Porsche Boxster (2005)

Estimated running costs and MOT pass rates from 6,992 MOT tests in 2024.

Annual Cost

£3,153

£263/month

MOT Pass Rate

86%

Good

Road Tax

£790

Estimated/year

Est. Insurance

Grp 35-50

3197cc Petrol

Solid Option

86% pass rate, £3,153/year to run. Close to the average across all models.

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Petrol3197cc21 years old6,992 tests78k miles avg

Annual Running Costs

Fuel (Petrol, 3197cc)

~30 mpg

£1,958

Road Tax

Estimated CO2 band

£790

MOT Test

£55

Predicted Repairs

£350

Total per year£3,153

Per month£263/mo

Per week£61/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.

Reliability Verdict

86% MOT pass rate(Good)

0%All-model avg: 82%100%

Good reliability. Occasional issues but generally solid. That's close to the average of 82% across all models in our data. It falls below the Porsche brand average of 92%.

86% of MOT tests on Porsche Boxsters from 2005 ended in a pass in 2024, when they were about 19 years old. That's based on 6,992 tests across the UK, retests included. The average mileage recorded at those tests was 78,175 miles.

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How Does It Compare?

Rank among 2005 models69th of 504(top 14%)

Rank among Porsche models225th of 272(bottom 18%)

vs average of all models+4%(82% avg)

vs 2005 models average+14%(72% avg)

vs Porsche average-6%(92% avg)

Mileage Analysis

78,175

Average miles

140,600

Expected for age

The average 2005 Porsche Boxster had 78,175 miles on the clock at its 2024 MOT, which is below the expected 140,600 miles for a 19-year-old car. This suggests lighter use than average, which generally means less wear on major components.

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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 98%, while the 1998 model has the lowest at 78%. The 2005 scores 86%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.

Porsche Boxster by Year

Year	Pass Rate	Tests	Avg Mileage
2021	98%	727	12,725 mi
2020	98%	1,370	17,722 mi
2019	97%	2,672	21,404 mi
2018	96%	3,007	26,673 mi
2017	96%	2,767	31,373 mi
2016	95%	3,210	32,910 mi
2015	97%	2,716	32,812 mi
2014	94%	2,726	42,302 mi
2013	94%	3,111	45,989 mi
2012	94%	2,582	49,604 mi
2011	92%	1,483	50,786 mi
2010	93%	1,750	54,631 mi
2009	94%	1,731	61,617 mi
2008	92%	2,287	64,082 mi
2007	89%	3,485	72,004 mi
2006	88%	4,150	78,168 mi
2005	86%	6,992	78,175 mi
2004	83%	4,066	80,783 mi
2003	82%	5,008	83,796 mi
2002	82%	4,350	87,053 mi
2001	83%	4,134	86,615 mi
2000	82%	3,688	89,426 mi
1999	81%	3,058	94,996 mi
1998	78%	2,493	94,009 mi
1997	83%	1,352	93,558 mi
1996	77%	43	110,547 mi

Similar Cars to Consider

Land Rover Freelander

2007 · 3192cc Petrol

£3,303/year

75%

-11%

Saab 9-3

2007 · 2792cc Petrol

£2,958/year

76%

-10%

Mercedes E

2004 · 3199cc Petrol

£3,303/year

78%

-8%

Mercedes CLK

2007 · 2997cc Petrol

£2,958/year

76%

-10%

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About the 2005 Porsche Boxster

The 2005 Porsche Boxster is a luxury car. Our records list a 3197cc petrol engine, though engines vary between versions. 6,992 MOT tests were recorded on this model in 2024, making it a reasonably common sight on UK roads. It ranks in the top 14% of all 2005 models for MOT pass rate.

With an average of 78,175 miles recorded at its 2024 MOT tests, Porsche Boxster owners tend to use this car less than the typical driver.

2005 Porsche Boxster Fuel Costs

The 3197cc 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 2005 Porsche Boxster?

Total estimated annual running cost is £3,153 (£263/month), broken down as £1,958 fuel, £790 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 86% pass rate. Keeping on top of servicing will help avoid surprises.

Porsche Boxster Reliability Trend

Newer Porsche Boxsters pass their MOT more often than older ones, by 11 percentage points on average, which is mostly down to age and wear.

Buying a Used 2005 Porsche Boxster

At 21 years old, the Porsche Boxster is firmly in budget territory. Purchase prices are low, but check for rust, worn suspension bushes, and electrical gremlins. A full service history is especially valuable at this age. If you're flexible on year, the 2020 model has the highest pass rate at 98%. With 6,992 MOT tests in our data, there's strong statistical confidence in these figures.

What the 2005 Porsche Boxster Fails Its MOT On

Share of the 643 MOT tests on the 2005 Porsche Boxster that failed at the first attempt in 2025, next to all cars and vans of the same age.

Lights and electrics34%
Same age: 50% (fails on this less often)
Exhaust, emissions and leaks25%
Same age: 16% (fails on this more often)
Brakes25%
Same age: 30%
Suspension24%
Same age: 40% (fails on this less often)

DVSA anonymised MOT data for 2025; a test that failed on two areas counts in both. How we count it · Porsche Boxster reliability, common problems and years to avoid

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.

Timing Chain / Belt

Watch out

At 21 years old, check whether the timing belt has been replaced (typically due every 5-7 years or 60,000-100,000 miles). A snapped belt can destroy the engine.

Oil Consumption

Medium risk

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

Rust and Corrosion

Watch out

At 10+ years, check wheel arches, sills, subframe, and brake lines for rust. Structural corrosion is an MOT failure. Prevention is far cheaper than repair.

Suspension Bushings

Watch out

Rubber suspension bushes harden and crack with age, causing knocking noises and vague handling. A full refresh costs £300-£800 depending on the car.

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 2005 Porsche Boxster 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 Boxster(2005)	86%	£1,958	£790	Grp 35-50	£3,153
Land Rover Freelander(2007)	75%	£1,958	£790	Grp 35-50	£3,303+£150
Saab 9-3(2007)	76%	£1,958	£445	Grp 30-42	£2,958-£195
Mercedes E(2004)	78%	£1,958	£790	Grp 35-50	£3,303+£150
Mercedes CLK(2007)	76%	£1,958	£445	Grp 30-42	£2,958-£195

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 2005 Porsche Boxster

Is the 2005 Porsche Boxster reliable?

Good reliability. Occasional issues but generally solid. 86% of MOT tests on 2005 Porsche Boxsters ended in a pass, from 6,992 tests (DVSA MOT data for tests in 2024, retests included). That's 4 points above the average of 82% across all models in the same data.

How much does a 2005 Porsche Boxster cost to run?

Our estimate is £3,153 a year (£263 a month): £1,958 fuel, £790 road tax, £55 MOT and £350 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 2005 Porsche Boxster?

86% of 6,992 MOT tests on the 2005 Porsche Boxster ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 69th of 504 models first registered in 2005 (top 14%).

Which year Porsche Boxster has the best MOT pass rate?

Of the years with at least 100 tests, the 2020 Porsche Boxster has the highest MOT pass rate at 98% and the 1998 the lowest at 78%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 2005 Porsche Boxster?

The average mileage recorded at MOT tests on the 2005 Porsche Boxster is 78,175 miles, which is below the expected 140,600 miles for a 19-year-old car. This suggests lighter use than average, which generally means less wear on major components.