all.

A KickTyres checklist has you watch how a hybrid's battery gauge behaves on a drive, or work out an EV's implied full range from the dash. That can flag a tired pack, but it cannot measure one. On a Toyota Aqua, traction battery degradation is logged in our catalogue as very common from 2011 on, at $900 to $4,500 to put right. On a Nissan Leaf or a plug-in Mitsubishi Outlander, book the battery test.

Compression and head gaskets

The AA does not include a compression test, saying modern cars usually show a warning light for compression problems. The mobile Car Confidence Check sells compression and CO2 head gasket tests as extras. On an engine documented for head gasket failure, such as the EJ-series Subaru Forester, that extra is worth asking about.

Online versus in person

A plate check and a model checklist can be done from your phone before you drive anywhere, and that is where they are strongest: ruling a car out before you spend a Saturday on it. A professional inspection needs a booking and the seller's agreement. You usually do not need to be there: the mobile Car Confidence Check says you need not attend, and the AA emails its report the same day.

When to choose each

• The AA: you are an AA Member, you want the battery test done in the same visit, or the car is in one of the AA's mobile areas.
• A VTNZ branch: the car can be driven in, you are outside the mobile areas, and you want brake performance measured on a roller brake machine. Not for an EV or hybrid battery.
• A mobile mechanic, or VTNZ's mobile check: the seller will not let the car go anywhere, or it is in another town. Pay for the extras you need, not the full menu.
• Your own garage: you want it on a hoist, and the seller will let it leave.
• DIY with KickTyres: you are still choosing, or you want to walk into the professional inspection already knowing what that model is known for.
• A history report: alongside whichever of the above you choose. It is the only one that sees money owing.

When to pay for the mechanic anyway

KickTyres is a checklist, not a qualified opinion, and it will not talk you out of a professional inspection. Book one when:

• You have decided on the car and are about to pay for it.
• It is an EV or hybrid and you have no battery health figure.
• The checklist turned up something you cannot explain, and the seller cannot either.
• It is a European car out of warranty, or has air suspension or a dual-clutch gearbox.
• You are buying from another city, or cannot get to the car yourself.

A sensible order to do it in

1. 1.Check the plate before you go. Money owing or an odometer history that does not add up rules a car out without a viewing.
2. 2.Walk the shortlist yourself with a checklist for that model, and use what you find to rank them.
3. 3.Book a professional inspection on the one you choose, with the battery test if it is an EV or hybrid.
4. 4.Take both reports into the negotiation. A documented fault with a typical repair cost is a better argument than a feeling, and the used cars to avoid guide shows what that looks like model by model.