Mazda CX-30 DM

1.8-litre SkyActiv-D with low compression ratio. Compact diesel for smaller models with good low-range torque.

• !! DPF Issues with Short-Trip Driving from 130,000 km

  The 1.8 SkyActiv-D also tends toward incomplete DPF regeneration when used predominantly in urban short-trip conditions. Fuel enters the oil and reduces lubrication effectiveness.

  Symptoms: DPF warning in instrument cluster, elevated fuel consumption, oil level rises above dipstick MAX mark from fuel ingress.
  300–2,500 $
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• !! Fuel Ingress into Engine Oil from 25,000 km

  Like all SkyActiv-D generations, the 1.8 is prone to oil dilution from frequent DPF post-injections. Regular oil analysis recommended; shortened service intervals necessary.

  Symptoms: Oil level above MAX, fuel smell when checking oil, onboard computer shows shortened change interval, oil feels thin.
  80–300 $
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• !! EGR Valve Failure from 80,000 km

  Isolated reports of EGR valve failure on the 1.8 SkyActiv-D, sometimes at low mileage. Replacement solves the problem as cleaning alone is insufficient.

  Symptoms: Engine warning, power loss, elevated consumption, fault codes in the P0404/P042E/P1412 range, occasional visible smoke.
  200–800 $
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+ 3 more engine weaknesses + vehicle weaknesses

2.0-litre SkyActiv-G with 24V mild hybrid system. Reduces fuel consumption through regenerative braking and start-stop support.

• ! Intake valve carbon build-up from 100,000 km

  As with all petrol direct-injection engines, combustion residues deposit on the intake valves. PCV oil vapour bakes on under heat. Becomes noticeable from around 80,000–120,000 km.

  Symptoms: Rough idle, cold-start misfires, slight power loss, increased fuel consumption
  300–600 $
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• ! Engine mounts harden in cold weather

  In extreme cold after extended parking, the rubber elements of the engine mounts harden and cause body vibrations. Mazda documented the problem under service information R046/19.

  Symptoms: Vibrations in the interior in cold weather after extended parking; disappears once the engine warms up
  200–500 $
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• ! Hydraulic valve lifters ticking from 40,000 km

  Identical to the non-hybrid PE-VPS: faulty hydraulic valve lifters produce tapping noises from around 30,000–40,000 km. Revised HLAs available from spring 2022. Warranty repair for newer vehicles.

  Symptoms: Deep ticking at warm idle. Noise can be localised by disconnecting the oil pressure sensor.
  200–600 $
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+ 1 more engine weaknesses + vehicle weaknesses

2.0-litre SkyActiv-G with 13:1 compression ratio and chain drive. Core engine of the SkyActiv fleet with a wide power range from 88 to 121 kW.

• !! Carbon build-up on intake valves from 110,000 km

  Direct-injection carbon build-up on intake valves from crankcase breather oil mist. Typically occurs between 100,000–160,000 km. Walnut blasting is the only lasting solution.

  Symptoms: Rough cold start with misfire codes P0300–P0304, sluggish throttle response, increased fuel consumption
  185–800 $
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• !! Low oil pressure — oil pump pressure relief valve from 80,000 km

  Particularly on early build years 2012–2014, contamination in the oil pump pressure relief valve can reduce oil pressure. Persistently low oil pressure accelerates bearing wear considerably.

  Symptoms: Oil pressure warning light illuminates, knocking noises from the engine, increased engine noise at low revs
  350–700 $
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• ! Defective coolant control valve (thermostat)

  A manufacturing deviation in the electric coolant control valve allows coolant to enter the dry chamber. The valve opens too early. TSI R054-21 affects all SkyActiv-G engines.

  Symptoms: Extended warm-up phase, blue coolant warning light, poor heater output at idle
  150–400 $
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+ 3 more engine weaknesses + vehicle weaknesses

2.0-litre with Spark Controlled Compression Ignition (SPCCI) — compression ignition on petrol. Combines diesel efficiency with petrol engine revability, always with 24V mild hybrid.

• !! Recall: PCM air/fuel mixture

  PCM could calculate an incorrect air/fuel mixture, causing power loss or engine stall. Recall AK055A: Mazda3 BP produced June–September 2019, approx. 1,500 vehicles in Germany.

  Symptoms: Unexpected power loss, engine stalls spontaneously, check engine light
  0–0 $
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• !! Roots supercharger failure

  The Roots supercharger required for SPCCI failed on a handful of early vehicles. Mazda cited 4–5 cases worldwide; forum users suspect the actual number is higher.

  Symptoms: Vibration noise from delivery, increasing rough running, SPCCI malfunction
  1,500–4,000 $
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• !! Stumble when switching into SPCCI mode

  During the transition from spark ignition to compression ignition (SPCCI) a noticeable stumble occurs under light acceleration around 2,000–2,200 rpm. Partly resolved by software update, partly by EGR cooler replacement at up to €4,000.

  Symptoms: Brief stumble or hesitation under light throttle around 1,500–2,500 rpm, like a short braking sensation
  0–4,000 $
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+ 3 more engine weaknesses + vehicle weaknesses

2.5-litre SkyActiv-G naturally aspirated engine with cylinder deactivation from 2018. Top of the naturally aspirated range with strong pull.

• !! Cylinder Head Crack (Exhaust Side) from 60,000 km

  Micro-cracks form on the exhaust side of the cylinder head due to thermal stress. Primarily affects 2019–2020 CX-5 and Mazda6. Mazda extended the warranty to 10 years/120,000 miles. Revised head design from 2021.

  Symptoms: Sweet coolant smell after shutdown, dropping coolant level with no visible puddle, steam from engine bay
  2,000–8,000 $
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• !! Recall: Cylinder Deactivation Valve Lash Adjuster

  PCM software incorrectly controls hydraulic valve lash adjusters during the transition out of cylinder deactivation. Intake valve rocker arm can contact engine components. CX-5 KF 2017–2019, approx. 58,000 vehicles in Europe.

  Symptoms: Misfires, power loss, rough running when upshifting out of cylinder deactivation
  0–0 $
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• !! Fuel Pump Impeller Fracture

  Recall for 2019–2020 CX-5: the low-pressure fuel pump impeller can fail due to cracking. Mazda notified owners in November 2021. Engine stall possible.

  Symptoms: Engine won't start, power loss, irregular engine running, engine warning light
  300–800 $
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+ 3 more engine weaknesses + vehicle weaknesses