High fuel consumption on an Audi 100 C4 2.3, dead lambda probe
20 liters per 100 km? Recently, I've noticed a sharp increase in fuel consumption on my Audi 100 C4 2.3. I immediately suspected a faulty oxygen sensor. I checked it with a multimeter. When the car warmed up, the oxygen sensor reading remained constant at 0.42 volts. I had to replace it.