Home / Common Problems / MG Zs

MG Zs Problems & Known Issues

The most common MG Zs problems ranked by severity — what to watch for, what it costs to fix, and what happens if you ignore it.

Generations

MK1 — First Generation
2001–2009
1.6 Petrol, 1.8 Petrol, 2.0 TDI, 2.5 V6
MK2 — Second Generation
2017–2022
1.0T Turbo, 1.5 VTi-TECH

Top issues to watch for

The most serious MG Zs problems ranked by severity. We track 5 known issues — here are the ones you need to know about first.

Dangerous
Structural corrosion around suspension mounting points (MK1)
MK12001–200940k–150k miles
The subframe and structural areas around suspension component mounting points suffer from severe corrosion on first-generation MG ZS models. The steel used in these prescribed areas appears particularly susceptible to salt damage, with corrosion compromising load-bearing capacity much earlier than typical for the vehicle age. MOT data shows this model fails structural integrity tests at over 40 times the national average, with the problem worsening year-on-year. This affects vehicle safety as suspension loads can no longer be adequately transmitted through the structure.
What happens if ignoredStructural failure around suspension mounting points creates an immediate safety risk. The suspension can detach from the vehicle or lose proper geometry, causing loss of control. MOT failure is certain once corrosion reaches prescribed limits. Professional welding and structural repair costs £2,000-£5,000 depending on extent, often exceeding the vehicle's value.
Independent garage
£1,500–£3,500
Specialist
£2,000–£4,500
Main dealer
£2,500–£5,500
Parts only
£300–£800
Major
General body corrosion (MK1)
MK12001–200940k–150k miles
First-generation MG ZS models suffer from widespread body corrosion that significantly reduces structural rigidity. The corrosion extends beyond surface rust to structural elements, compromising the vehicle's overall integrity. This is distinct from but often accompanies the more critical subframe corrosion issues.
What happens if ignoredExtensive body corrosion reduces crash protection and structural rigidity. MOT failure becomes increasingly likely as the vehicle ages. While not immediately dangerous like subframe corrosion, widespread body rust makes the vehicle uneconomical to repair when combined with other age-related issues. Repair costs vary enormously depending on extent but can easily reach £3,000-£6,000.
Independent garage
£800–£3,000
Specialist
£1,200–£4,000
Main dealer
£1,500–£5,000
Parts only
£200–£1,000
Major
Handbrake efficiency failure
MK1, MK22001–202220k–150k miles
MG ZS models across both generations suffer from handbrake efficiency problems at over 13 times the national average rate. The handbrake fails to meet minimum legal requirements for holding the vehicle stationary on a gradient. This typically results from cable stretch, adjuster wear, or rear brake shoe/pad deterioration. The issue affects all engine variants and appears consistently across the model's production life.
What happens if ignoredInsufficient handbrake performance is an immediate MOT failure and safety risk. The vehicle may roll when parked on slopes, potentially causing accidents or damage. Depending on the cause, repair may involve cable adjustment (£50-£100), new cables (£150-£300), or rear brake renewal (£200-£400).
Independent garage
£80–£250
Specialist
£100–£300
Main dealer
£120–£400
Parts only
£30–£150
Major
Emissions failure (MK2 1.0T)
MK22017–20220k–60k miles
The 1.0 litre turbocharged engine in second-generation MG ZS models fails emissions tests at up to 28 times the national average rate. The failures occur across both manufacturer limits and default MOT limits, suggesting fundamental issues with the emissions control system rather than minor deterioration. Problems appear early in the vehicle's life, with failures recorded from very low mileages, and the trend is worsening year-on-year.
What happens if ignoredEmissions test failure results in immediate MOT failure until repaired. Common causes include catalyst failure, lambda sensor problems, or ECU software issues. Catalyst replacement typically costs £800-£1,500, while sensor replacement is £200-£400. Some issues may be resolved by software updates if available.
Independent garage
£200–£1,200
Specialist
£300–£1,500
Main dealer
£400–£2,000
Parts only
£150–£800

1 more known issues tracked

Including wear items, electrical niggles, and generation-specific problems. Check a specific car to see which issues apply to its age and mileage.

Check a specific car →

MOT failure hotspots

Based on DVSA MOT test data. These are the items where the MG Zs fails at a significantly higher rate than the average car.

Subframe bushes or mounts worn
Suspension · 40-60k miles
MOT failure rate: 44x the fleet average
Sample: 748 tests
ABS fault
Suspension · 150k+ miles
MOT failure rate: 43x the fleet average
Sample: 106 tests
Structural corrosion
Bodywork · 40-60k miles
MOT failure rate: 34x the fleet average
Sample: 763 tests
Suspension joint dust cover severely deteriorated
Suspension · 100-120k miles
MOT failure rate: 31x the fleet average
Sample: 255 tests
Emissions failure
Exhaust & Emissions · 20-40k miles
MOT failure rate: 28x the fleet average
Sample: 9,680 tests
Headlight fault
Lights & Electrics · 20-40k miles
MOT failure rate: 26x the fleet average
Sample: 29,660 tests

Buying a MG Zs?

Check a specific car's service history to see if it's been looked after — franchised dealer records with dates, mileage, and work done.

Check service history

£6.99 · Full refund if no records found

Related

MG Zs reliability FAQs

What are the most common problems with the MG Zs?

The MG Zs has 5 known issues across 3 severity levels. The most serious are: Structural corrosion around suspension mounting points (MK1).

Is the MG Zs reliable?

The MG Zs has 1 dangerous and 3 major known issues. Most can be avoided with a thorough pre-purchase check and full service history.

How much does it cost to fix MG Zs problems?

Repair costs range widely. The most significant issue (Structural corrosion around suspension mounting points (MK1)) costs £1,500–£3,500 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.

Which MG Zs generation is most reliable?

The MK2 (2017–2022) has the fewest dangerous issues (0). However, condition and service history matter more than generation — a well-maintained earlier car can be more reliable than a neglected newer one.