Porsche Cayenne (2021)

Estimated running costs and MOT pass rates from 4,115 MOT tests in 2024.

Annual Cost

£2,413

£201/month

MOT Pass Rate

95%

Excellent

Road Tax

£200

Standard rate/year

Est. Insurance

Grp 30-42

2995cc Petrol

Great Choice

95% pass rate, £2,413/year to run. 13 points above average.

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Petrol2995cc5 years old4,115 tests27k miles avg

Annual Running Costs

Fuel (Petrol, 2995cc)

~30 mpg

£1,958

Road Tax

Standard rate (from April 2017)

£200

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£2,413

Per month£201/mo

Per week£46/wk

Estimates based on 7,400 miles/year (UK average), petrol at 174.57p a litre (GOV.UK weekly average, week of 19 October 2026), GOV.UK road tax rates and repair likelihood from MOT data. Insurance not included. Cars registered from April 2017 pay the £200 standard rate, plus £440 a year for five years (from the second year) if they cost over £40,000 new (over £50,000 for electric cars).

Reliability Verdict

95% MOT pass rate(Excellent)

0%All-model avg: 82%100%

Excellent reliability. Very few MOT failures. That's 13 points above the average of 82% across all models in our data.

95% of MOT tests on Porsche Cayennes from 2021 ended in a pass in 2024, when they were about 3 years old. That's based on 4,115 tests across the UK, retests included. The average mileage recorded at those tests was 27,090 miles.

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How Does It Compare?

Rank among 2021 models720th of 3,336(top 22%)

Rank among Porsche models91st of 272(top half)

vs average of all models+13%(82% avg)

vs 2021 models average+3%(92% avg)

vs Porsche average+3%(92% avg)

Mileage Analysis

27,090

Average miles

22,200

Expected for age

The average 2021 Porsche Cayenne had 27,090 miles on the clock at its 2024 MOT, which is above the expected 22,200 miles for a 3-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.

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Best Year to Buy?

Of the years with at least 100 tests, the 2020 model has the highest MOT pass rate at 96%, while the 2007 model has the lowest at 83%. The 2021 scores 95%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.

Porsche Cayenne by Year

Year	Pass Rate	Tests	Avg Mileage
2022	96%	83	24,282 mi
2021	95%	4,115	27,090 mi
2020	96%	7,136	34,631 mi
2019	95%	9,063	40,685 mi
2018	93%	5,310	51,571 mi
2017	92%	4,856	65,047 mi
2016	92%	7,333	71,856 mi
2015	93%	6,258	79,263 mi
2014	91%	5,626	86,652 mi
2013	91%	6,261	96,482 mi
2012	89%	5,233	104,317 mi
2011	90%	3,069	107,653 mi
2010	89%	2,126	113,736 mi
2009	87%	1,955	119,837 mi
2008	86%	1,384	109,907 mi
2007	83%	1,790	115,755 mi
2006	86%	2,242	118,992 mi
2005	84%	2,951	124,592 mi
2004	84%	2,598	125,338 mi
2003	84%	1,257	121,522 mi

Similar Cars to Consider

BMW 5 Series

2019 · 2998cc Petrol

£2,413/year

92%

-3%

BMW X3

2019 · 2998cc Petrol

£2,413/year

92%

-3%

Mercedes GLC

2019 · 2996cc Petrol

£2,413/year

93%

-2%

BMW X5

2019 · 2998cc Petrol

£2,413/year

92%

-3%

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About the 2021 Porsche Cayenne

The 2021 Porsche Cayenne is a luxury car. Our records list a 2995cc petrol engine, though engines vary between versions. 4,115 MOT tests were recorded on this model in 2024, making it a reasonably common sight on UK roads. It ranks in the top 22% of all 2021 models for MOT pass rate.

With an average of 27,090 miles recorded at its 2024 MOT tests, Porsche Cayenne owners cover more miles than the average driver.

2021 Porsche Cayenne Fuel Costs

The 2995cc petrol engine is on the larger side, so fuel won't be this car's strong point. Expect around 30 mpg in mixed driving, which works out to roughly £1,958 per year with petrol at 174.57p per litre (GOV.UK weekly average, week of 19 October 2026; based on 7,400 miles per year).

What does it cost to own a 2021 Porsche Cayenne?

Total estimated annual running cost is £2,413 (£201/month), broken down as £1,958 fuel, £200 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 95% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

Porsche Cayenne Reliability Trend

Newer Porsche Cayennes pass their MOT more often than older ones, by 7 percentage points on average, which is mostly down to age and wear.

Buying a Used 2021 Porsche Cayenne

At 5 years old, the Porsche Cayenne offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. If you're flexible on year, the 2020 model has the highest pass rate at 96%.

Common Issues to Watch For

These are typical issues for cars of this age, fuel type and engine size, not faults recorded on this model's MOT tests. Use them as a checklist when you view one.

Oil Consumption

Low risk

Larger petrol engines can develop higher oil consumption as they age. Check the oil level and look for blue smoke from the exhaust.

Service History

Low risk

Always request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.

Running Costs Compared

How the 2021 Porsche Cayenne stacks up against similar cars for estimated annual running costs, insurance group, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Est. Ins. Group	Total/yr
Porsche Cayenne(2021)	95%	£1,958	£200	Grp 30-42	£2,413
BMW 5 Series(2019)	92%	£1,958	£200	Grp 30-42	£2,413same
BMW X3(2019)	92%	£1,958	£200	Grp 30-42	£2,413same
Mercedes GLC(2019)	93%	£1,958	£200	Grp 30-42	£2,413same
BMW X5(2019)	92%	£1,958	£200	Grp 30-42	£2,413same

Estimates based on 7,400 miles/year, GOV.UK average pump prices for the week of 19 October 2026, GOV.UK road tax rates and MOT data. Insurance groups are our rough estimate from engine size, not official groups. Actual costs vary by driver, location, and usage.

Questions about the 2021 Porsche Cayenne

Is the 2021 Porsche Cayenne reliable?

Excellent reliability. Very few MOT failures. 95% of MOT tests on 2021 Porsche Cayennes ended in a pass, from 4,115 tests (DVSA MOT data for tests in 2024, retests included). That's 13 points above the average of 82% across all models in the same data.

How much does a 2021 Porsche Cayenne cost to run?

Our estimate is £2,413 a year (£201 a month): £1,958 fuel, £200 road tax, £55 MOT and £200 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 2021 Porsche Cayenne?

95% of 4,115 MOT tests on the 2021 Porsche Cayenne ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 720th of 3,336 models first registered in 2021 (top 22%).

Which year Porsche Cayenne has the best MOT pass rate?

Of the years with at least 100 tests, the 2020 Porsche Cayenne has the highest MOT pass rate at 96% and the 2007 the lowest at 83%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 2021 Porsche Cayenne?

The average mileage recorded at MOT tests on the 2021 Porsche Cayenne is 27,090 miles, which is above the expected 22,200 miles for a 3-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.