Buying a used NC Miata: the years to target and the leak to rule out

The NC Miata is a rear-drive Mazda roadster with 166 to 170 hp, and even the newest one is now more than ten years old. Buy one, but check the floor before you check the engine. Of the 71 owner complaints filed with NHTSA against 2006-2015 MX-5s, 14 describe water in the cabin, and all 14 are on 2006-2008 cars. Nine of them blame blocked soft-top drains. Mazda wrote three service bulletins about exactly that between 2007 and 2010. None was a recall.

I'm Dana, Revnut's editor. Revnut doesn't road-test cars, so I won't pretend I've driven an NC. What I did do is read every complaint and recall NHTSA holds for the 2006-2015 MX-5, the service bulletins Mazda filed with NHTSA, Mazda's own press kits and owner's manual, and turn them into the checklist below.

The specs, by sub-generation

Mazda changed the NC twice: a substantial refresh for 2009 and a new front end for 2013. The usual shorthand is NC1, NC2 and NC3.

	NC1	NC2	NC3
Model years (US)	2006-2008	2009-2012	2013-2015
Power, manual	170 hp at 2006 launch; 166 hp @ 6,700 rpm by 2008	167 hp @ 7,000 rpm	167 hp @ 7,000 rpm
Power, automatic	158 hp (2008 figure)	158 hp @ 6,700 rpm	158 hp @ 6,700 rpm
Torque	140 lb-ft @ 5,000 rpm	140 lb-ft @ 5,000 rpm	140 lb-ft @ 5,000 rpm
Redline	6,700 rpm	7,200 rpm (6,700 auto)	7,200 rpm (6,700 auto)
Gearboxes	5-speed manual, 6-speed manual, 6-speed automatic	same	same
Roof	Soft top; Power Retractable Hard Top from 2007	Soft top or PRHT	Soft top or PRHT

Why the numbers don't line up: the 170 hp figure that still turns up in listings (and on Revnut's own spec page) is the 2006 launch number, as MotorWeek reported it (MotorWeek). By the 2008 model year, Mazda's own release quoted 166 hp at 6,700 rpm, 158 for the automatic (Mazda, 2008). For 2009, Mazda raised the redline 500 rpm to 7,200; Jalopnik's first drive lists a forged steel crank and connecting rods, stronger wrist pins and firmer valve springs, at "still 167 HP" (Jalopnik). Mazda's 2011 spec deck confirms 167 hp at 7,000 rpm, 158 at 6,700 for the automatic, and a 6,700 rpm automatic redline (Mazda spec deck). Same engine family, different rating, different internals.

The weight spread is small. Mazda lists 2,447 lb for a 5-speed Sport and 2,619 lb for a fully equipped car with the PRHT (Mazda, 2013). The EPA rates every manual NC at 24 mpg combined and every automatic at 23, all on premium (fueleconomy.gov).

The failure that matters: water in the cabin

This one won't stop the engine. It rots the car around it instead.

I sorted all 71 complaints by what the owner described. Water getting into the cabin shows up in 14 of them: 9 on 2006 cars, 3 on 2007 and 2 on 2008. From 2009 to 2015, there are none.

The pattern in the narratives is the same every time. Rain, or a car wash, and the footwells fill. "The convertible roof itself does not leak. It is the design of the roof drainage system," one 2006 owner wrote (NHTSA complaint 10520735). A 2007 owner in Austin found about 6 inches of water on the driver's side after a hard rain; the dealer's lead technician told them "I have seen this problem too many times and the problem is with drain holes on each side of the convertible top that get clogged with debris" (complaint 10450101). Another 2007 owner was quoted "approx. $700.00" by a Mazda dealer to clear the drainage system (complaint 10597377).

Left alone, it gets expensive. One 2006 owner who bought from a used-car dealer in 2011 reported "at least 50 floods to date," and wrote: "The floors are rusted. The bolts that hold the seats in place are severely rusted" (complaint 10605600). A 2007 owner reported a passenger-side leak that rusted the front cross frame and got the airbag wiring wet (complaint 11479887). Another 2006 owner only noticed a musty smell for six months, until a night parked outside left 4 to 6 inches of water in the car (complaint 10659886).

Mazda knew. Its bulletin 09-021/09 says "some vehicles equipped with the folding soft top may experience water accumulation in the foot wells due to the soft top drains becoming clogged with leaves and other debris" (NHTSA). The last version, 09-046/10 from October 2010, covers 2006-2009 soft tops (NHTSA). A bulletin tells dealers how to fix something when an owner complains. It doesn't oblige anyone to go looking. Owners in the complaints say Mazda's fix adds drain valves and filters, and that they paid for it themselves once the warranty ran out (complaints 10520735 and 11219807).

Here's the catch for a buyer: a clean title won't show this. NMVTIS, the Department of Justice's title database, catches cars that insurers or salvage yards declared totalled or flooded (NMVTIS). A Miata that flooded itself in a driveway may never have been an insurance claim at all. One of those 2006 owners says their insurer "refused to help," on the grounds the damage probably happened before they bought it (complaint 10585977).

What I'd do:

• Lift the carpet. On any 2006-2009 soft top, pull back the footwell carpet on both sides and press the padding. Damp, stained or rusty underneath is a walk-away unless the price reflects new carpet and floor work.
• Smell it with the top up. Six months of musty smell came before one owner's flood. Air freshener in a Miata for sale is a question to ask.
• Ask whether the drains were serviced. An invoice that mentions the soft-top drain bulletin (09-046/10 or earlier) is the best line in an NC1 service history.
• Keep them clear afterwards. Mazda's own 2014 owner's manual tells you to remove leaves around the soft top, "otherwise, the water drainage outlets could become blocked, resulting in water leakage" (Mazda owner's manual). It gives the hard top the same warning.

Soft top or PRHT, manual or automatic

Roof. The Power Retractable Hard Top arrived for 2007. Mazda says it adds about 80 lb, and that the PRHT car got firmer dampers, stiffer rear springs and a thicker front anti-roll bar to compensate (Mazda PRHT release). It opens or closes in 12 seconds. Mazda's drain bulletins name soft-top cars only, and none of the 14 water complaints mentions a hard top. Only one complaint concerns the PRHT mechanism itself: a 2007 whose top "catches" going up and down even after the dealer replaced the motor (complaint 10854645). Before you buy one, cycle it several times. It should be smooth and quiet, with no pause partway.

Pick the PRHT if the car lives outside or you want a quieter, more secure daily. Pick the soft top if you want the lightest car and you'll keep the drains clear.

Gearbox. The 5-speed came on the base Sport, the 6-speed on the others, and the 6-speed automatic was an option. The automatic gives up 9 hp and 500 rpm of redline from 2009 on. Mazda never rated it higher than 158 hp in the releases I found.

Manual complaints cluster on early cars. Mazda's bulletin 0501007 covers "clutch hard to disengage" on 2006-2007 cars built before March 1, 2007 (NHTSA). One 2006 owner reported the clutch bite point creeping up the pedal at 1,200 miles (complaint 10151222). Another, a 2007, said the gearbox "sometimes will not go into 2nd gear on the first few attempts," worse in the cold (complaint 10238069). Seven complaints in total concern the manual gearbox or clutch, six of them on 2006-2008 cars.

Buy the manual. It's the car the NC was built around, and from 2013 Mazda bundled Bilstein dampers and a limited-slip differential with the manual Club (Mazda, 2013).

What else the complaints flag

• Airbag warning light or passenger seat sensor: 10 complaints, eight of them on 2006-2007 cars. Most describe the passenger airbag light staying on or the seat weight sensor failing. A 2007 owner with 11,752 miles was quoted "approximately $2,000 just for the parts" for a weight sensor, seat track adjuster and SAS unit (complaint 10671371). Another was quoted $1,281.03 for the seat weight sensor and $523 for its control unit (complaint 10504035). Mazda's multi-model bulletin 08-001/13 covers troubleshooting the passenger airbag deactivation light on 2006-2014 MX-5s.
• Tires: 5 complaints, mostly blowouts or sidewall cracks on specific tires, not the car. One worth knowing: a 2007 owner found the car had no spare, only a sealant kit, and the kit couldn't seal a pothole cut (complaint 10237048). Mazda's maintenance schedule lists a flat tire repair kit, not a spare.
• Suspension: 4 complaints. One 2007 owner reported the rear toe control link failing at 50 mph at 107,000 miles (complaint 10947473).
• Seat belts not retracting: 3 complaints, two on 2006 cars.
• Fuel smell or check-engine light from the filler neck: Mazda's bulletin SB-01-041-09 covers a P0455 code on 2006-2007 cars "due to poor sealing between the fuel filler pipe and fuel filler cap" (NHTSA). Two owners describe it (complaints 10627097 and 11128161).

One recall applies: campaign 06V103000 on some 2006 cars, where the bolt holding the horn assembly to the steering wheel hub could fail during a driver's airbag deployment in extreme cold. Dealers replace the driver's airbag module free. On 2015 cars built May 21 to August 1, 2014, Mazda also ran Special Service Program 97 to replace a trunk lid latch that could stop opening electrically (Mazda SSP 97). That program ended on May 31, 2022, so on a 2015 just ask whether it was done. Run the VIN for the recall.

Modified cars: what you're actually buying

Mazda's own 2008 release says the MX-5 is "driven by racers every weekend at race tracks across the country" (Mazda, 2008). Plenty of NCs for sale have been modified, tracked or both. That isn't a reason to walk away. It does change what you check.

• Suspension. Springs, dampers and coilovers are the most common change and the least risky. Miata parts maker Flyin' Miata sells NC spring and Koni damper kits and lists them as "Emissions do not apply" (Flyin' Miata). Look for uneven tire wear and ask for the stock parts.
• Turbo kits. Flyin' Miata says its NC turbo kit makes "roughly 220 hp at the wheels" at 8 psi and about 240 at 11 psi, and it carries a California Air Resources Board Executive Order (D-601-6), which makes it legal in all 50 states (Flyin' Miata turbo). Read the fine print, though. The company recommends "an 8 psi boost limit on 2006-08 cars as well as automatic cars due to their cast engine internals." A boosted NC1 running more than that has a story you need to hear.
• Exhaust and emissions. This is where registration trouble starts. Flyin' Miata's own NC midpipe has a catalytic converter "certified to federal levels, not California," and it won't ship to California, Colorado, New York or Maine (Flyin' Miata midpipe). A car with no catalytic converter at all is a bigger problem. EPA's tampering policy says the Clean Air Act's prohibitions "apply for the entire life of vehicles, engines, and equipment. They apply regardless of whether the regulatory 'useful life' or warranty period has ended" (EPA). Age doesn't make a catless car legal.

How to spot a hard-used car. Mazda's owner's manual moves a car to its stricter Schedule 2 when it sees "extended use of brakes" or continual mountain driving: oil every 5,000 miles instead of 7,500, and manual gearbox and differential oil at 30,000 miles as well as 60,000 (Mazda owner's manual). A car that was tracked should have records like that. Beyond the paperwork, look for:

• Rubber pellets or melted rubber on the sills and inside the wheel arches.
• Brake pads, rotors or fluid that aren't stock, and discoloured rotors.
• Bolt holes or marks from a roll bar or harness mounts behind the seats.
• Heavy wear on the driver's seat bolster and the shift knob.
• Leftover number or class decals, or a track-day tech-inspection sticker.

None of those rules a car out. Each one means you ask the seller how it was used, and for how long.

Reading the listing

Before you drive anywhere, the ad and a couple of checks will rule out most bad cars.

• Year and roof first. A 2006-2008 soft top needs the water checks above. A 2009-2015 car, or any PRHT, mostly doesn't.
• Service records, not "full service history." Mazda's normal schedule calls for oil and filter every 7,500 miles or 6 months, spark plugs every 75,000 miles, and manual gearbox and differential oil at 60,000 (Mazda owner's manual). Ask for the invoices.
• The VIN. Run it through NHTSA's recall lookup, and get a title report from an approved NMVTIS provider. NMVTIS is the only vehicle history database that all states, insurers and junk and salvage yards are required by federal law to report to.
• Modification words. "Turbo," "FM," "coilovers," "track car," "autocross," "catless," "test pipe." None of those is a reason to walk away on its own. All of them mean the questions in the section above.
• Photos. Ask for the footwells with the carpet pulled back on an NC1 soft top. A seller who won't is telling you something.

The first inspection

Arrange to see the car cold, ideally after rain. Ask the seller not to start it before you arrive.

1. Footwells and trunk. Before anything else, check the carpet, padding and trunk floor for damp, stains and rust. Mould smell counts.
2. Cold start. Mazda's bulletin SB-01-028-10 describes a "loud ticking noise" from the variable valve timing actuator when some 2006-2008 engines are first started (NHTSA). Listen for it, and ask whether it's been addressed.
3. Warning lights. The airbag light should come on with the ignition and go out. With the passenger seat empty, check that the passenger airbag indicator behaves, and move the seat back and forth. One 2007 owner's lights only went out when the empty seat was slid forward (complaint 10504035).
4. The roof. Soft top: check the drains on each side of the top for leaves and dirt, and the fabric and rear window for tears. PRHT: cycle it at least three times.
5. Clutch and gearbox. Check where the clutch bites, and run through every gear cold and warm. Second gear that won't go in cold is an owner-reported complaint on early cars. On a tuned car, assume the clutch has done hard work.
6. Coolant and leaks. Coolant at the right level, no crust around the expansion tank or hoses. Look underneath for fresh oil.
7. An independent inspection. Even the Department of Justice's NMVTIS leaflet tells used-car buyers to "consider an independent inspection before purchasing a used vehicle." Book one with a Mazda specialist and ask them to check the floors and the soft-top drains.

After you buy: the first jobs

Assume nothing was done unless there's an invoice for it.

• Clear the soft-top drains. On any soft-top car, and especially a 2006-2009, make it the first job. If the carpet has been wet, dry or replace the padding before the floor rusts.
• Oil and filter. Mazda's 2014 owner's manual specifies SAE 0W-20 for the US, about 4.8 US quarts with the filter on a 6-speed car (4.7 on others). Older NCs may list a different grade, so check the manual for your model year.
• Gearbox and differential oil. On Mazda's schedule at 60,000 miles (30,000 on Schedule 2). 75W-90 GL-4 is what the 2014 manual lists for the 6-speed.
• Brake and clutch fluid. They share a reservoir. Mazda specifies DOT 3. If the car was tracked, ask what went in and when.
• Spark plugs. On Mazda's schedule at 75,000 miles (60,000 on the US Schedule 2).
• A tire plan. Expect a sealant kit, not a spare. Check the sealant bottle's expiry date, which Mazda says to do every year, and consider carrying a plug kit.
• Recalls. If the VIN check shows anything open, any Mazda dealer does recall work free.

Which one I'd buy

A 2009-2015 manual. NC2 and NC3 cars get the 7,200 rpm redline and the stronger engine internals. Of the 22 complaints filed against them, none describes water in the cabin. If you can find one, a 2013-2015 Club with the 6-speed comes with the Bilstein and limited-slip package as standard.

A 2006-2008 only with dry floors and a lower price. These are the oldest NCs, with all 14 water complaints between them. A PRHT NC1 sidesteps the soft-top drain issue. A soft top needs proof the drains were done, or a seller who lets you pull up the carpet.

One honest limit on all of this: complaint counts aren't failure rates. They're self-reported, US-only, and not divided by how many cars were sold. Seventy-one complaints across ten model years is a small number. Newer cars have also had less time for owners to file. Still, 14 water complaints on NC1 cars and none afterwards, plus three Mazda bulletins on the same problem, is too clear a pattern to ignore.

Who should skip it

If you want more than 167 hp without modifying anything, skip the NC. Look at the ND that replaced it instead; a turbo NC is a modified car, with every question that comes with it. If you want an automatic and care about performance, the NC's automatic gives up 9 hp and 500 rpm to the manual. And if a 2006-2008 soft top will live outside under trees, budget for clearing the drains every season, or buy the hard top.

Where it sits on Revnut

On Revnut, the NC sits at #113 of 378 generations by REVs, fourth of the four Miatas. The NA has more than three times its REVs, and the ND that replaced it and the NB before it are both ahead. Revnut's own page calls it the Miata that got too big. If you're buying with your head, that's the opportunity. If it's the one you'd buy, REV it on its page.

How this was made

Written by Dana Miles, Revnut's editor, from the sources below. The complaint figures come from NHTSA's public complaint database for 2006-2015 Mazda MX-5s (filed as "MX-5/ MIATA" for 2006-2010 and "MX-5" for 2011-2015), pulled on 12 October 2026: 71 complaints in total. I matched keywords in each owner's narrative and then read all 71 in full, so one complaint can count toward more than one problem. Quotes from owners are exact apart from capitalization, which I've normalized. Mazda's service bulletins come from NHTSA's manufacturer-communications record for the same model years.