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

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 Zr?

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 Zr?

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 Zr vehicles have had dangerous defects recorded?

22% 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 Zr reliable?

Based on MOT data from 13,996 vehicles, the 2004 MG Zr has a first-time MOT pass rate of 70.9%, 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 Zr?

The most frequently recorded MOT issues on the 2004 MG Zr are: Nearside Front Tyre worn close to the legal limit (74.5% of vehicles), Offside Front Tyre worn close to the legal limit (67.8% of vehicles), Nearside Rear Tyre worn close to the legal limit (48.7% 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 Zr?

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.

CarHunch

Get Started

MG Zr (2004)

13,996 real MOT outcomes analysed • 70.9% first-time pass rate

2004 MG Zr

CarHunch analysed 13,996 real MOT records for the 2004 MG Zr. 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 Buyer's Checklist Pass Rate by Fuel Mileage Distribution Still on the Road MOT Averages Colour Breakdown Compare Models

The 2004 MG ZR's 70% first-time pass rate trails the UK average of 80%, and one in five of these cars (22.4%) have recorded a dangerous defect at some point—a genuine concern for a 20-year-old model. Petrol and diesel versions perform identically, so fuel choice won't help your odds here.

These ZRs are running at a relatively modest 52,800 miles median for their age, yet they're still averaging nearly 4 failures per test and over 11 advisories, suggesting mechanical fragility rather than just wear-and-tear neglect. Before committing to one, arrange a pre-purchase inspection focused on suspension, brakes, and cooling systems—the high advisory count points to chronic weak spots rather than one-off issues.

The 2004 MG Zr has a below-average first-time pass rate (70.9% 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

70.9%

UK average ~80%

Below average

Dangerous (ever)

22.4%

At least once in MOT history

Check this vehicle

Avg failures / car

3.82

Over 12.6 tests on record

High

Typical mileage

53k

Middle half: 42k–65k

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 11.6 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 13,996 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 13,996 vehicles — figures show how many had each issue flagged at least once in their MOT history.

Tyre wear 74.5%

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 34.8%

Front Brake pad(s) wearing thin · Parking brake lever has little reserve travel

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

Other issues 29%

Oil leak

Exhaust & emissions 22.5%

Exhaust emissions Lambda reading after 2nd fast idle outside specified limits · Exhaust has a minor leak of exhaust gases

Suspension & steering 20.4%

Nearside Front Track rod end ball joint has excessive play · Nearside Track rod end ball joint has excessive play

Harder to spot without a ramp — this is a good reason to book a pre-purchase inspection.

Wipers & washers 18.3%

Offside Windscreen wiper does not clear the windscreen effectively · Nearside Windscreen wiper does not clear the windscreen effectively

Lighting 17.1%

Offside 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 13,996 MG Zr cars.

Before you buy a 2004 MG Zr

Based on MOT data from 13,996 vehicles — here's what to check.

📋 Check the full MOT history. 22.4% 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 (92%)	12,852	70.9%	3.78
Diesel (8%)	1,125	70.1%	4.35

Colour Breakdown

Based on 53,975 MG Zr vehicles registered in the UK — across all years. From DVLA registration records.

Blue 28%

15,100

Grey 21.6%

11,649

Silver 14.7%

7,908

Red 12.7%

6,835

Yellow 8.4%

4,536

Black 7.9%

4,243

Green 6.4%

3,465

Orange 0.2%

White 0.1%

Turquoise 0.1%

Purple 0.1%

Gold 0%

Mileage Distribution

Most 2004 MG Zr 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.

52,812

typical

41,716

low mileage

65,213

high mileage

Half of all 2004 MG Zr vehicles fall between 41,716 and 65,213 miles.

Is the mileage you're seeing normal?

✓ Under 41,716 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.

✓ 41,716–65,213 miles — normal for age. This is where most 2004 MG Zrs sit.

⚠ Over 88,037 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 Zr — Still on the Road

Numbers are thinning — 6% of 2004 MG Zrs are still active.

Numbers are declining — 522 vehicles still getting MOTs in 2025 (6% 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

12.6

Avg MOT tests per vehicle

3.82

Avg failures per vehicle

11.6

Avg advisories per vehicle

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

2001 2002 2003 2005 2006

Or browse all models: MG →

Compare with another model

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

Buyer beware — pass it on