New Zealand used car from a dealer: what rights do I have if it is faulty?
Consumer Protection NZ says the Consumer Guarantees Act applies to new and used vehicles bought from a dealer. The vehicle must be of acceptable quality, fit for purpose and match its description. Depending on the problem, the dealer may need to repair, replace or refund. Official source: Consumer Protection New Zealand. Guide: https://getinstantlaw.com/nz/used-car-problems
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