Should I check the MOT history before buying a 2021 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 2021 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 2021 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.

Is the 2021 BMW Z4 reliable?

Based on MOT data from 1,001 vehicles, the 2021 BMW Z4 has a first-time MOT pass rate of 94.2%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

What are common problems with the 2021 BMW Z4?

The most frequently recorded MOT issues on the 2021 BMW Z4 are: Offside Rear Tyre worn close to legal limit/worn on edge (22.2% of vehicles), Nearside Rear Tyre worn close to legal limit/worn on edge (21.4% of vehicles), Offside Front Tyre worn close to legal limit/worn on edge (13.3% 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 2021 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 (2021)

1,001 real MOT outcomes analysed • 94.2% first-time pass rate

2021 BMW Z4

CarHunch analysed 1,001 real MOT records for the 2021 BMW Z4. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
Which year to buy? →

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AI Analysis Reliability Overview Common Issues Check a Specific Reg Buyer's Checklist Mileage Distribution Still on the Road MOT Averages Colour Breakdown Compare Models

The 2021 BMW Z4 is significantly more reliable than the UK average, with a 94.2% first-time MOT pass rate versus the national 80%, and only 9.4% of vehicles ever recording a dangerous defect—well below the threshold for concern. This is a genuinely strong result that suggests BMW's engineering and build quality are holding up well in the real world.

At just under 19,000 miles median mileage, these Z4s are still relatively lightly used, which partly explains the excellent pass rate, but the real indicator is the low failure count of just 0.2 per vehicle on average. When you do buy one, budget for routine advisory items (averaging 1.2 per test), but this model is unlikely to surprise you with costly structural or safety issues—just get a pre-purchase inspection focused on the suspension and brakes, which typically drive those advisories.

The 2021 BMW Z4 passes its MOT first time more often than most UK vehicles (94.2% vs ~80% average) — and when it does fail, it's usually something minor and cheap to fix.

⚠️ About 1 in 12 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

94.2%

UK average ~80%

Better than average

Dangerous (ever)

9.4%

At least once in MOT history

Check this vehicle

Avg failures / car

0.2

Over 2.5 tests on record

Low

Typical mileage

19k

Middle half: 13k–26k

For context

✅ Good baseline reliability. A 94.2% first-time pass rate puts this well above the UK average — it's a well-sorted vehicle in this age bracket.

🔍 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 1,001 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.

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What tends to go wrong

Across 1,001 vehicles — figures show how many had each issue flagged at least once in their MOT history.

Tyre wear 22.2%

Offside Rear Tyre worn close to legal limit/worn on edge · Nearside Rear Tyre worn close to legal limit/worn on edge · Offside Front Tyre worn close to legal limit/worn on edge · …

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

Lighting 4.1%

Nearside Front Road wheel slightly distorted

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

Data covers a 3-year window centred on 2021.

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 1,001 BMW Z4 cars.

Before you buy a 2021 BMW Z4

Based on MOT data from 1,001 vehicles — here's what to check.

📋 Check the full MOT history. 9.4% 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

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 2021 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.

18,913

typical

13,425

low mileage

26,294

high mileage

Half of all 2021 BMW Z4 vehicles fall between 13,425 and 26,294 miles.

Is the mileage you're seeing normal?

✓ Under 13,425 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.

✓ 13,425–26,294 miles — normal for age. This is where most 2021 BMW Z4s sit.

⚠ Over 35,496 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2021 BMW Z4 — Still on the Road

Almost all 2021 BMW Z4s are still on the road.

Strong survival — 980 vehicles still getting MOTs in 2025, 100% of the peak.

Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2023–2025.

MOT History Averages

2.5

Avg MOT tests per vehicle

0.2

Avg failures per vehicle

1.2

Avg advisories per vehicle

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

2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2019 2020 2022

Or browse all models: BMW →

Compare with another model

See how the 2021 BMW Z4 stacks up against a rival.

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