Ran a quick analog test today and code returned was 31, Also this kit has inbuilt LED on the multiplexer which also blinked 31 times while doing analog test on pin 8.

The O2 sensor was recently replaced as a routine along with new spark plugs couple of months before MAS failure, I still have the old O2 sensor which was not faulty. I am planning to try the old O2 sensor this weekend.

Vehicle idles and runs fine, but slight RPM variation can be found with slight vehicle vibration periodically. (RPM variation or Vibration seems to repeat every 10 sec.). Also Vehicle needs more(duration) cranking when it is hot, sometime it seems like each cylinder is coming alive one by one, but I don't notice this on cold start.