"Is the A5 2.7 TDI reliable, and what should you check?"
The most frequently mentioned issue when buying a used Audi A5 2.7 TDI 2009 (8F/8T): Leaks from the intercooler / oil-water heat exchanger. Also, clogged DPF (failed regenerations) is commonly reported.
Caution advised
Most reported issue: Leaks from the intercooler / oil-water heat exchanger. Service history and a test drive matter.
Engine / trim
2.7 TDI
Model years
2009
Known issues and risks
Listed from most frequently reported, each with its source.
Leaks from the intercooler / oil-water heat exchanger
Often reported
The cooling/oil circuit includes heat exchangers and pipes whose seals can leak or crack with age and mileage, leading to oil/antifreeze mixing, external leaks, and risk of turbo damage if fluid reaches the turbine.
Engine Bay
Clogged DPF (failed regenerations)
Often reported
The diesel particulate filter (DPF) tends to clog, especially with city driving and high mileage.
Exhaust Emissions
Blocked or faulty EGR valve
Often reported
On the V6 2.7 TDI, clogging and failure of the EGR valve and passages due to soot and oil deposits are common; causing performance loss, smoke on startup, and engine warning light.
Exhaust Emissions
Injection system issues (injectors/high pressure)
Often reported
At high mileage, injection system problems are reported: worn injectors or high-pressure pump failures can cause uneven spraying, shuddering, increased fuel consumption, and engine warning lights.
Fuel System
Turbocharger/actuator fatigue or failure
Often reported
Many V6 2.7 TDI vehicles report turbocharger or actuator (wastegate) failures; this causes loss of boost pressure, smoke, and power drop. More common in worn units or after improper maintenance.
Turbo
Audi A5 2.7 TDI technical specs
Audi A5 2.7 TDI (2009): boot 480 L; fuel use 6,5 l/100 km (urban 8 l/100 km · extra-urban 5,6 l/100 km); 0–100 in 7.9 s.
Boot capacity
480 L
Fuel consumption
6,5 l/100 km (urban 8 l/100 km · extra-urban 5,6 l/100 km)
What should I look for when buying an Audi A5 2.7 TDI?+
When buying a 2009 model 2.7 TDI, check the service history, test drive, and engine/transmission warnings. The most commonly reported issues: Leaks from the intercooler / oil-water heat exchanger; Clogged DPF (failed regenerations); Blocked or faulty EGR valve.
What are the chronic problems of the Audi A5 2.7 TDI?+
The most commonly reported issues: Leaks from the intercooler / oil-water heat exchanger; Clogged DPF (failed regenerations); Blocked or faulty EGR valve.
Is the Audi A5 2.7 TDI reliable?+
Rather than a simple yes/no, it's best to weigh the proven pros and cons together. This page lists 5 verified findings.
How does Carbeak collect data?+
The cards on this page are derived from Difetti fault database records; the source vehicle is matched to the target vehicle by brand, fuel, engine, and generation. Topics with insufficient evidence are not shown.