Bought a used car from a dealer: your ACL rights explained

You bought a used car from a dealer. Maybe it drove fine on the test drive and then developed a serious fault a few weeks later. Maybe the dealer told you it had a full service history and it turned out that wasn't true. Maybe the engine warning light came on before you'd even made the first repayment. Whatever happened, you're now wondering whether the law is on your side — or whether "it's a used car, what did you expect?" is actually a valid legal position.

It isn't. When you buy a used car from a licensed dealer in Australia, the Australian Consumer Law (ACL) gives you the same consumer guarantees that apply to any other goods purchase. Those guarantees don't disappear because the car is second-hand, because the dealer's warranty has expired, or because you signed a contract with a "sold as is" clause. Here's what you're actually entitled to.

Quick answer

Buying a used car from a dealer means the ACL consumer guarantees apply automatically. The most important one is section 54 of the ACL — the guarantee of acceptable quality. A used car must be of acceptable quality — meaning safe, reasonably durable, and free from defects to the standard a reasonable consumer would expect, taking into account its age, price, mileage, and any statements made about it. If it has a major failure — an engine fault, a structural defect, a safety problem — you have the right to choose a refund or replacement rather than accepting a repair. A "sold as is" clause or an expired dealer warranty does not remove this right.

What the law actually says

The ACL is Schedule 2 of the Competition and Consumer Act 2010. It applies to any goods purchased from a business in Australia for personal use up to $100,000. A used car bought from a dealer sits squarely inside that definition.

The key consumer guarantees for used car buyers are:

• Section 54 — Acceptable quality. The car must be safe, durable, free from defects, acceptable in appearance, and fit for all the purposes for which cars of that kind are commonly bought. For a used car, the standard is adjusted for age and price — a ten-year-old car with 180,000 km on the clock is not expected to perform like a new vehicle — but it still must be roadworthy, safe, and reasonably durable given what you paid and what you were told.

• Section 55 — Fitness for any disclosed purpose. If you told the dealer you needed a car capable of towing a caravan, or one that could handle regular highway driving, and they confirmed it would do that, the car must actually do it.

• Section 56 — Match the description. If the car was sold by reference to a description — for example, as having a full service history, no accident history, or genuine low kilometres — and that description proves false, section 56 may be engaged. In many cases, those same facts will also support a misleading conduct claim under section 18.

• Section 18 — Misleading or deceptive conduct. If the dealer made a false statement about the car — even without intending to deceive — that's a separate breach of the ACL. This matters because it can support a claim for compensation beyond the cost of the car.

When a guarantee is breached, your remedies come from sections 259–261 of the ACL. The remedy depends on whether the failure is major or minor. Understanding that distinction is the most important thing you can do before you contact the dealer. Read the full breakdown in our article on what "major failure" really means under the ACL.

For a major failure, you get to choose: a full refund, a replacement vehicle of similar value, or compensation for the drop in value. The dealer does not get to insist on repair. For a minor failure, the dealer can choose to repair, replace, or refund — but they must do so within a reasonable time.

When this applies (and when it doesn't)

The consumer guarantees apply when:

• You bought from a licensed motor dealer (a business), not a private individual.
• The purchase was one to which the ACL consumer guarantees apply — for example, because the car cost $100,000 or less, or because it is of a kind ordinarily acquired for personal, domestic or household use.
• The car was not acquired for re-supply or for use up or transformation in manufacturing or repair processes.
• The fault is not something you caused through misuse, neglect, or an accident after purchase.

The guarantees are adjusted but not removed for used cars. Courts and tribunals consistently hold that the acceptable quality standard accounts for the age, mileage, and price of the vehicle. A $4,000 car with 200,000 km is not expected to last as long as a $25,000 car with 60,000 km — but both must be safe and roadworthy at the time of sale.

The guarantees generally do not apply when:

• You bought from a private seller (an individual on Gumtree or Facebook Marketplace, not a business). Private sales have different rules — see our article on used car rights in a private sale for that situation.
• The defect was clearly disclosed before purchase. If the dealer showed you a pre-purchase inspection report listing a known fault and you bought it anyway, you can't later claim on that specific fault.
• You simply changed your mind about the car. Consumer guarantees cover faults and failures, not buyer's remorse.
• You caused the damage yourself after taking possession.

One thing that does not affect your rights: the dealer's own warranty expiring. The statutory consumer guarantee under the ACL is separate from any warranty the dealer offers. A dealer warranty might be 3 months or 30,000 km, but the ACL guarantee runs for as long as a reasonable person would expect a car of that age, price, and description to remain free from the relevant defect. For a significant mechanical fault, that can be considerably longer than the dealer's warranty period.

What to do today

If your used car has developed a fault and you believe a consumer guarantee has been breached, here's the process that gives you the best chance of a good outcome:

1. Get an independent inspection. Before you contact the dealer, have a licensed mechanic inspect the car and provide a written report identifying the fault, its likely cause, and whether it was likely pre-existing at the time of sale. This is your most important piece of evidence. If the dealer's mechanic caused or missed the fault, see our article on what to do if a mechanic overcharged or did poor work.

2. Gather your documents. Collect the contract of sale, any written representations the dealer made (emails, brochure, listing printout), the dealer's warranty document, your registration papers, and any service records you received. If the dealer made verbal representations, write down what was said, when, and who said it.

3. Write to the dealer. A written demand is far more effective than a phone call. State the date of purchase, describe the fault, explain why you believe it constitutes a breach of the consumer guarantee (acceptable quality, fitness for purpose, or match to description), and state clearly what remedy you're seeking — refund, replacement, or repair. Give a deadline of 14 days for a response.

4. Be specific about major vs minor. If the fault is a major failure — the car is unsafe to drive, the engine has failed, or the fault is something you would not have bought the car knowing about — say so explicitly and invoke your right under section 260 to choose your own remedy.

5. Don't keep driving an unsafe car. If the fault makes the car unsafe, stop driving it. Continuing to use a car you've identified as unsafe can complicate your claim.

Not sure how to draft the demand letter? fairgo can generate one for you in about 90 seconds, with the relevant ACL sections filled in automatically. Start your letter here.

What if the business refuses

Dealers refuse valid claims more often than they should. If your written demand is ignored or rejected, you have several escalation options:

• Your state or territory Fair Trading body. Each state has a free conciliation service that contacts the dealer on your behalf and attempts to broker a resolution. This is usually the fastest first step after a refusal. A full list of contacts is at /agencies. In many cases, a Fair Trading conciliation call is enough to get the dealer to the table.

• Your state consumer tribunal. If conciliation fails, you can file a claim at NCAT (NSW), VCAT (Victoria), QCAT (Queensland), SAT (Western Australia), SACAT (South Australia), or the equivalent in your territory. Tribunal hearings for used car disputes are common, the filing fees are modest, and you don't need a lawyer. Tribunals have heard every version of "it's a used car, what did you expect?" and they apply the ACL standard, not the dealer's preferred narrative.

• Motor vehicle industry bodies. Most states have a motor vehicle industry authority (for example, NSW Fair Trading handles dealer licensing in NSW; in Victoria, the Motor Car Traders Act sits alongside the ACL). These bodies can investigate dealer conduct separately from your consumer claim.

• ACCC. The ACCC handles systemic conduct and industry-wide issues, not individual disputes. If you believe the dealer is running a pattern of misleading conduct across many customers, you can report it to the ACCC — but for your own refund, Fair Trading and the tribunal are the right forums.

The demand letter matters here. A letter that correctly identifies the ACL sections, describes the failure accurately, and states a clear remedy signals to the dealer that you know what you're doing. Most dealers will settle rather than face a tribunal.

Common mistakes

These are the errors that most often sink an otherwise valid used car claim:

• Accepting "it's a used car" as a legal answer. It isn't. The ACL applies to used goods. The standard is adjusted for age and price, but the guarantee still exists.

• Relying only on the dealer's warranty. The dealer warranty is a contractual promise; the consumer guarantee is a statutory right. When the warranty expires, the statutory right may still apply. Don't let the dealer conflate the two.

• Continuing to drive the car without documenting the fault. If you keep driving a car with a known fault, the dealer may argue the damage worsened due to your continued use. Get the independent inspection done promptly.

• Accepting a repair when you're entitled to a refund. If the failure is major, you have the right to choose your remedy. You don't have to accept a repair offer. If you're unsure whether your failure is major, read our guide on what "major failure" really means under the ACL.

• Waiting too long. The ACL does not set a single fixed warranty period for used cars, but timing still matters. If you want to reject the vehicle, you must act within the applicable rejection period, and the longer you wait, the easier it is for the dealer to argue the fault developed after sale or that rejection is no longer available. But waiting months before raising the issue gives the dealer room to argue the fault developed after purchase. Act as soon as you identify the problem.

• Signing away your rights. Some dealers ask buyers to sign documents acknowledging the car is sold "as is" or waiving rights to future claims. Under section 64 of the ACL, a term that purports to exclude, restrict, or modify a consumer guarantee is void. You cannot be made to sign away your statutory rights, and even if you did sign such a document, it is unenforceable.

Related reading

• Bought a used car in a private sale? Here's what the ACL covers
• Mechanic overcharged or did poor work? Your ACL options
• What "major failure" really means under the ACL

This article is general information about Australian Consumer Law, not legal advice. The ACL is complex and your situation may have details that change the analysis. For advice on your specific case, see your state's Fair Trading body — full list at /agencies.