View 2005 Audi A4 1.8 T Quattro Problems Audi engine problems ticking noise. Ford mondeo 1.8 tdci engine specifications & problems. 2005 Audi A4 - Pictures - CarGurus from static.cargurus.com Sams and hess gas= only problems , the worse gas on market.stay away from it. I always thought our cars specially 1.8t are very sensitive on the gas u put on em. Fuel filter, fuel injectors, coils, spark plugs, crank sensor , cam sensor & canister purge valve.