Mechanic overcharged or fixed the wrong thing? Your ACL options

You dropped your car off for a brake pad replacement and picked it up with a bill twice what you were quoted — plus a list of extra work you never approved. Or the mechanic fixed something, you drove away, and the same warning light came back on within a week. Or they charged you for parts you're pretty sure weren't fitted. Many people assume there's nothing they can do once they've paid, or because they can't argue the technical detail.

The Australian Consumer Law (ACL) covers services as well as goods, and a car repair usually involves both. A repair is usually a mixed supply: the parts fitted are goods (they must be of acceptable quality, section 54) and the labour is a service (sections 60 to 62). The remedies differ: sections 259 to 263 for goods, and sections 267 to 269 for services. An overcharge or unauthorised work is a different problem, mainly about your contract and the price.

Quick answer

What went wrong decides what you can ask for. For poor work, the services guarantees apply, especially section 60 (due care and skill) and section 61 (fitness for a purpose or result you made known). If the failure can be fixed and isn't major, you can require the workshop to fix it within a reasonable time; if it refuses or doesn't, you can have it fixed elsewhere and recover the reasonable cost, or cancel. If it's a major failure, you can cancel and get a refund for any part of the service not yet consumed, or claim compensation for the drop in value. For a finished repair, compensation or a proper fix is usually the practical outcome. An overcharge or unauthorised work is mainly a contract and pricing issue: a price agreed before the job generally binds both sides, and under the ACL's unsolicited services rules a business can't demand payment for work you didn't authorise unless it has reasonable cause to believe it's owed, which it must prove. Start with a written complaint; if that fails, your state or territory consumer body may help, and a tribunal or court with jurisdiction can make binding orders.

What the law actually says

The services guarantees apply when a business supplies services in trade or commerce to a consumer, as defined in section 3 of the ACL (see below). A mechanic's work, whether by a sole trader, franchise or dealership, will usually be a supply in trade or commerce.

Three guarantees are most relevant to mechanic disputes:

• Section 60 — Due care and skill. The mechanic must perform the service with due care and skill: the care and skill of a reasonably competent mechanic, including taking reasonable steps to avoid loss or damage. Replacing the wrong part, leaving a bolt loose or causing new damage while doing the work is likely to be a failure to use due care and skill.
• Section 61 — Fitness for a purpose or result made known. If you made known a particular purpose, or the result you wanted (for example, "I need this car to pass a roadworthy inspection"), the service must be reasonably fit for that purpose, and of a nature and quality that might reasonably be expected to achieve that result. Neither applies if the circumstances show you didn't rely, or it was unreasonable to rely, on the mechanic's skill or judgment.
• Section 62 — Reasonable time. If no time for supply was fixed or agreed, the service must be supplied within a reasonable time. This matters if the workshop has held your car for weeks without explanation.

For guarantees other than section 60 (so including sections 61 and 62), you can't take action if the failure happened only because of someone other than the mechanic (or its agents or employees), or a cause independent of human control after the work was done (section 267(1)(c)).

Parts are goods. If a part fitted during the repair is faulty, the goods remedies apply to it. For a non-major failure that can be remedied, the business gets the first reasonable opportunity to fix it, by repair, replacement or refund, within a reasonable time; if it refuses or doesn't, you can have it fixed elsewhere and recover the reasonable cost, or reject the part (subject to section 262). For a major failure, or one that can't be remedied, you can reject the part (if the right to reject hasn't been lost under section 262) and choose a refund or a replacement of the same type and similar value if one is reasonably available (section 263), or keep it and claim compensation for the reduction in value. Under section 262, you can't reject goods that have been attached to other property and can't be detached or isolated without damaging them, so a fitted part may need a compensation claim instead.

The price and unauthorised work. No single ACL section says a business cannot charge more than it quoted. The protection comes from three directions:

• Your contract. NSW Fair Trading guidance says that if you and the repairer agree on a price before the job starts, it forms part of the contract and is generally binding on both parties. Queensland's Office of Fair Trading notes that estimates are often verbal and approximate, while quotes are more specific and itemise the work, so whether you had a quote or an estimate matters.
• Unsolicited services. Under the ACL, a business must not assert a right to payment for services you never requested unless it has reasonable cause to believe it's entitled to payment, and it bears the onus of proving that; you aren't liable to pay for unsolicited services. The ACCC's motor vehicle sales and repairs guide for industry gives a worked example: a consumer whose mechanic did extra work without asking doesn't have to pay for work beyond what he initially agreed to. That would be different if the mechanic had asked and he had agreed.
• Misleading conduct. If the quote was misleading when it was given — a figure the business never intended to honour, or one that left out charges it already knew were coming — that can engage section 18 (misleading or deceptive conduct) or section 29, which expressly covers false or misleading representations about price. An invoice that charges for parts or work you never received may raise the same issues.

State rules add to this. NSW, for example, requires motor vehicle repairers to be licensed, and its guidance says a repairer must only do work you have authorised. Consumer bodies in NSW, Victoria, Queensland, WA and SA all advise getting a quote or estimate first and authorising any extra work. The rules differ between states, so check with your state or territory consumer body.

For remedies when a services guarantee isn't met, section 267 of the ACL sets out your options. A failure is major if a reasonable consumer fully acquainted with the nature and extent of the failure wouldn't have acquired the service; the service is substantially unfit for a purpose services of that kind are commonly supplied for, unfit for a particular purpose you made known, or not of such a nature, or quality, state or condition, that it might reasonably be expected to achieve a result you made known, and can't easily and within a reasonable time be remedied; or it creates an unsafe situation (section 268). Two or more failures that aren't major on their own are together a major failure if a reasonable consumer fully acquainted with them, taken as a whole, wouldn't have acquired the service (section 268(2)).

• Major failure, or one that can't be remedied: you can cancel and get a refund for the part of the service not yet consumed (section 269), or keep the contract and claim compensation for the drop in value. For a completed repair, little or nothing may be left unconsumed, so compensation is often the more useful remedy.
• Non-major failure that can be remedied: you can require the mechanic to fix it within a reasonable time. If it refuses or doesn't, you can have it fixed elsewhere and recover the reasonable cost, or cancel (section 267(2)).
• Other loss: you can also claim damages for other reasonably foreseeable loss caused by the failure, such as towing (section 267(4)), if you can evidence it, took reasonable steps to limit it, and don't claim the same loss twice.

You can read more about how these remedies work for services generally in our services that go wrong guide.

When this applies (and when it doesn't)

The consumer guarantees for the repair are likely to apply when:

• You paid a business (not a friend doing you a favour) to work on your vehicle.
• The dispute is about the quality of the work or the parts fitted. Price and unauthorised work are mainly contract issues (see above), with the ACL's unsolicited services and misleading conduct rules alongside.

Keep evidence that you engaged the mechanic and what was agreed — a receipt, a bank statement, a tax invoice, or even a text message confirming the booking.

The guarantees are less likely to help when:

• The mechanic disclosed a risk before doing the work and you accepted it. If they warned a seized bolt might snap and you said go ahead, a snapped bolt may not be a failure to use due care and skill.
• You asked for a specific repair rather than relying on the mechanic's judgment. Queensland's Office of Fair Trading says that if you ask for a specific repair and it doesn't fix the problem, you can't hold the repairer liable — the reliance condition in section 61 points the same way. Poor workmanship on the repair you asked for is a different matter.
• The new problem is unrelated to the work done. If your alternator fails after a brake service, you'd need to show a link.
• You agreed to a "time and materials" arrangement with no cap. A high bill isn't automatically a problem, though the work must still be done with due care and skill.
• You didn't acquire the repair as a consumer. Under section 3 of the ACL, you acquire services as a consumer if the amount paid or payable for them was $100,000 or less, or they are of a kind ordinarily acquired for personal, domestic or household use. Either limb is enough, and it's the price of the repair that counts, not the vehicle. Car servicing is usually of that kind even if you use the car for work, and services have no section 3 exclusions. Check how section 3 applies to you.

These rights sit alongside your contract. If the mechanic gave you a written quote and then charged more without your approval, you may have a contract claim, and an ACL claim too if the quote was misleading when given (sections 18 and 29) or the extra work was unsolicited.

What to do today

1. Gather everything you have. The quote, the final invoice, all messages with the workshop, and any before-and-after photos. With no written quote, note from memory what was discussed and when. Ask for an itemised account if you weren't given one, and ask to see any old parts that were replaced.
2. Check your payment options early. If you paid by card, ask your card issuer now whether a chargeback is available; if you used buy now pay later, ask the provider about its dispute process; both follow the card scheme's or provider's own time limits, not the ACL's.
3. Get an independent assessment if the work was poor. A written assessment from another qualified mechanic, covering what caused the problem and what a proper fix costs, carries far more weight than your own view because it comes from someone with the expertise and no stake in the dispute. Keep the receipt: you may be able to claim it as reasonably foreseeable loss (section 267(4)), if you can evidence it and kept the cost reasonable.
4. Write a formal complaint to the workshop. Email creates a paper trail. Describe what was agreed, what was done, and how that falls short. Reference section 60 (due care and skill) for poor work, or the quote and the lack of authorisation for an overcharge. State clearly what you want — a refund of the overcharge, a free fix of the faulty work, or compensation — and give a deadline, such as 14 days (a practical default, not an ACL requirement).
5. Be specific about the amount. "I was quoted $420 and charged $870 without authorisation. I'm seeking a refund of the $450 difference" beats a general complaint that the bill was too high.
6. Know where you stand on the car. A repairer may be able to keep the car until the bill is paid (often called a repairer's or mechanic's lien); check with your state consumer body. NSW guidance says paying despite a disagreement doesn't stop you lodging a dispute with NSW Fair Trading, so paying and recording in writing that you dispute the amount may be an option to get your car back.

Not sure how to word the complaint letter? fairgo can draft one for you — the wizard identifies the relevant ACL sections and produces a letter you send under your own name.

What if the business refuses

If the workshop ignores your complaint or says the charge stands:

• Your state or territory consumer protection body. It may help, for example by contacting the business or conciliating, if your complaint meets its criteria. Most expect you to have tried to resolve the matter with the business first, and eligibility rules vary by state and dispute type (in the ACT, for example, statutory conciliation applies only where the remedy you seek is worth $5,000 or less). These bodies don't make binding orders in ordinary consumer disputes and can't make the business settle. In NSW, Fair Trading says it offers a free dispute resolution service for problems with licensed motor dealers and repairers, but its officers can't order anyone to pay money or return a vehicle. Contact details are at /agencies.
• A tribunal or court with jurisdiction. In NSW, Victoria, Queensland, the ACT and the NT, a tribunal (NCAT, VCAT, QCAT, ACAT or NTCAT) hears many consumer claims within its limits; in Western Australia, South Australia and Tasmania, ordinary consumer claims go to the Magistrates Court. Jurisdiction depends on each forum's enabling legislation, the type of claim and the amount, so confirm the forum and its current thresholds on the official site before filing. You can usually run a claim without a lawyer, though some forums restrict legal representation (QCAT, for example, requires permission). Check current filing fees on the official site, and ask about fee exemptions, waivers or deferrals if cost is a concern. Our guide to choosing the right tribunal or court has more.

The demand letter is often enough. A clear letter citing the ACL often prompts a response, because it shows you know your rights. See what to do when a business refuses for the full escalation playbook.

Common mistakes

• Paying without recording your objection. If you're presented with an invoice that's much higher than the quote, ask for an itemised breakdown before paying and put your objection in writing. If you pay to get the car back, say in writing that you're paying under protest and still dispute the amount.
• Only complaining by phone. Follow up any call with an email summarising what was said: "As discussed this morning, I'm disputing the $450 overcharge because no authorisation was sought before the additional work was done."
• Assuming you must prove fault beyond the guarantee. You need to show the work wasn't done with due care and skill — the standard of a reasonably competent mechanic. An independent mechanic's report is the usual way to show that.
• Waiting too long. The ACL doesn't set a single fixed deadline for service complaints, but limitation laws and forum rules (for example time limits for lodging a claim) still apply, and delay makes it harder to show the problem came from the mechanic's work rather than something that happened later.
• Accepting a partial fix that doesn't address the real problem. A second inspection doesn't remedy an overcharge for work that wasn't done. Be clear about the remedy you want.
• Going to the ACCC for an individual dispute. The ACCC doesn't resolve individual complaints. Use your state or territory consumer body, then a tribunal or court with jurisdiction.

The ACL shifts the focus from "was this repair technically necessary" to "was the service performed with due care and skill, and did the business charge what was agreed for work you authorised" — questions a tribunal or court can answer without a mechanical engineering degree.

Related reading

• Services that go wrong — your ACL rights explained
• Business refused your refund? Here's what to do next
• NCAT, VCAT, QCAT — which tribunal handles your dispute?
• Section 60 of the ACL: due care and skill
• Mechanic made it worse: when a repairer causes more damage

This article is general information about Australian Consumer Law, not legal advice. It also touches on complaint and escalation pathways (state and territory consumer bodies, tribunals and courts, the ACCC), state motor repairer licensing laws, repairers' liens, card chargeback rules and contract law, whose scope, rules, thresholds and processes sit outside the ACL or can change. Confirm the current position with the relevant body before lodging. For advice on your specific case, see your state or territory consumer body — full list at /agencies.