Should I check the MOT history before buying a 2004 MG Zs?

Yes. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. A full MOT history analysis will highlight patterns that a single test result won't reveal.

What corrosion should I look for when inspecting a 2004 MG Zs?

Check brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that is expensive to fix and can fail an MOT.

How are tyres and brakes typically on a 2004 MG Zs?

Tyres and brakes are the most common advisory items on vehicles of this age. Budget for replacement if they are near the limit, and factor this into your offer price.

How many 2004 MG Zs vehicles have had dangerous defects recorded?

25% of these vehicles have had a dangerous defect recorded. Search the registration on CarHunch — the full MOT history will show exactly what was flagged and whether it was resolved.

Is the 2004 MG Zs reliable?

Based on MOT data from 4,437 vehicles, the 2004 MG Zs has a first-time MOT pass rate of 72.5%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

What are common problems with the 2004 MG Zs?

The most frequently recorded MOT issues on the 2004 MG Zs are: Nearside Front Tyre worn close to the legal limit (73.9% of vehicles), Offside Front Tyre worn close to the legal limit (70.7% of vehicles), Nearside Rear Tyre worn close to the legal limit (61.4% of vehicles). These figures are based on actual MOT test records — search a specific registration on CarHunch to see its individual history.

Do I need an HPI check when buying a 2004 MG Zs?

Yes. The MOT history will not show outstanding finance, insurance write-offs, or stolen status. An HPI check covers these areas and should be part of any used car purchase.

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MG Zs (2004)

4,437 real MOT outcomes analysed • 72.5% first-time pass rate

2004 MG Zs

CarHunch analysed 4,437 real MOT records for the 2004 MG Zs. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
Which year to buy? →

On this page

AI Analysis Reliability Overview Common Issues Check a Specific Reg Petrol vs Diesel Buyer's Checklist Pass Rate by Fuel Mileage Distribution Still on the Road MOT Averages Colour Breakdown Compare Models

The 2004 MG ZS has a 71.6% first-time pass rate, notably below the UK average of 80%, and that gap widens when you learn that a quarter of these cars (25.2%) have recorded dangerous defects—a serious red flag for any prospective buyer. Petrol and diesel versions perform almost identically, both struggling in the low 70s, so fuel type won't solve the reliability puzzle here.

At 56,000 miles median, these cars aren't unusually high-mileage for their age, yet they're accumulating 3.8 failures and 15 advisories on average per MOT, pointing to systemic wear and poor build quality rather than just heavy use. Before buying one, get a full pre-purchase inspection focusing on suspension, braking, and electrical systems—the high advisory count suggests these are the persistent problem areas.

The 2004 MG Zs has a below-average first-time pass rate (72.5% vs ~80% UK average) — check the specific vehicle's full MOT history carefully before buying.

⚠️ Over 1 in 5 of these vehicles have had a dangerous MOT failure at some point — usually tyres or brakes, and often a one-off issue rather than a persistent problem. The group stats won't tell you which one you're looking at.

First-time pass

72.5%

UK average ~80%

Below average

Dangerous (ever)

25.2%

At least once in MOT history

Check this vehicle

Avg failures / car

3.79

Over 13.1 tests on record

High

Typical mileage

56k

Middle half: 43k–69k

For context

⚠️ Below average. More vehicles in this cohort fail their first MOT than typical. Scrutinise this vehicle's history — look for recurring issues, not just the latest result.

🔧 Expect consumable spend. An average of 15.1 advisories per vehicle tells you wear items (tyres, brakes) get flagged regularly. Budget for them — they're not surprises.

🔍 The dangerous defect figure is real. Most are one-off tyre failures or brake issues — not structural problems. But it's exactly why checking the individual vehicle's history is essential, not optional.

These stats describe 4,437 vehicles as a group. The specific vehicle you're looking at could be the one good example or the one outlier. Run its registration to find out.

Buyer beware — pass it on

What tends to go wrong

Across 4,437 vehicles — figures show how many had each issue flagged at least once in their MOT history.

Tyre wear 73.9%

Nearside Front Tyre worn close to the legal limit · Offside Front Tyre worn close to the legal limit · Nearside Rear Tyre worn close to the legal limit · …

Budget for a full set — on a vehicle this age, tyres are expected consumables. An inspection will confirm how much is left.

Brake wear 32.3%

Front Brake pad(s) wearing thin · Parking brake: efficiency below requirements · Front brake disc worn, pitted or scored, but not seriously weakened

Ask the seller when brakes were last serviced. If they don't know, factor in the cost.

Other issues 25.1%

Oil leak · Child seat fitted not allowing full inspection of adult belt · Horn not working

Lighting 18.9%

Offside Stop lamp not working · Supplementary Restraint System warning lamp indicates a fault · Nearside Stop lamp not working

Usually cheap to fix. Worth confirming all lights work before collecting.

Data covers a 3-year window centred on 2004.

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 4,437 MG Zs cars.

Petrol vs Diesel

Pass rate difference of 2 percentage points — worth knowing if you're choosing between the two.

72.8%

Petrol

3,915 vehicles

70.8%

Diesel

507 vehicles

Before you buy a 2004 MG Zs

Based on MOT data from 4,437 vehicles — here's what to check.

📋 Check the full MOT history. 25.2% of these vehicles have had a dangerous defect recorded - recurring advisories often signal problems years before they become failures.
Search the reg on CarHunch for the full MOT history, reliability stats and a free AI-powered analysis of that exact vehicle.
🔍 Brake pipes, sills and subframes are the key areas on a vehicle this age — structural rust is hard to spot without getting underneath. A mechanic will check all of this before you commit, and give you a concrete basis to negotiate on price. Inspection →
📄 Outstanding finance, insurance write-offs and clocking won't appear in the MOT records — a dedicated history check covers all of this. Our link gets you 20% off automatically. History Get 20% off via CarHunch

Pass Rate by Fuel Type

Fuel type	Vehicles	Pass rate	Avg failures
Petrol (88%)	3,915	72.8%	3.75
Diesel (11%)	507	70.8%	4.15

Colour Breakdown

Based on 38,683 MG Zs vehicles registered in the UK — across all years. From DVLA registration records.

Blue 26.7%

10,339

Red 16.9%

6,551

Silver 13%

5,028

White 11.9%

4,615

Grey 11.6%

4,470

Black 10.4%

4,019

Green 5.1%

1,962

Orange 2.5%

951

Yellow 1.9%

737

Turquoise 0%

Purple 0%

Mileage Distribution

Most 2004 MG Zs vehicles sit in the blue band. If the vehicle you're looking at is outside it, it's either unusually low or high mileage for its age.

55,975

typical

43,189

low mileage

69,493

high mileage

Half of all 2004 MG Zs vehicles fall between 43,189 and 69,493 miles.

Is the mileage you're seeing normal?

✓ Under 43,189 miles — lower than most. Could be great, or could be a vehicle that rarely moved. Check test frequency and mileage progression in the MOT history.

✓ 43,189–69,493 miles — normal for age. This is where most 2004 MG Zss sit.

⚠ Over 93,815 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2004 MG Zs — Still on the Road

Numbers are thinning — 10% of 2004 MG Zss are still active.

Numbers are declining — 294 vehicles still getting MOTs in 2025 (10% of peak).

Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2014–2025.
* The 2020 dip reflects the government's COVID-19 MOT exemption, which allowed certificates to be extended by six months — fewer tests were conducted that year.

MOT History Averages

13.1

Avg MOT tests per vehicle

3.79

Avg failures per vehicle

15.1

Avg advisories per vehicle

Other model years — MG Zs: All Zs years → Which year to buy? →

2001 2002 2003 2005 2006 2017 2018 2019 2020

Or browse all models: MG →

Compare with another model

See how the 2004 MG Zs stacks up against a rival.

Buyer beware — pass it on