I installed the Spartan 2 with the LSU4.9 it came with, connected it to my Speeduino ECU and it works. Great. I blew my first sensor after about a month. It only reads superlean, it worked correct before it broke. My guess; I messed about with the tune getting the car going. The second sensor gave up in similar fashion two months later, the forums and Fakebook told me I should only fire up the Spartan 2 after the engine had started up. OK, so I made a 20 second delay after reaching 500 rpm or more. New sensor, back in business. Third sensor broke a lot later, but the car was off the road for a while for new sills and a respray. Some people say it is from the temp shock because I use fuel cut on decelleration. I doubt that. New sensor in. That one failed me again, now after a few months. The sensor is in the correct position (sensor poining straight down, wires up), just after the final Y junction on my Mazda MX-5 NB 1.8. I doubt the sensors are the problem, as huge numbers of OEM cars run those without issues. I only used genuine Bosch sensors. I now tried an AliEpress sensor, but that didn’t work in the first place. I can buy a Bosch sensor again, but I need to find the issue. Spending € 90,- bi-monthly on the sensors is getting old, not to mention expensive. On Fakebook, I find other users of the Spartan 2 with similar issues, but also happy users. What can I check, how can I prevent the failure of the sensors?