The 2021 CX-3 is largely a carryover from its 2016 debut with the SkyActiv 2.0L four-cylinder and six-speed auto. It's mechanically solid but shares platform quirks with Mazda2 roots—watch transmission mounts, minor oil consumption, and the rear camera recall.
Transmission Mount Failure (Rear/Torque Mount)
Common · medium severityTypical onset: 50,000-80,000 mi
Symptoms: Clunking on hard acceleration or deceleration, Vibration felt through shifter at idle, Excessive drivetrain movement visible during coast-down
Fix: Replace rear transmission mount; requires subframe support and partial exhaust drop. 1.5-2 hours labor. OEM mount recommended—aftermarket versions often fail prematurely.
Estimated cost: $250-450
Backup Camera Lens Fogging/Failure (NHTSA Recall)
Occasional · medium severitySymptoms: Foggy or distorted camera image in reverse, Intermittent camera display loss, Moisture visible inside lens assembly
Fix: Recall 0821F addresses water intrusion causing short-circuit risk. Dealer replaces camera and reseals. If out of recall scope, aftermarket camera install runs 1 hour labor plus $150-300 part.
Estimated cost: $0 (recall) or $250-450 (non-recall)
Mild Oil Consumption (2.0L PE-VPS)
Occasional · low severityTypical onset: 60,000-100,000 mi
Symptoms: Oil level drops 0.5-1 qt between changes (5,000 mi intervals), No external leaks visible, Faint blue smoke on cold start after sitting overnight
Fix: Mazda considers 1 qt per 1,000 mi 'normal' but real-world consumption around 1 qt per 3,000 mi is common. Valve stem seals are typical culprit; replacement involves head removal, 8-10 hours labor. Most owners just top off between changes unless consumption accelerates.
Estimated cost: $1,200-1,800 (seal replacement) or $15/qt top-offs
Transmission Fluid Cooler Line Seepage
Occasional · low severityTypical onset: 70,000-110,000 mi
Symptoms: Small ATF drips near front of transmission bellhousing, Fluid level gradually drops over months, No shift issues initially, may develop slip if neglected
Fix: Cooler line O-rings harden and weep. Lines run along subframe—accessible from underneath with lift. 1.5 hours labor includes drain/refill. Replace both lines and O-rings as set.
Estimated cost: $300-500
Rear Wheel Bearing Noise
Occasional · medium severityTypical onset: 80,000-120,000 mi
Symptoms: Humming or growling from rear that increases with speed, Noise changes pitch during turns, ABS/traction light may trigger if sensor damaged
Fix: Hub assembly is pressed into knuckle—requires hub puller and press work. Most shops replace entire knuckle assembly to avoid press time. 2-2.5 hours per side labor.
Estimated cost: $400-650 per side
Front Lower Control Arm Bushings
Common · low severityTypical onset: 60,000-90,000 mi
Symptoms: Clunking over bumps at low speed, Vague steering feel or minor wander, Tire feathering on inner edge if severe
Fix: Rear bushings in lower arms tear from road salt and flex. OEM arms come with bushings installed—no press work needed. 2 hours labor both sides includes alignment.
Estimated cost: $500-750 (both sides + alignment)
Solid daily driver if maintained—avoid high-mileage examples with no trans fluid service history, but otherwise a safe used buy under 80k miles.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.