Lexus GS430 (2003)

Estimated running costs and MOT pass rates from 84 MOT tests in 2024.

Annual Cost

£3,153

£263/month

MOT Pass Rate

83%

Good

Road Tax

£790

Estimated/year

Est. Insurance

Grp 35-50

4293cc Petrol

Solid Option

83% pass rate, £3,153/year to run. Close to the average across all models.

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Petrol4293cc23 years old84 tests114k miles avg

Annual Running Costs

Fuel (Petrol, 4293cc)

~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

83% 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 Lexus brand average of 87%.

83% of MOT tests on Lexus GS430s from 2003 ended in a pass in 2024, when they were about 21 years old. That's based on 84 tests across the UK, retests included. The average mileage recorded at those tests was 113,842 miles.

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How Does It Compare?

Rank among 2003 models68th of 429(top 16%)

Rank among Lexus models201st of 298(bottom half)

vs average of all models+1%(82% avg)

vs 2003 models average+11%(72% avg)

vs Lexus average-4%(87% avg)

Mileage Analysis

113,842

Average miles

155,400

Expected for age

The average 2003 Lexus GS430 had 113,842 miles on the clock at its 2024 MOT, which is below the expected 155,400 miles for a 21-year-old car. This suggests lighter use than average, which generally means less wear on major components.

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Lexus GS430 by Year

Year	Pass Rate	Tests	Avg Mileage
2006	79%	34	114,262 mi
2005	84%	241	119,536 mi
2003	83%	84	113,842 mi
2002	82%	83	117,306 mi
2001	91%	99	123,832 mi

Similar Cars to Consider

Land Rover Range Rover Sport

2005 · 4394cc Petrol

£3,153/year

82%

-1%

Porsche 911

2005 · 3824cc Petrol

£3,003/year

90%

+7%

Land Rover Range Rover

2003 · 3950cc Petrol

£3,303/year

77%

-6%

Rover 75

2004 · 4601cc Petrol

£3,503/year

69%

-14%

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About the 2003 Lexus GS430

The 2003 Lexus GS430 is a premium performance car. Our records list a 4293cc petrol engine, though engines vary between versions. 84 MOT tests were recorded on this model in 2024, making it a rare model on UK roads. It ranks in the top 16% of all 2003 models for MOT pass rate.

With an average of 113,842 miles recorded at its 2024 MOT tests, Lexus GS430 owners tend to use this car less than the typical driver.

2003 Lexus GS430 Fuel Costs

The 4293cc 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 2003 Lexus GS430?

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 83% pass rate. Keeping on top of servicing will help avoid surprises.

Buying a Used 2003 Lexus GS430

At 23 years old, the Lexus GS430 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. Note: with only 84 tests in our data, these figures should be treated as indicative rather than definitive.

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 23 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.

Clutch Wear

Watch out

With an average of 114k miles, clutch replacement may be due (typical lifespan 60,000-100,000 miles). Budget £400-£800 for a new clutch kit.

Brake Discs and Pads

Medium risk

High-mileage cars often need brake disc replacement, not just pads. A full set of discs and pads costs £200-£500 per axle.

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 2003 Lexus GS430 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
Lexus GS430(2003)	83%	£1,958	£790	Grp 35-50	£3,153
Land Rover Range Rover Sport(2005)	82%	£1,958	£790	Grp 35-50	£3,153same
Porsche 911(2005)	90%	£1,958	£790	Grp 35-50	£3,003-£150
Land Rover Range Rover(2003)	77%	£1,958	£790	Grp 35-50	£3,303+£150
Rover 75(2004)	69%	£1,958	£790	Grp 35-50	£3,503+£350

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 2003 Lexus GS430

Is the 2003 Lexus GS430 reliable?

Good reliability. Occasional issues but generally solid. 83% of MOT tests on 2003 Lexus GS430s ended in a pass, from 84 tests (DVSA MOT data for tests in 2024, retests included). That's 1 point above the average of 82% across all models in the same data.

How much does a 2003 Lexus GS430 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 2003 Lexus GS430?

83% of 84 MOT tests on the 2003 Lexus GS430 ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 68th of 429 models first registered in 2003 (top 16%).

What is the average mileage for a 2003 Lexus GS430?

The average mileage recorded at MOT tests on the 2003 Lexus GS430 is 113,842 miles, which is below the expected 155,400 miles for a 21-year-old car. This suggests lighter use than average, which generally means less wear on major components.