Audi A3 TDI
Audi's latest recall of the 2012-2012 A3 TDI is unusual, not in that it's a diesel or an Audi, but because of the reason: an odd confluence of engine RPM and fuel line pressure that can cause a leak. The problem is limited to the VW-sourced 2.0-liter TDI engine in 7,335 A3 TDIs built between September 2009 and September 2011. Under a certain set of load and engine RPM conditions, the fuel injector pulses coincide with the frequency of the second cylinder, creating a resonance that can cause stress cracks to form in the fuel line. The cracks can then leak fuel onto hot parts of the engine...