I bought cheap O2 sensors on Alibaba through ALiexpress thinking they are all the same and oh my dear did I suffer. Eventually I Fixed my car after buying the proper sensors and paying the premium.
I replaced both Pre-cat and Post-cat Lambda O2 sensors with decent NGK NTK Japan Nippon original sensors. The cheaper chinese sensors are a complete waste of money and will cause all sorts of problems. I have learn't the hard way and I hope others can learn from my silly mistake. Also Alibaba or Aliexpress will not return your money in the event of a complaint and to rub salt in the wound they paid the supplier even after I complained with no come back. Buy good spares from reputable sellers is the motto.
Summary use original spares where possible, avoid cheap chinese spares from places like aliexpress or Alibaba.
Thanks all for the excellent forum!
