Performance by cohort

3 year bands · 811,923 tests

Pass rate climbs 13.2 points across the cohorts — newer 3 Series examples clear the test more reliably than the early cars.

Pre-2018 cohort 763,858

Pass

78.0%

Fail

16.8%

PRS

4.5%

Avg mileage at test

112,913 mi

2018–2020 cohort 47,150

Pass

89.7%

Fail

8.4%

PRS

1.5%

Avg mileage at test

49,357 mi

2021+ cohort 915

Pass

91.2%

Fail

7.0%

PRS

1.9%

Avg mileage at test

28,831 mi

Cohort = vehicle's first-registration year band. Same model, different generations of build.

Generations on file · 3

BMW 3 Series · UK market

Photos: Wikimedia Commons · CC BY-SA / CC BY / public domain.

The picture

High mileage, high pass rate, hidden costs

76.32% first-time pass across 495,173 tests is a reasonable showing for a car that arrives at the MOT bay averaging 106,182 miles — among the highest in this class. Windscreen damage is the top failure (often chips left too long), with shock absorbers and tyre tread following. The 330d diesel attracted an EGR cooler recall that became notorious not for the fault itself but for the parts delays: some owners waited three weeks or more without a car while the dealer sat on a backorder. At this mileage, budget for suspension consumables and check the shock absorbers for leakage before committing. The MOT stats say it holds together; the owner reports say the diesel ancillaries are where the bills quietly accumulate.

ABI Insurance Group

Group 25–42

Above average — worth comparing quotes before buying. Lower groups cost less to insure; UK fleet average is around Group 22.

Source: ABI Group Rating Panel · administered by Thatcham Research · groups cover standard variants; performance trims may sit higher. Browse all insurance groups →

25–42

out of 50

Compare quotes →

Top ten reasons for rejection.

Filter failures:

Hide wear items to see the model's real defects.

01

Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view

24,779 occurrences · 3.1% of tests
02

Tyre tread depth not in accordance with the requirements

17,359 occurrences · 2.1% of tests
03

A shock absorber damaged to the extent that it does not function or showing signs of severe leakage

16,638 occurrences · 2.0% of tests
04

A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning

11,645 occurrences · 1.4% of tests
05

A tyre cords visible or damaged

11,046 occurrences · 1.4% of tests
06

A suspension pin, bush or joint excessively worn

9,656 occurrences · 1.2% of tests
07

Parking brake efficiency below minimum requirement

9,571 occurrences · 1.2% of tests
08

a brake lining or pad worn below 1.5mm

7,862 occurrences · 1.0% of tests
09

A rear registration plate lamp or light source missing or inoperative in the case of multiple lamps or light sources

7,829 occurrences · 1.0% of tests
10

A tyre seriously damaged

7,181 occurrences · 0.9% of tests

Counts cover Major and Dangerous defects logged at test. Advisory items excluded so this shows why a car was rejected, not just what the tester flagged in passing.

Worst-case fix budget · top 2 failures

£120–£190

If every one of this 3 Series's most-logged Major fails hit at the same MOT, that's the real-world UK garage range. Reality is usually one or two items, not all of them. Open the estimator →

Try the calculator

Build your own retest budget.

Year-band analysis

Best year to buy. Worst to avoid.

First-time MOT pass rate split by registration band. A 13.2-point gap between bands means the year you buy BMW 3 Series has a real effect on what turns up at the garage.

Best band to buy

91.2%

2021+ registration

the 2021-on band climbs to 91.2% — a 13.2-point improvement. Tests in this band average 28,831 miles — roughly 84K miles fewer on the clock than the older band. Failures here are mostly wear items: has ply or cords exposed, tread depth below requirements of 1.6mm — the structural issues that drag down older examples don't appear in the top-10 for this band. Post-2020 examples are early in their MOT life and generally show the cleanest records.

Band to be cautious about

78.0%

Pre-2018 registration

On the older band (pre-2018), the data shows a 78.0% pass rate against a fleet average of 91.2% on the newer band. The main culprits logged at test: damaged but not adversely affecting driver's view, tread depth below requirements of 1.6mm, and has a serious fluid leak. Average mileage on test for this band is 112,913 miles — high-mileage wear items are a recurring theme. Honest John records: "**05-02-2019:** Report of 43,000 mile BMW 330d Xdrive auto going in for a service and the EGR cooler recall check on 23-1-2019. A fault was found with the EGR and…"

Best band to buy: 2021+ (91.2% first-time pass). Worst band to avoid: pre-2018 (78.0% pass). That's a 13.2-point spread across 763,858 older tests and 915 newer ones — year of build makes a material difference on this model.

Year-spread leaderboard →

Tools that pre-empt a retest.

Picked against this car's top failure patterns. Affiliate links to Amazon UK — we earn a small cut at no cost to you. Disclosed up-front, doesn't shape the data.

Item 01 · Amazon UK

Digital tyre-tread depth gauge

Five quid for a gauge beats £150 for a retest. UK MOT minimum is 1.6mm — most testers fail anything below 2mm to be safe.

Search Amazon UK

My Motor World · affiliate

Parts & supplies for this fix

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Draper Expert

Draper Expert Oil Filter Socket for Audi, BMW, Mercedes-Benz, Porsche and VW

£18.69

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Click Mechanic · affiliate

Book a mobile mechanic

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Mobile mechanic · UK-wide

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Owner reports · Honest John

What owners actually report.

Verbatim faults logged by owners on honestjohn.co.uk over recent years. We didn't summarise — these are the words people typed in.

What's good

Brilliant to drive, powerful and fuel-efficient engines, good interior space and practicality.

Recent owner-reported faults

13 Feb 2019
Report of 2015 BMW 330D recalled to check the EGR Cooler. Dealer said it needed replacing and would take a couple of days to get parts. 3 weeks later it is still off the road and they have no idea of when the parts will be available.
30 Nov 2018
**05-02-2019:** Report of 43,000 mile BMW 330d Xdrive auto going in for a service and the EGR cooler recall check on 23-1-2019. A fault was found with the EGR and the car was retained by the dealer to avoid any liablility issues. Owner very annoyed to be put into a MINI loan car and then a Focus from Enterprise. No date given when the new EGR would arrive to repair the car.
20 Oct 2018
Report that due to the problem with the PHEV KLE Charge Control Units (16-7-2018 and 7-9-2017), production of BMW 330e models ceased in July 2018 and numerous are on sale at knock-down prices.
5 Oct 2018
Report of judder from drivetrain of 2015 BMW 320d XDrive, bought used at 32k miles from an independent. Judder and hasitation on acceleration in 3rd and 4th gear. It has been diagnosed as a faulty transmission box cost £3,600. Probably due to a disparity of more than 3mm between the tyres, or an odd set of tyres.
14 Sep 2018
Report of "resonance rattle" that appears to originate from somewhere in the upper steering column area of 2017 BMW 330E saloon on certain coarse road surfaces. After various tests, BMW dealers have not been able to pinpoint the cause of it. Something similar also reported in Mercedes C350e.
27 Aug 2018
Report of fault with a/c of 2016 BMW 320d x drive Sport Touring. When driving for about 2 hours the a/c ceases to emit cold air when set on a cold temperature setting. Even when the fan is turned on to full there is very little air flow from the vents even though owner can hear the fan roaring.
8 Aug 2018
Report of Engine Management Light coming on in 50k mile 2014 BMW 320d. Found that plastic inlet manifold has burnt through from inside.
16 Jul 2018
Further report of three failures of the KLE (Charge Control Unit) of an October 2016 BMW 330e PHEV over 21 months and 44,000 miles (see also 7-9-2017).
13 Jun 2018
Report of trim cracking around the stereo and climate control unit of an ex-demonstrator BMW 320d Sport Tourer purchased in March 2018. A product called 'Protect X' had apparently been applied.
13 Feb 2018
Report of transmission failure of 2013 BMW 320 automatic at 92,000 miles.
4 Jan 2018
Significant faults reported on 2016 BMW 335d bought as ex demo from BMW dealership. Major electrical issues with the car have resulted in it being in and out of the garage over the last seven weeks, but now fixed.
17 Oct 2017
Report of difficulty selecting 3rd and 4th in 2013 BMW 320d at 42,500 miles. BMW dealer wants to charge £170 to "diagnose" problem and if it is the DMF the dealer is quoting £3000 + to replace it. Difficult to make a case over a wear and tear item so recommended reader to see help from a BMW independent.

Source: honestjohn.co.uk · 30 reports indexed, top 12 shown

Recall history

66 UK recalls on record.

The 3 Series has 66 official UK vehicle recalls covering defect details, remedies, and affected build dates.

See all recalls

Buying or keeping a 3 Series?

Use the failure ranking as a pre-test checklist or a haggling lever. Treat the headline pass rate as a fleet-wide trend, not a guarantee on any individual car.

If you own a 3 Series and your last MOT looked nothing like the ranked failures above, that's normal — individual cars vary widely. The ranking shows the patterns testers flag most often across the country.