EngineHigh
N20/N26 timing chain and guide wear (earlier builds most affected).
BMW 3 Series vs Audi A4 · reliability compared
Both scores come from the documented faults we hold for each model · severity weighted, then priced at UK independent-garage rates so you can see which car carries the bigger risk.
The short answer
On the faults we hold, the BMW 3 Series scores 6.7 against 5.9 for the Audi A4 · fewer or less severe documented problems. The Audi A4 carries the higher worst-case repair bill.
BMW 3 Series
2012–2018
6.7/ 10
Solid- Documented faults
- 4
- Critical / high
- 0 / 2
- Medium / low
- 2 / 0
- Priciest job
- £900–£2,600
- Worst-case total
- £6,400
Weak spots · Engine, Cooling
Audi A4
2009–2016
5.9/ 10
Mixed- Documented faults
- 4
- Critical / high
- 1 / 1
- Medium / low
- 2 / 0
- Priciest job
- £900–£2,600
- Worst-case total
- £6,400
Weak spots · Engine, Intake, Cooling
The faults that decide it
CoolingHigh
Electric water pump and thermostat failure.
EngineHigh
2.0T TFSI excessive oil consumption from worn piston rings (early builds).
EngineCritical
Timing chain tensioner failure — can cause catastrophic damage if it lets go.
Scores are computed from the documented faults in our library for each model · they reflect reported patterns, not the condition of a specific car.
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