hi plugged my laptop in to check engine light on an up came.
17528 OXYGEN (LAMBDA) SENSOR HEATING B2 S1:
OPEN CIRCUIT P1120-004 NO SIGNAL/COMMUNICATION.
I changed the lambda sensor (nightmare) and switched the mil light off but after stopping and starting the car it came back on with the same fault code i checked both lambda sensors with a multimeter and got readings of 9.7ohms and 9.3ohms i knew there was nothing wrong with them but i just changed the pre-cat drivers side one anyway as stated in the cd manual and as i say the fault still there does this mean the heater circuit is at fault does anyone know where to go from here,i dont want to take it to audi just yet.
thanks tom.
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IIRC Bank 2 is the passenger side. S1 is the pre cat sensor. Check for 12v feed and a good earth on the white wires and a good earth on the grey. Black wire is the signal.
Without checking the wiring diagram I'd suggest all sensors are heated via the same relay so suspect a wiring prob if no supply to B2S1
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