"Is the A4 2.0 TDI reliable, and what should you check?"
When buying a used Audi A4 2.0 TDI 2009 (B8), the most frequently mentioned issue is swirl flap mechanism failures. Additionally, EGR valve / EGR cooler failure is also commonly reported.
Engines available in this year
Engine varies by trim; verify the engine code on the listing.
CBBB,CFGB
2.0 TDI · 2.0 TDI (170 bg)
CBAB,CFFB,CLJA
2.0 TDI · 2.0 TDI (140 bg)
EA189/CAHA
2.0 TDI · 2.0 TDI (170 bg)
EA189/CAGA
2.0 TDI · 2.0 TDI (143 bg)
EA189/CAGB
2.0 TDI · 2.0 TDI (136 bg)
EA189/CAGC
2.0 TDI · 2.0 TDI (120 bg)
CAHA
2.0 TDI · 2.0 TDI (170 bg)
Known issues and risks
Listed from most frequently reported, each with its source.
Swirl flap mechanism failures
Often reported
Early 2.0 TDI models with swirl flap intake manifolds have reliability issues: the actuation mechanism can stick or break, causing power loss and in severe cases damage to the intake port.
Engine Bay
EGR valve / EGR cooler failure
Often reported
Early 2.0 TDI examples (approx. 2008-2009) report failures or malfunction of the EGR valve and cooling circuit (regulator/cooler). The issue can cause carbon buildup, power loss, and rough running.
When buying a 2009 2.0 TDI, check the service history, test drive, and look for engine/transmission warnings. Most commonly reported issues: swirl flap mechanism failures; EGR valve / EGR cooler failure; high-pressure fuel pump / injector problems (Bosch CP4).
What are the common problems of the Audi A4 2.0 TDI?+
Rather than a simple yes/no, it's best to weigh the proven pros and cons together. This page lists 3 verified findings.
How does Carbeak collect data?+
The cards on this page are derived from Difetti fault database records; brand, fuel, engine, and generation compatibility between the source vehicle and target vehicle is verified. Insufficient evidence topics are not shown.