Is the 2018 JAGUAR XJ reliable?

Excellent reliability. Very few MOT failures. 93% of JAGUAR XJs from 2018 passed their MOT first time in 2026, based on 1,682 tests. That's 11 points above the national average of 82%.

How much does a 2018 JAGUAR XJ cost to run?

Estimated annual running cost is £1,695 (£141/month), including £1245 fuel, £195 road tax, £55 MOT, and £200 predicted repairs.

What is the MOT pass rate for a 2018 JAGUAR XJ?

The 2018 JAGUAR XJ has a 93% MOT pass rate based on 1,682 tests in 2026. This ranks 184 out of 649 cars from 2018.

Which year JAGUAR XJ is most reliable?

The 2019 JAGUAR XJ has the highest MOT pass rate at 94%. The least reliable year is 2002 at 77%.

JAGUAR XJ (2018)

Q: What is the average mileage for a 2018 JAGUAR XJ?

The average mileage for a 2018 JAGUAR XJ is 44,709 miles, which is below the expected 59,200 miles for a 8-year-old car. This suggests lighter use than average, which generally means less wear on major components.

Running costs, reliability data, and common problems from 1,682 real MOT tests.

Annual Cost

£1,695

£141/month

MOT Pass Rate

93%

Excellent

Road Tax

£195

Flat rate/year

Insurance

Grp 30-42

2993cc Diesel

Great Choice

93% pass rate, £1695/year to run. 11 points above average.

Buying this car? Check for finance, write-offs & theft

£4.99

Check a specific JAGUAR XJ

Enter a reg plate for full MOT history, mileage check, health score, running costs, and reliability data. Free, instant, no signup.

Diesel2993cc8 years old1,682 tests45k miles avg

Annual Running Costs

Fuel (Diesel, 2993cc)

~40 mpg

£1,245

Road Tax

Flat rate (post-2017)

£195

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£1,695

Per month£141/mo

Per week£33/wk

Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.

🛡️

Get an insurance quote for this JAGUAR XJ

Compare quotes and find the best deal

Reliability Verdict

93% MOT pass rate(Excellent)

0%National avg: 82%100%

Excellent reliability. Very few MOT failures. That's 11 points above the national average of 82%. It also outperforms the JAGUAR brand average of 88%.

At 8 years old, 93% of JAGUAR XJs from 2018 passed their MOT first time in 2026. That's based on 1,682 tests across the UK. The average mileage at this age is 44,709 miles.

Got a JAGUAR XJ you're looking at?

Enter the reg plate to check its specific MOT history, mileage, and health score.

How Does It Compare?

Rank among 2018 cars184th of 649(top 28%)

Rank among JAGUAR models90th of 299(top 30%)

vs national average+11%(82% avg)

vs 2018 cars average+4%(89% avg)

vs JAGUAR average+5%(88% avg)

Mileage Analysis

44,709

Average miles

59,200

Expected for age

The average 2018 JAGUAR XJ has 44,709 miles on the clock, which is below the expected 59,200 miles for a 8-year-old car. This suggests lighter use than average, which generally means less wear on major components.

Looking at a specific JAGUAR XJ?

Enter its reg plate for a free check with full MOT history, mileage verification, and predicted costs.

Best Year to Buy?

The most reliable year is the 2019 model with a 94% MOT pass rate, while the 2002 model has the lowest at 77%. The 2018 sits between the two at 93%.

JAGUAR XJ by Year

Year	Pass Rate	Tests	Avg Mileage
2020	92%	411	32,227 mi
2019	94%	1,023	35,571 mi
2018	93%	1,682	44,709 mi
2017	93%	2,143	54,518 mi
2016	91%	2,811	64,986 mi
2015	91%	2,316	67,462 mi
2014	89%	2,511	81,854 mi
2013	87%	2,758	93,880 mi
2012	89%	2,482	93,337 mi
2011	84%	4,043	100,648 mi
2010	84%	3,442	107,407 mi
2009	85%	1,332	97,971 mi
2008	82%	2,030	101,627 mi
2007	82%	2,721	103,444 mi
2006	82%	2,874	103,550 mi
2005	80%	2,105	106,159 mi
2004	78%	3,267	108,216 mi
2003	81%	3,134	110,063 mi
2002	77%	955	92,681 mi
2001	79%	972	91,862 mi
2000	78%	888	90,401 mi
1999	77%	1,298	91,922 mi
1998	77%	2,154	92,573 mi
1997	80%	2,029	105,434 mi
1996	82%	1,861	104,724 mi
1995	79%	1,401	101,040 mi
1994	86%	635	87,486 mi
1993	82%	401	88,629 mi
1992	82%	328	89,641 mi
1991	82%	243	95,193 mi
1990	86%	282	83,101 mi

Similar Cars to Consider

MERCEDES E

2019 · 2925cc Diesel

£1,690/year

90%

-3%

MERCEDES GLC

2018 · 2987cc Diesel

£1,690/year

91%

-2%

AUDI A5

2017 · 2967cc Diesel

£1,840/year

89%

-4%

FORD RANGER

2019 · 3198cc Diesel

£1,840/year

87%

-6%

Check a Specific Jaguar Xj

Enter a reg plate to get the full MOT history, health score, and mileage verification.

Upgrade to Premium (£4.99) for stolen, finance, and write-off checks.

About the 2018 JAGUAR XJ

The 2018 JAGUAR XJ is a premium performance with a 2993cc diesel engine. 1,682 of these vehicles were MOT tested in 2026, making it a reasonably common sight on UK roads. Among all cars from 2018, the average MOT pass rate is 89%, and this model beats that benchmark.

With an average of 44,709 miles at 8 years old, JAGUAR XJ owners tend to use this car less than the typical driver.

2018 JAGUAR XJ Fuel Costs

The 2993cc diesel engine is on the larger side, so fuel won't be this car's strong point. Expect around 40 mpg in mixed driving, which works out to roughly £1,245 per year at current diesel prices of 148p per litre (based on 7,400 miles per year). Diesel cars of this age should have their DPF (diesel particulate filter) checked, as replacements can be costly.

What does it cost to own a 2018 JAGUAR XJ?

Total estimated annual running cost is £1,695 (£141/month), broken down as £1245 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 93% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

JAGUAR XJ Reliability Trend

Newer JAGUAR XJs show better MOT pass rates than older ones, with an average improvement of 7 percentage points.

Buying a Used 2018 JAGUAR XJ

At 8 years old, this is a solid used buy if you find one with good service history. Depreciation has levelled off, so you won't lose much more value. Focus on condition over mileage. If you're flexible on year, the 2019 model has the highest pass rate at 94%.

Common Issues to Watch For

Based on the 2018 JAGUAR XJ's fuel type, age, and engine size, these are the most likely problem areas to check.

DPF (Diesel Particulate Filter)

Watch out

Short journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.

Turbo Wear

Watch out

Diesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.

AdBlue System

Medium risk

Post-2015 diesels use AdBlue for emissions. Sensor failures and tank heater issues are common. Budget £200-£500 for repairs.

EGR Valve

Watch out

Exhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.

Dual Mass Flywheel

Watch out

Larger diesel engines put extra strain on the dual mass flywheel. Listen for rattling at idle. Replacement with clutch is £800-£1,500.

Suspension Wear

Medium risk

Shock absorbers, springs, and anti-roll bar links typically need attention around this age. Listen for clunks over bumps and check for uneven tyre wear.

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 2018 JAGUAR XJ stacks up against similar cars for annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
JAGUAR XJ(2018)	93%	£1245	£195	Grp 30-42	£1695
MERCEDES E(2019)	90%	£1245	£190	Grp 30-42	£1690-£5
MERCEDES GLC(2018)	91%	£1245	£190	Grp 30-42	£1690-£5
AUDI A5(2017)	89%	£1245	£190	Grp 30-42	£1840+£145
FORD RANGER(2019)	87%	£1245	£190	Grp 35-50	£1840+£145

Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.