Mazda 6 2014-2019 problems, engine, fuel economy, pros and cons

Updated: October 22, 2019

After Mazda ended its partnership with Ford, it had to come up with new in-house developed products to prove itself. The third-generation Mazda 6 is one of them. It's a sleek front-wheel drive family sedan with sporty handling. In the past, Mazda 6 offered an optional Ford-sourced V6.

2015 Mazda 6 interior
2015 Mazda 6 interior

The 2014-2019 Mazda 6 comes with the 2.5L Mazda Skyactiv 4-cylinder engine. Thanks to Skyactiv technology, Mazda 6 is one of the most fuel-efficient family sedans on the market.

For 2018, the 2.5L turbo engine has been added to the lineup. Mazda 6 is one of the few cars that still offers a conventional automatic transmission. Mazda 6 is a driver-oriented vehicle, it holds the road very well, with precise, well-controlled steering. The ride is on the firm side. The reliability is above average, but there are problems to watch out for.

Mazda 6 problems: There are several complaints about the mass air flow sensor failing. A bad mass air flow sensor can cause a no-start and stalling. The sensor is easy to replace. The part is sold online for $135-$160.

Mazda 6
2015 Mazda 6.

A sticking switch inside the transmission shifter assembly can cause the vehicle to stay intermittently in Accessory mode with the audio system staying on and draining the battery. There are a number of reports on the NHTSA website about this issue. To repair the problem, the switch or the whole shifter lever assembly must be replaced ($320-$550 repair). There are several Youtube videos about the same problem in the CX-5.
A failed ignition coil can cause a lack of power and the Check Engine light to come on with misfiring codes. The bad ignition coil must be replaced with an updated part. It's a good idea to replace all the spark plugs at the same time if they are old.
At higher mileage, the carbon buildup on the valves can also cause the engine to misfire. This problem is common for direct-injected engines. The solution is to clean the valves with a special spray or manually.

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To clean the valves manually, the intake manifold has to come off.
Several owners mentioned various problems with Mazda Connect infotainment system. Some glitches were fixed with firmware updates or resets. Check for more information at the Mazda Connect website. The overall number of complaints is small compared to some other cars. Mazda issued several recalls. Check at the NHTSA website.

Mazda 6 engine
Mazda 6 2.5L Skyactiv engine

Engine: The base engine is the 184-hp 2.5L DOHC 4-cylinder Skyactiv-G motor. It has a higher compression ratio (13.0:1) and direct fuel injection. It's one of the best engines on the market. It has proven to be reliable if maintained well. Read also: Pros and cons of buying a car with Direct Injection.
For 2018, the Skyactiv-G 2.5L engine received the cylinder deactivation option.
The 227-hp turbocharged version (Skyactiv 2.5T) was also added for 2018. See the Mazda video about the Skyactiv Turbo technology. The 2.5L turbo is a fairly new engine to know its long-term reliability. This engine has been used in the 2016 and newer CX-9 and so far it didn't have too many problems. A turbocharged engine is sensitive to the oil quality; use only high-quality synthetic oil.

Timing belt or chain: Bot the 2.5L and 2.5T Skyactiv gasoline engines have a timing chain that doesn't need regular replacement. There is no timing belt.

Mazda 6 EPA Fuel Economy: mpg
city/hwy
L/100 km
city/hwy
2014-2015 2.5L with i-ELOOP auto 28/39 8.4/6.0
2016 2.5L with i-ELOOP auto 28/38 8.4/6.2
2017 2.5L with i-ELOOP auto 27/35 8.7/6.7
2014-2016 2.5L auto 26/37 9.0/6.4
2017-2019 2.5L auto 26/35 9.0/6.7
2014, 2016 2.5L 6-speed manual 25/36 9.4/6.5
2015 2.5L 6-speed manual 25/35 9.4/6.7
2017 2.5L 6-speed manual 24/34 9.8/6.9
2018-2019 2.5L 6-speed manual 24/33 9.8/7.1
2018-2019 2.5L Turbo auto 23/31 10.2/7.6

Fuel Economy: The 2015 Mazda 6 automatic with i-ELOOP system is rated at 28/39 mpg city/hwy. The i-ELOOP system, available in the GT Technology Package uses a capacitor installed inside the front fender to recover the energy when slowing down to re-use later. It's like a very mild hybrid.
The regular 2014-2016 Mazda 6 automatic gets 26 mpg city, 37 mpg highway. This allows Mazda 6 to travel up to 574 highway miles (924 km) on one tank of regular gasoline.

Pros: Fuel economy, sporty handling, supportive seats, conventional 6-speed automatic transmission, available 6-speed manual, 5-star crash test rating, available safety features, rich interior.

Cons: Road and wind noise in earlier models, firm ride, no V6, rear seat space, low front bumper is easy to scrape, OEM tires wear fast, the trunk is not very large.

Similar cars:

Overall: Mazda 6 is a sporty option for a family sedan. Overall, it's a great car, but earlier models are not very quiet inside. The 2017 and later models have better sound insulation.

Rear seat

Rear seat

Trunk

Mazda 6 trunk offers 14.8 cu. ft. of cargo space

Rear seat folded

The rear seat folded

The reliability is above average, maintenance costs are low too. We would recommend a non-turbo Mazda 6 if you plan on keeping the car for many years.

What to look for when buying a used Mazda 6: Check if the infotainment system works properly. Watch out for rattling door speakers. Check if both key fobs work. Test the air conditioner and other features. Watch out for warning lights staying on after the engine is started. See if the power seat mechanism works properly.

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If the audio system stays on when the car is turned off, there is a problem with the shifter, see above. Watch out for signs of previous accidents, or lack of maintenance, read more here: How to inspect a used car.

Engine oil: The owners manuals for the 2014-2017 Mazda 6 list SAE 0W-20 as the recommended oil type. The engine oil capacity for the 2.5L engine is specified at 4.5 L (4.8 US qt, 4.0 Imp qt) with oil filter replacement.

Automatic transmission fluid: For the 2014 model, Mazda specifies Mazda Genuine ATF FZ, as the required automatic transmission fluid. The full automatic transmission capacity is listed at 7.8 L (8.2 US qt, 6.9 Imp qt), but only around 3.5 US qt (3.3 liters) can be drained from the transmission drain plug. We checked the owners manuals for the 2014-2017 Mazda 6 and none of them includes the automatic transmission fluid (ATF) change in the maintenance schedule. However, your mechanic may still recommend changing the ATF, as it degrades over time. By Samarins.com Staff




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