02 Audi 1 8t Engine Diagram Sensors. Sensor 1 sensor 1 would be the first o2 sensor in the line of sensors starting with the exhaust manifold and making its way back to the exhaust pipe. No that code is for bank 1 sensor 2.
The secondary o2 sensor this applies to the b5 a4 18t is really only there to monitor the exhaust flow ie condition of the cat converter. This pictorial diagram shows us a physical connection that is much easier to understand in an electrical. Its components are shown by the pictorial to be easily identifiable.
150 240 bhp from the factory.
It is the one after the core of your catalytic converter. Its components are shown by the pictorial to be easily identifiable. Check the wiring for open circuit between the ecm test box and 3 pin harness connector according to the wiring diagram. 150 240 bhp from the factory.