Credov's researched list of the 4 faults the Mazda MX-5 RF is known for (2015–2019), 3 of them serious or costly. Each one says what to look for when you check the car, so you can spot it before you buy. Not every car has these faults: they are the ones worth checking on this model.
What to look for: Feel for a sudden lurching downshift when coasting downhill or off the throttle, and ask for the gearbox software update.
Why it matters: Mazda recalled 2016-2019 automatic MX-5 because incorrect TCM programming can cause an unexpected downshift and abrupt deceleration, with a risk of losing control. It is a free reflash, so an unremedied car is an easy win to close out before sale.
Sources: 1
What to look for: Fold the roof down and look for a clear gap to the roll-hoop covers, and check for fraying or holes.
Why it matters: A worn hole in the roof fabric is a weatherproofing problem as well as a cosmetic one, and a replacement genuine top is expensive, so checking the hoop gap and the fold lines for fraying is worth doing before buying any soft-top ND.
What to look for: Fully warmed up, change through every gear slowly and quickly, including 1-2, 2-3 and a downshift to third.
Why it matters: A damaged gearbox on this model can need a full replacement, which is expensive, so a thorough, fully-warmed-up run through every gear on the test drive is the best way to catch grinding, whining or baulking before buying.
What to look for: Look underneath with a torch for an underbody cover that sags, is tied up, or has rust at its brackets.
Why it matters: Mazda told MLIT the jig controlling the bond between the under cover and its bracket was not managed properly, so the bond is weak; heavy vibration or corrosion from de-icing salt separates it, a noise develops and the bracket can fall off into the path of other traffic. Japanese cars from snow regions get de-icing salt, so an import from those prefectures is more exposed than a New Zealand car.
Sources: 1
Got a question about a Mazda MX-5 RF? Ask Credov: a noise, a warning light, a part or how to fix it.
On top of the faults above, every Credov inspection covers the basics: fuel smell, leaks or filler rust, engine oil leaks, power steering fluid leak, drive belt cracks or squeal, rust underneath: chassis and mounts, engine mounts, engine oil level and colour, coolant level, colour and leaks, head gasket failure signs, cold start: rattle, knock or smoke, rough or hunting idle, engine running hot on gauge, gearbox or diff oil leak, swapped gearbox without lvv and more.
Researched by Credov from manufacturer recalls and service bulletins, owner reports and workshop sources. Repair prices are typical ranges, not quotes. See also fault codes and repair costs.