Every California smog check term and question, plainly defined
What should I know about Audi smog checks in California?
Audi gasoline vehicles pass California smog reliably when well-maintained, but EVAP system sensitivity and the Dieselgate recall requirement on TDI diesel models are the primary watch points.
Audi TDI diesel models (A3 TDI, Q7 TDI, 2009-2015): affected by Volkswagen Dieselgate — recall remedy must be confirmed complete before the vehicle can pass smog inspection
2.0T FSI and TFSI engines (A4, A5, A6, Q5 2006-2016): direct-injection carbon buildup on intake valves at 60,000-80,000 miles is the most common cause of misfires and readiness failures
EVAP system on Audi A4/A6/Q5: multiple small leak sources (purge valves, hose connections) cause P0441/P0442 codes — European EVAP designs are leak-sensitive
2.7T and 4.2L V8 models (S4, A8 2000-2008): secondary air injection pump failures cause cold-start emission codes; timing chain issues on high-mileage examples
Audi A3 e-tron PHEV: not exempt from smog — same full inspection as conventional vehicles; combustion mode drive cycle required before testing
European OBD reporting on Audi can include additional monitors; all monitors must be complete before testing
Per BAR inspection data, VW Dieselgate recall database, and Audi TSB documentation.