Credov's researched list of the 7 faults the Mazda CX-7 is known for (2006–2012), 6 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: Look behind each front wheel with a torch for split ball joint boots and rust staining, and ask for the recall record.
Why it matters: Water entering the fitting can corrode the joint until it separates from the control arm, which is a loss of steering control. Mazda's remedy was to replace both front lower control arms, so a car with the original arms still fitted has not had the campaign done.
Sources: 1
What to look for: Check the plate on the NZTA recall check, watch the passenger airbag light, and ask for proof the inflator was replaced.
Why it matters: NZTA's entry-inspection bulletin says vehicles flagged with an open airbag recall must be rejected at entry inspection unless irrefutable evidence is provided from the manufacturer that the affected airbags were replaced, and that from 31 May 2018 alpha inflators are prohibited imports and prohibited for sale in trade.
What to look for: Listen at a stone-cold start for ticking in the first seconds, then for a rattle at the engine front once warm.
Why it matters: Mazda extended warranty coverage for exactly these two noises on the L3T because the VVT rotor lock-pin hole wears or the VVT case breaks, and the timing chain stretches. That coverage window (7 years from the original warranty start date, or 70,000 miles) has closed on every car now in the NZ used market, so any car that still makes the noise is a chain and actuator job at the buyer's cost.
Sources: 1
What to look for: Pull the dipstick: sludgy, gritty or strong-smelling oil points to carbon blocking the oil pick-up.
Why it matters: Once carbon blocks the oil pick-up the engine runs with no oil pressure and is usually destroyed, even on a well-serviced car, turning a cheap injector-seal job into an engine replacement. Oil condition and service history are the only warning most buyers get.
What to look for: Cold start then idle a couple of minutes, blip the throttle and watch for blue-white smoke.
Why it matters: A failing turbo can shed metal into the intercooler and engine on its way out, so a smoky cold start or a whine on boost caught now is far cheaper than a turbo failure that also damages the engine it feeds.
What to look for: Lie beside the car with a torch and look at the transfer case above the right front driveshaft for oil wetting.
Why it matters: Low oil from an unnoticed seal leak leads to a worn and eventually failed transfer case, and CarsGuide notes the repair is not always too difficult but can still be costly, so an oil-wetness check under the car is well worth the two minutes it takes.
What to look for: Check the service history line by line for any gearbox flush, oil additive or engine flush.
Why it matters: Mazda's own scheduled maintenance bulletin states that transmission flushing should only be performed when instructed by the workshop manual, that transmission fluid replacement is only recommended on B-Series and Tribute, that transmission oil additives could lead to internal damage and void the warranty, and that engine oil flushes are unnecessary.
Sources: 1
Got a question about a Mazda CX-7? 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.