Based on the product code , you are referring to the NO2 (Nitrous Oxide) sensor manufactured by NGK/NTK (Vehicle Sensor D-No 2).
If your current NO2 monitors are older than three years or you are still running the LMVV037 model, you are operating with compromised safety data. The cost of a new sensor is negligible compared to the liability of a missed gas leak. no2 lmvv038 new