German Reliability: Myth or Reality? MOT Data vs the Hype

Everyone’s heard it: “German cars are built better.” They feel solid, drive brilliantly, and the marketing is… confident.

But there’s one moment every owner faces where brand perception meets reality: the MOT.

In our other MOT data studies, we’ve looked at the bigger patterns that affect all cars — not just one badge:

This time, we’re testing a claim that gets repeated constantly: are German premium cars actually more reliable than Japanese brands once they’re a few years old?

Using DVSA MOT results, we compared BMW, Audi and Mercedes-Benz against Lexus and Honda at around the 5-year mark — the "sweet spot" where cars have depreciated, but most buyers still expect them to be trouble-free.

Why the 5-year mark matters

The 5-year point is where reliability differences get expensive:

Many cars are out of the manufacturer warranty window.
Lease and PCP cars often re-enter the market at 3–5 years old, so this is the age band many used buyers shop in.
Wear items start to stack up, and any “weak points” in a platform begin to show.

It’s also an age where you can’t write failures off as “it’s just old” — a 5-year-old car failing on brakes, suspension, steering, or safety systems is a different story than a 15-year-old beater.

The headline result: German premium fails far more often

Here’s the MOT fail-rate picture at around 5 years old:

Brand	Tests Analysed	Fail Rate	Pass Rate	Fail Risk vs Lexus
Lexus	41,593	4.41%	95.59%	1.00×
Honda	171,188	5.78%	94.22%	1.31×
Audi	405,200	8.35%	91.65%	1.89×
BMW	505,874	9.16%	90.84%	2.08×
Mercedes-Benz	581,561	11.00%	89.00%	2.49×

A few takeaways jump out immediately:

Mercedes-Benz fails ~2.5× as often as Lexus at this age band.
BMW and Audi also underperform badly: roughly 2× Lexus.
The gap isn’t small. These are differences you feel in ownership: unexpected fails, retests, and parts bills.

Combined comparison (more stable than any one model)

To reduce “model mix” noise, we also looked at brand groups:

German premium (Audi + BMW + Mercedes-Benz): 9.66% fail rate across 1,492,635 tests
Japanese (Lexus + Honda): 5.51% fail rate across 212,781 tests

That’s a ~75% higher fail rate for German premium brands in this age bracket.

“It’s just tyres” doesn’t explain the gap

Tyres are the #1 MOT failure reason for almost every brand. That’s not controversial — and it’s often owner-maintenance rather than engineering.

So the key question is: when you strip out the obvious wear items, do German premium cars still look worse?

They do.

In our breakdown, we bucketed failures into:

Tyre-related
Brake wear
Major systems (suspension, steering, brake hardware, safety systems, etc.)
Minor maintenance (small fix items)

The “major systems” bucket is where the perception vs reality problem becomes sharp:

Lexus sits at 0.25% major-system-related failures in this analysis.
Mercedes-Benz sits at 7.43%.
Audi sits at 7.16%.

That’s roughly a 30× spread between Lexus and the worst German premium brand — and these aren’t cosmetic issues.

If you want the practical implication: a tyre fail is annoying; a suspension/brake/steering fail is costly.

What’s actually failing at 5 years old?

Across all five brands, tyre issues dominate — but German premium brands show meaningfully more failures in mechanical systems that typically cost real money to put right.

Here’s the pattern you should take seriously as a used buyer:

Tyres: common everywhere (and fixable), but still a frequent fail trigger.
Brakes: German premium brands show higher brake wear/hardware issues.
Suspension + parking brake + system warnings: these appear more often on German premium brands in this dataset — and these are the failures that surprise owners who assumed the badge guaranteed durability.

If you’re shopping used, this doesn’t mean “never buy German.” It means buy with your eyes open and check the model/year data, not the badge story.

Models that buck the trend (and the ones that don’t)

Brand averages are useful — but you don’t buy “a Mercedes,” you buy a specific model, year and variant.

Here are standout examples from this age-band analysis (all with meaningful sample sizes):

Segment	Model (Year)	Fail Rate	Tests
Best Japanese performers	Lexus RX (2020)	2.66%	1,877
	Honda Jazz Crosstar (2020)	2.22%	1,708
	Honda CR‑V (2020)	3.49%	5,767
Best German performers	Audi Q3 Sport 35 TFSI MHEV (2020)	3.30%	757
	Mercedes GLA 200 AMG Line (2020)	4.86%	2,305
Worst German performers	Mercedes Citan (2018)	19.68%	4,557
	Mercedes EQC (2020)	15.82%	550
	BMW 330e (2020)	13.99%	1,208

The big takeaway: model choice matters massively inside every brand — and electrified variants (PHEVs/early EVs) appear among some of the weaker performers in this snapshot.

How to use this data when buying a used car

If you want to turn this into a smarter buying decision, do it in this order:

Pick your age band first
Use the big-picture curve: How MOT fail rates change as cars age.
Shortlist models (not brands)
Start broad on Browse all vehicles, then drill down to model hubs.
Check the exact year you’re considering
Year pages show the pass rate, the sample size, and the most common failures — which is what you need for budgeting.
Read failure reasons like a mechanic, not a fan
Tyres and wipers are cheap. Suspension, brake hardware and corrosion are not.
If you’re still choosing between German vs Japanese
Combine this article with the suspension data: Pothole Pandemic: suspension failures by manufacturer.

Check your car’s MOT stats by number plate

Methodology & data sources

Data source: DVSA MOT test results (anonymised), processed into the Pre MOT Check database.
Study design: Brand comparison focused on vehicles taking an MOT at roughly ~5 years old.
Brands compared: Audi, BMW, Mercedes-Benz vs Lexus, Honda.
Metrics: Fail rate, pass rate, test volume; plus grouped failure “buckets” to separate wear items from major-system issues.

No dataset can control perfectly for mileage, driving style, or maintenance culture — but with hundreds of thousands of tests per German brand, the topline gap here is difficult to dismiss as noise.

Frequently Asked Questions

Are German cars reliable?

Based on our analysis of 1.7 million MOT tests at ~5 years old, German premium brands (BMW, Audi, Mercedes-Benz) have a 9.66% average fail rate compared to 5.51% for Japanese brands (Lexus, Honda). That's a 75% higher failure risk for German cars at this age.

Which is more reliable: German or Japanese cars?

Japanese brands show significantly better MOT reliability at 5 years old. Lexus has just a 4.41% fail rate and Honda 5.78%, compared to Audi (8.35%), BMW (9.16%), and Mercedes-Benz (11.00%). The gap widens further on major system failures.

What is the most reliable German car brand?

Among German premium brands at ~5 years old, Audi has the lowest fail rate at 8.35%, followed by BMW at 9.16%, and Mercedes-Benz at 11.00%. However, individual model choice matters more than brand – some German models outperform many Japanese alternatives.

Why do German cars fail MOT more often?

German premium cars show higher failure rates not just on tyres (which affects all brands) but on major systems like suspension, brakes and steering. Our data shows a ~30× gap between Lexus and the worst German brand on major-system failures specifically.

Key takeaways

At around 5 years old, German premium brands in this analysis fail MOTs ~75% more often than Lexus + Honda combined.
Mercedes-Benz is the clear outlier on the downside: ~2.5× Lexus fail risk in this snapshot.
Tyres matter everywhere, but the more concerning gap is in major-system failures (suspension/brakes/steering/safety).
The best strategy is to buy the right model/year, not the story around the badge.
Use Browse to compare shortlists — and use the year pages to see exactly what that car is most likely to fail on.

If you’re researching “German vs Japanese reliability” and want a single data-backed stat to cite:
In this 5-year age band analysis, German premium brands average a 9.66% fail rate vs 5.51% for Lexus + Honda.