Should I check the MOT history before buying a 2004 BMW Z4?

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 BMW Z4?

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 BMW Z4?

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 BMW Z4 vehicles have had dangerous defects recorded?

42% 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 BMW Z4 reliable?

Based on MOT data from 4,836 vehicles, the 2004 BMW Z4 has a first-time MOT pass rate of 77.4%, 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 BMW Z4?

The most frequently recorded MOT issues on the 2004 BMW Z4 are: Nearside Rear Tyre worn close to the legal limit (84% of vehicles), Offside Rear Tyre worn close to the legal limit (81.7% of vehicles), Oil leak, but not excessive (64.6% 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 BMW Z4?

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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BMW Z4 (2004)

4,836 real MOT outcomes analysed • 77.4% first-time pass rate

2004 BMW Z4

CarHunch analysed 4,836 real MOT records for the 2004 BMW Z4. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
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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 BMW Z4's first-time pass rate of 77.3% trails the UK average by nearly 3 percentage points, which is a minor concern — but the 41.7% of cars that have suffered dangerous defects at some point is a serious red flag for any potential buyer. This roadster's reliability profile is notably worse than its peers, suggesting structural or safety-critical issues are commonplace in this generation.

These Z4s are averaging 67,614 miles, which is reasonable for a 20-year-old car, but the high failure count of 4.9 per vehicle and especially the 28 advisories per car indicate widespread wear across multiple systems. Before purchasing, have a pre-buy inspection focus on suspension, braking components, and electrical systems — the advisory volume suggests these cars need continuous attention to stay safe and roadworthy.

The 2004 BMW Z4 has a decent first-time pass rate (77.4%), but a higher-than-average share of vehicles have had serious defects recorded — the individual vehicle's history matters a lot here.

⚠️ 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

77.4%

UK average ~80%

Around average

Dangerous (ever)

41.7%

At least once in MOT history

Check this vehicle

Avg failures / car

4.9

Over 20.6 tests on record

High

Typical mileage

67k

Middle half: 50k–83k

For context

🔧 Average reliability. Passes at roughly the UK rate — not a standout, not a problem vehicle. Individual history makes all the difference.

🔧 Expect consumable spend. An average of 28 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 4,836 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.

Watch for defects — worth knowing

What tends to go wrong

Across 4,836 vehicles — figures show how many had each issue flagged at least once in their MOT history.

Tyre wear 84%

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

Other issues 64.6%

Oil leak, but not excessive · Under-trays fitted obscuring some underside components · Engine covers fitted obscuring some components in the engine bay

Brake wear 51.6%

Nearside Rear Brake pipe corroded, covered in grease or other material · Front Brake pad(s) wearing thin · Offside Rear Brake pipe corroded, covered in grease or other material · …

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

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 4,836 BMW Z4 cars.

Before you buy a 2004 BMW Z4

Based on MOT data from 4,836 vehicles — here's what to check.

📋 Check the full MOT history. 41.7% 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 (100%)	4,828	77.4%	4.9

Colour Breakdown

Based on 44,746 BMW Z4 vehicles registered in the UK — across all years. From DVLA registration records.

Black 27.9%

12,462

Grey 20.1%

9,007

Blue 17%

7,598

Silver 13%

5,796

White 12.1%

5,392

Red 7.3%

3,268

Orange 1.1%

499

Brown 0.7%

297

Yellow 0.5%

214

Green 0.3%

145

Purple 0.1%

Bronze 0.1%

Mileage Distribution

Most 2004 BMW Z4 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.

66,609

typical

50,412

low mileage

83,317

high mileage

Half of all 2004 BMW Z4 vehicles fall between 50,412 and 83,317 miles.

Is the mileage you're seeing normal?

✓ Under 50,412 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.

✓ 50,412–83,317 miles — normal for age. This is where most 2004 BMW Z4s sit.

⚠ Over 112,477 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2004 BMW Z4 — Still on the Road

Numbers are thinning — 65% of 2004 BMW Z4s are still active.

2,761 vehicles still getting MOTs in 2025 — 65% of the peak remain.

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

20.6

Avg MOT tests per vehicle

4.9

Avg failures per vehicle

Avg advisories per vehicle

Other model years — BMW Z4: All Z4 years → Which year to buy? →

2003 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2019 2020 2021 2022

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See how the 2004 BMW Z4 stacks up against a rival.

Watch for defects — worth knowing