The picture
Rs4: above-average pass rates, with caveats
Across 1,287 MOT tests, the Rs4 returns 83.7% first-time pass — above the UK fleet average. The single most-logged Major fail is a torn suspension dust cover. Windscreen damage and a missing CV-joint boot round out the top three. Average tested mileage sits at 84,671, which is the lens to read those failure rankings through. If you own one and the next test is close, the ranked list below is a sensible pre-test checklist.
Top ten reasons for rejection.
- 01
A suspension joint dust cover severely deteriorated
59 occurrences · 4.6% of tests
- 02
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
36 occurrences · 2.8% of tests
- 03
A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc
30 occurrences · 2.3% of tests
- 04
A rear registration plate lamp or light source missing or inoperative in the case of multiple lamps or light sources
28 occurrences · 2.2% of tests
- 05
A tyre cords visible or damaged
27 occurrences · 2.1% of tests
- 06
Tyre tread depth not in accordance with the requirements
26 occurrences · 2.0% of tests
- 07
A transmission shaft constant velocity joint boot severely deteriorated
23 occurrences · 1.8% of tests
- 08
A spring or spring component fractured or seriously weakened
16 occurrences · 1.2% of tests
- 09
A suspension joint dust cover missing or no longer prevents the ingress of dirt etc
16 occurrences · 1.2% of tests
- 10
A suspension pin, bush or joint excessively worn
14 occurrences · 1.1% 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 3 failures
£148–£370
If every one of this Rs4'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.
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
H7 / W21W bulb pack
A spare-bulb kit lives in the boot. Test morning is not the time to find your stop-lamp's gone.
Search Amazon UK
Item 02 · 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
Buying or keeping a Rs4?
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 Rs4 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.