What are the main MOT differences between BMW 1 Series and Audi A3?

The BMW 1 Series has a 18.7% overall MOT failure rate (366,703 tests) while the Audi A3 has 23.4% (1,827,593 tests). The top failure area for the BMW 1 Series is lamps & electrics, while for the Audi A3 it is lamps & electrics.

Should I buy a BMW 1 Series or Audi A3?

From an MOT reliability standpoint, the BMW 1 Series has a lower failure rate. However, MOT pass rates are just one factor — also consider insurance costs, fuel economy, running costs and personal preference. Use AutoSafe's free prediction tool to check a specific vehicle by registration.

BMW 1 Series vs Audi A3 — MOT Failure Rate Comparison

Q: Which is more reliable, BMW 1 Series or Audi A3?

Based on 2,194,296 MOT tests, the BMW 1 Series is more reliable with a 4.6 percentage point lower failure rate. The BMW 1 Series has a 18.7% failure rate while the Audi A3 has 23.4%.

BMW 1 Series

18.7%

failure rate from 366,703 tests

9.3pp below UK avg (28%)

Audi A3

23.4%

failure rate from 1,827,593 tests

4.6pp below UK avg (28%)

Verdict: The BMW 1 Series is more reliable based on MOT data, with a 4.6 percentage point lower failure rate than the Audi A3.

Failure Rate by Vehicle Age

How the BMW 1 Series and Audi A3 compare across different age groups:

Age	BMW 1 Series	Audi A3	Difference
0-2 years	9.4%	10.0%	BMW 1 Series +0.6pp
3-5 years	10.5%	10.6%	BMW 1 Series +0.1pp
6-10 years	20.2%	18.6%	Audi A3 +1.7pp
11-15 years	29.7%	35.3%	BMW 1 Series +5.6pp
15+ years	37.0%	43.1%	BMW 1 Series +6.2pp

Component Risk Comparison

Side-by-side breakdown of which MOT failure areas each model is weaker in:

BMW 1 Series Component Audi A3

3.4%

Lamps & Electrics

4.0%

3.2%

Tyres

3.5%

1.8%

Brakes

2.6%

1.8%

Suspension

3.9%

1.5%

Visibility

1.5%

0.3%

Body & Chassis

1.4%

0.2%

Steering

0.2%

Component	BMW 1 Series	Audi A3	Better
Lamps & Electrics	3.4%	4.0%	BMW 1 Series
Tyres	3.2%	3.5%	BMW 1 Series
Brakes	1.8%	2.6%	BMW 1 Series
Suspension	1.8%	3.9%	BMW 1 Series
Visibility	1.5%	1.5%	Equal
Body & Chassis	0.3%	1.4%	BMW 1 Series
Steering	0.2%	0.2%	BMW 1 Series

Which Is More Reliable: BMW 1 Series or Audi A3?

Based on official DVSA MOT test records covering 2,194,296 tests between these two models, the BMW 1 Series comes out ahead with a 4.6 percentage point lower overall failure rate. The BMW 1 Series fails 18.7% of the time compared to the Audi A3's 23.4%.

However, the gap between these models varies by vehicle age. Younger examples of both models tend to have more similar pass rates, while differences can become more pronounced as vehicles age and accumulate wear. Component-level data shows each model has different weak spots — the BMW 1 Series's top risk area is lamps & electrics while the Audi A3's is lamps & electrics. Knowing your model's specific weaknesses helps you target pre-MOT checks where they matter most.

Explore Each Model in Detail

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Data methodology: Failure rates are weighted averages across all mileage bands, calculated from official DVSA MOT test records. Only age/mileage combinations with 100+ tests are included. Component risks represent the probability of failure in each specific area. Data covers 142 million MOT tests across the UK. Comparisons are based on aggregate statistics and individual vehicle condition will vary.

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