Hi All
This seems a relatively rare single code - a Search of A2OC shows one occurrence back in 2013. The title on that thread wasn't clear and there was no outcome reported, so I have started this one.
Yellow engine light comes up and stays on - no change in performance or economy that I can detect.
Using my simple Gendan VAGScanner fault code reader it shows the single code 16523.
This is diagnosed as:-
16523 - Oxygen (Lambda) Sensor B1 S2
P0139 - 35-10 - Response too Slow - Intermittent
B1 = Bank 1 and S2 = Sensor 2 (Previous poster took this to be Post cat).
If I erase the code the light goes off but it reappears after about 500 miles with the same fault. It's done this several times. Car (2004 1.6 FSI) has done 120 000 miles.
Does anyone else have experience of this fault, please?
The advice for rectification is to check for wiring and exhaust leak problems before replacing the sensor. Assuming it is the post cat one, it's not so easy to find (apart from going back to Audi). Euro Car Parts only lists the pre cat sensor.
Regards
Mark
This seems a relatively rare single code - a Search of A2OC shows one occurrence back in 2013. The title on that thread wasn't clear and there was no outcome reported, so I have started this one.
Yellow engine light comes up and stays on - no change in performance or economy that I can detect.
Using my simple Gendan VAGScanner fault code reader it shows the single code 16523.
This is diagnosed as:-
16523 - Oxygen (Lambda) Sensor B1 S2
P0139 - 35-10 - Response too Slow - Intermittent
B1 = Bank 1 and S2 = Sensor 2 (Previous poster took this to be Post cat).
If I erase the code the light goes off but it reappears after about 500 miles with the same fault. It's done this several times. Car (2004 1.6 FSI) has done 120 000 miles.
Does anyone else have experience of this fault, please?
The advice for rectification is to check for wiring and exhaust leak problems before replacing the sensor. Assuming it is the post cat one, it's not so easy to find (apart from going back to Audi). Euro Car Parts only lists the pre cat sensor.
Regards
Mark