The 2021 MG ZS is a budget-friendly subcompact crossover from the revived MG brand (SAIC ownership). Build quality is acceptable for the price point, but suspension components and transmission mounts wear prematurely, particularly on the 1.5L gas variants with the 4-speed automatic.
Premature Transmission Mount Failure
Common · medium severityTypical onset: 40,000-70,000 mi
Symptoms: clunking on acceleration or deceleration, excessive engine movement visible under hood, vibration in cabin at idle, shudder during shifts
Fix: Replace front and/or rear transmission mount. The rubber degrades faster than expected; budget 2.5-3.5 hours labor. Many techs replace both mounts simultaneously since access is similar and prevents a comeback.
Estimated cost: $400-700
Rear Control Arm Bushing Deterioration
Common · medium severityTypical onset: 50,000-80,000 mi
Symptoms: clunking over bumps from rear, rear-end feels loose or wallowy, uneven rear tire wear, steering wander on highway
Fix: Rear lower control arm bushings (and sometimes trailing arm bushings) crack and separate. You can press in bushings, but most shops replace the entire arm assembly due to poor bushing availability. Budget 3-4 hours for both sides including alignment.
Estimated cost: $600-1,000
Front Upper Control Arm Bushing Separation
Occasional · medium severityTypical onset: 60,000-90,000 mi
Symptoms: knocking noise over bumps, steering pull to one side, excessive camber wear on front tires, steering feels vague
Fix: Front upper control arm bushings crack, especially in cold climates. Full arm replacement is typical—bushings alone aren't readily available aftermarket. 2.5 hours per side plus alignment. Do both sides to avoid a return visit.
Estimated cost: $500-850
Transmission Fluid Overheating (4-Speed Auto)
Occasional · medium severityTypical onset: 50,000-100,000 mi
Symptoms: harsh or delayed shifts when hot, transmission slipping in 3rd or 4th gear, burning smell from trans area, check engine light with trans temp codes
Fix: The 4-speed automatic runs hot under sustained load (highway towing, mountain driving). Transmission oil cooler can develop internal leaks or clog. Replace cooler and flush system; 3-4 hours labor. Some owners add an auxiliary cooler as preventive.
Estimated cost: $600-1,100
ABS Pump Module Failure
Rare · high severityTypical onset: 60,000-120,000 mi
Symptoms: ABS and traction control lights illuminated, loss of ABS function, brake pedal feels soft or spongy, grinding noise from ABS unit during normal braking
Fix: The Bosch ABS pump/module assembly fails internally—moisture intrusion or internal valve sticking. Replacement unit plus bleed and coding; 2.5 hours labor. Used modules from overseas are common but risky without warranty.
Estimated cost: $1,200-2,000
CV Axle Boot Tears and Axle Failure
Occasional · medium severityTypical onset: 70,000-110,000 mi
Symptoms: clicking or popping on tight turns, grease splattered on inner wheel well, vibration during acceleration, clunking when shifting from park to drive
Fix: CV boots tear early, contaminate the joint, and cause failure. If caught early you can reboot, but most are too far gone. Replace both front axles; 3 hours labor for the pair. OE-quality aftermarket axles are inconsistent—stick with known brands.
Estimated cost: $450-750
Acceptable budget transportation if you're handy or have a good indie shop, but suspension and drivetrain durability lag competitors—factor in $1,000-1,500/year for repairs after 50k 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.