AUDI S4 (1999)
Running costs, common problems, and reliability data based on 142 real MOT tests in 2024.
MOT Pass Rate
85%
Total Tests (2024)
142
Avg Mileage
161,691 mi
Est. Annual Cost
£2,247
Is the 1999 AUDI S4 reliable?
Good reliability. Occasional issues but generally solid. That's close to the national average of 82%. It falls below the AUDI brand average of 90%.
At 25 years old, 85% of AUDI S4s from 1999 passed their MOT first time in 2024. That's based on 142 tests across the UK. The average mileage at this age is 161,691 miles.
How does the 1999 AUDI S4 compare?
Mileage Analysis
The average 1999 AUDI S4 has 161,691 miles on the clock, which is in line with the expected 185,000 miles for a 25-year-old car, suggesting normal everyday use.
Best year to buy a AUDI S4?
The most reliable year is the 2013 model with a 94% MOT pass rate, while the 2006 model has the lowest at 78%. The 1999 sits between the two at 85%.
How much does a 1999 AUDI S4 cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
AUDI S4 by Year
Checking a specific AUDI S4?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 1999 AUDI S4
The 1999 AUDI S4 is a premium performance with a 2671cc petrol engine. 142 of these vehicles were MOT tested in 2024, making it a rare model on UK roads. It ranks in the top 17% of all 1999 cars for reliability.
With an average of 161,691 miles at 25 years old, AUDI S4 owners drive about as much as the UK average.
1999 AUDI S4 Fuel Costs
The 2671cc 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 £1,592 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).
What does it cost to own a 1999 AUDI S4?
Total estimated annual running cost is £2,247 (£187/month), broken down as £1592 fuel, £250 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 85% pass rate. Keeping on top of servicing will help avoid surprises.
AUDI S4 Reliability Trend
Newer AUDI S4s show better MOT pass rates than older ones, with an average improvement of 9 percentage points.
Buying a Used 1999 AUDI S4
At 25 years old, the AUDI S4 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 2013 model has the highest pass rate at 94%.
Alternatives to the 1999 AUDI S4
The AUDI S4 is actually the most reliable option among similar petrol premium performances from this era. Here are comparable petrol cars with similar engines:
- BMW 3 SERIES (2001) 77% pass rate (-8%) from 9,406 tests
- BMW Z3 (1998) 77% pass rate (-8%) from 8,057 tests
- MERCEDES SLK (1999) 79% pass rate (-6%) from 4,295 tests
- PORSCHE BOXSTER (2000) 82% pass rate (-3%) from 3,688 tests