Jaguar 420G Reliability, MOT Pass Rate & Common Faults
Free Jaguar 420G car check
Is the Jaguar 420G reliable? We analysed 1,384 real MOT tests across 196 vehicles to find out.
Got a specific Jaguar 420G? Enter the reg for a free check:
The Jaguar 420G is above average for reliability based on real UK MOT data. Common problems include windscreen washer provides insufficient washer liquid, brake binding and suspension component mounting prescribed area is excessively corroded. Here's everything you need to know before buying a used Jaguar 420G.
Jaguar 420G Number Plates
Number plates registered to a Jaguar 420G. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Jaguar 420G MOT Pass Rate by Year
How likely is a Jaguar 420G to pass its MOT? Here's the pass rate for each registration year, newest first.
Jaguar 420G Problems — What Goes Wrong?
The most common reasons a Jaguar 420G fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Jaguar 420G Mileage — What's Normal?
How many miles does a typical Jaguar 420G owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Jaguar 420G MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Jaguar 420G year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 1970 | 258 | 86.0% | 28,039 | 46,650 | 75,320 |
| 1969 | 490 | 78.4% | 38,561 | 68,616 | 83,733 |
| 1968 | 382 | 82.5% | 19,473 | 52,265 | 75,968 |
| 1967 | 166 | 79.5% | 3,527 | 53,314 | 76,408 |
How Long Does a Jaguar 420G Last?
Based on 196 Jaguar 420G vehicles on UK roads.
Jaguar 420G Mileage Distribution
Total mileage recorded across all Jaguar 420G MOT tests. If the car you're looking at is above the 75th percentile, it's done more miles than most.
Best Year to Buy a Used Jaguar 420G
Based on MOT pass rates across all registration years with sufficient test data.
86.0% MOT pass rate from 258 tests
78.4% MOT pass rate from 490 tests
The best year to buy a used Jaguar 420G is 1970, which has the highest MOT pass rate at 86.0% across 258 tests. The 1969 model year has the lowest pass rate at 78.4% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the Jaguar 420G Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Jaguar 420G THIS CAR | 81.4% | 1,384 | 58,598 mi | 59 yrs |
| Jaguar X-type | 73.4% | 1,912,556 | 80,596 mi | 25 yrs |
| Jaguar Xf | 80.8% | 1,374,522 | 65,620 mi | 18 yrs |
| Jaguar S-type | 74.5% | 942,176 | 77,805 mi | 27 yrs |
| Harley-davidson Fxd | 88.6% | 1,056 | 16,174 mi | 31 yrs |
Compared to the Jaguar X-type (73.4% pass rate) and the Jaguar Xf (80.8% pass rate), the Jaguar 420G outperforms both on MOT reliability.
Found a Jaguar 420G you like?
Run a full vehicle history check on the specific car. See finance, stolen, write-off, mileage and MOT data for that exact vehicle.
Check a specific Jaguar 420GShould you buy a used Jaguar 420G?
The Jaguar 420G has an overall MOT pass rate of 81.4% across 1,384 real MOT tests — comfortably above the UK average, which puts it among the more reliable models on UK roads.
The most common problems on the Jaguar 420G are windscreen washer provides insufficient washer liquid (55 recorded failures), brake binding (47), and suspension component mounting prescribed area is excessively corroded (41). These are the faults most likely to cause an MOT failure on this model, so check for them carefully on any test drive or pre-purchase inspection. Many are wear-and-tear items that can be budgeted for, but a car that's already failing on multiple fronts may signal neglected maintenance.
A typical Jaguar 420G owner drives around 249 miles per year. If the car you're looking at is significantly above this, expect more wear on suspension, brakes and tyres. If it's well below, the vehicle may have been sitting unused — check for perished rubber, corroded discs and stale fluids.
In terms of longevity, most Jaguar 420G models stay on UK roads for around 59 years — a strong showing that suggests solid build quality and readily available parts. If you're buying one that's already approaching that window, the data suggests it has plenty of life left provided it's been maintained.
Before committing to a purchase, we recommend running a full vehicle history check on the specific car. This will reveal any outstanding finance, stolen markers, write-off history and mileage discrepancies that the seller may not disclose — and that the MOT data alone can't tell you.