If you are considering buying a used Mazda CX-3, these are the common problems worth knowing about first. Our garage database tracks 2 known faults for this model. Every one below is a repair bill a seller has good reason not to mention.
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Is the Mazda CX-3 reliable?
The Mazda CX-3 has 2 known faults in our database, 0 of them rated high severity. The most serious are engine (the 1.5 diesel can throw a DPF warning with the oil level rising) and bodywork and trim (the air conditioning fails on 2015 to 2017 cars). None of them makes the car a bad buy on its own; the risk is a seller who knows and says nothing.
That is a count of the faults we hold, not a reliability score. Popular cars get written about more, and a newer generation has had less time to show its faults.
Generation 1 of 12 known faults · 7 owner reports · 4 good notes
Mazda CX-3 Mk1 DK (2015 to 2021) problems
OtherMedium severity💬 4 owner reports, 2017 to 2019
The air conditioning fails on 2015 to 2017 cars: a new car's air conditioning failed in February 2017 and was still unfixed in July, when Mazda said it was aware of an issue with the condensers and evaporators on certain Mazda2 and CX-3 cars, resolved in production; a Milton Keynes dealer quoted eight weeks for condenser parts in September 2017; a March 2017 car's trouble began in April 2017 and carried on into 2018 through two replacement condensers; and a 2016 2.0 petrol at 16,000 miles never got properly cold after a part from Japan was fitted.
Rough guide
£300-900
Typical symptoms
air conditioning blowing warm or only slightly cool
system needing a recharge every year
compressor not engaging
Affected vehicles
Engines:
All early cars
Typical mileage:
5000-30000 miles
🔍 We have a specific pre-purchase check for this faultCheck an advert →
Engine/EmissionsMedium severity💬 3 owner reports, 2017 to 2019
The 1.5 diesel can throw a DPF warning with the oil level rising: on a 2016 car bought at 4,000 miles the DPF light flashed with the oil above maximum and the dealer diagnosed faulty injectors, a fault it said Mazda knew about; a 2016 1.5D 4WD needed new injectors to cure a DPF warning; and another 2016 diesel's DPF light flashed at 28,000 miles despite regular 30 to 40 mile runs at 50 to 65 mph. The infotainment's i-stop page shows when a regeneration is running, which helps owners avoid interrupting it.
Rough guide
£150-1500
Typical symptoms
DPF warning light flashing
oil level above the maximum mark
frequent regenerations with a hot smell and poor economy
Affected vehicles
Engines:
1.5 Skyactiv-D diesel
Typical mileage:
4000-30000 miles
🔍 We have a specific pre-purchase check for this faultCheck an advert →
What owners report on the Mk1 DK
7 single reports, unconfirmed
One owner each, in their own words rewritten as a line, and not counted in our risk scoring. A fault joins the list above once a second report or an editorial source backs it.
Interior · August 2019A 2016 Mazda CX-3 1.5D 4WD had an air conditioning recall addressed during its ownership.
Interior · June 2019The air conditioning in a 2016 Mazda CX-3 2.0 Skyactiv G with 16,000 miles never gets sufficiently cold, requiring a replacement part from Japan.
Exhaust · January 2019A 2016 Mazda CX-3 2.0 diesel, driven 28,000 miles, experienced a flashing DPF warning light.
Interior · June 2018A March 2017 Mazda CX-3 had recurring air conditioning problems, with two condensers replaced and a third failing within a week.
Interior · September 2017The air conditioning condenser failed on a 2015 Mazda CX-3, with a dealer quoting an eight-week wait for replacement parts.
Engine · August 2017A 2016 Mazda CX-3 1.5 Skyactiv D experienced a rising engine oil level and a flashing DPF light at 4,000 miles.
Interior · July 2017The air conditioning on a new Mazda CX-3 failed in February 2017 and remained unfixed, with issues noted on condensers and evaporator units.
What owners like about the Mk1 DK
4 notes
The vehicle offers excellent driving dynamics, providing an engaging experience for the driver, combined with impressive ride comfort.
The cabin features a high quality interior, with materials and finishes that contribute to a premium feel.
This particular model is available with an all-wheel drive option, enhancing traction and stability in various conditions.
The 2015 model achieved a four-star Euro NCAP rating, with strong scores for adult and child occupant safety.
Sellers rarely admit these faults outright
We track 6 specific phrases sellers use in adverts to soft-pedal these exact issues. Paste any Mazda CX-3 advert and we check it in seconds.
Repair costs are typical UK ranges, not quotes. Actual cost depends on condition and garage.Data last verified: October 2026
Mazda CX-3 buying questions
What should I check when viewing a used Mazda CX-3?
Ask the seller about the engine and bodywork and trim faults on this page and whether they have been fixed, with invoices. On the test drive watch for DPF warning light flashing and air conditioning blowing warm or only slightly cool. Read the MOT history for repeat advisories, then paste the advert into the free check, which reads it against its known faults before you travel. Check a Mazda CX-3 advert →
What is the real MPG of a Mazda CX-3?
Owners report 46.3 mpg on average across the Mazda CX-3 engines with data, about 92% of the official combined figure. The gap between official and real-world economy varies a lot by engine, so the Real MPG page lists every engine and generation separately, from 268 owner submissions. Mazda CX-3 Real MPG by engine →
If you used to check the Honest John “Good & Bad” section before the site closed in 2026, this page is where that information now lives. We rebuilt the Mazda CX-3 owner-report history from the archived Honest John dataset, added our own research, specialist and owner-club sources and DVSA recall data, and we keep it free. Each fault above is badged with its source. The same data feeds our free advert check, which reads a listing against every known fault for the exact engine and year.