The air quality sensor (1K0907659) appears to have failed on our 2013 Yeti. In VCDS it is throwing the DTC 9481988 - Air Quality Sensor B10AF 04 [008] - Internal System Fault

The price of a replacement OEM part was £140 plus the hassle of a 1 hour round trip to collect it from the dealer. So given the price of £20 for a Chinese version, I have tried that. However it is giving me a different fault 9479189 - Signal Line for Air Quality Sensor B10A4 15 [008] - Open or Short to Plus Upon testing this Chinese part on a bench using a PSU set to 12V 0.1A, with pin 1 (12V), pin 2 GND, then I'm seeing 10.5V on pin 3 for a few seconds and then it drops to 9.5V for the remaining time. It is drawing 45mA and then 0mA respectively. I think it is simply a fault part but curious to know how others have got on with the Chinese part? Has anybody got voltage & current values for a known good sensor? The old failed sensor I have has 0.5V on pin 3 and is drawing about 10mA constantly.

Edited 2 hours ago2 hr by rabbituk

I believe there are two different styles of sensor around this time, one with an output that is at a low voltage when measured with a meter, the other with an output that sits high as measured with a multimeter. You may have the wrong type. The latter, later type is the LIN-based one, I think, but would need your VIN to research which type your car should have.

See G65 sensor no signal - Skoda Octavia Mk3 (2013 - 2020) - BRISKODA

I'll message you to ask for the VIN. Is there no letter suffix after the core 1K0907659 part number you mentioned.?

Those suffix letters can identify/disambiguate completely incompatible versions.

Edited 31 minutes ago31 min by Breezy_Pete