To get the accurate meaning of the B1495 Code, you need to know the model and manufacturer. For getting the accurate meaning of the code, it is necessary to read the manual. However, reading the manual is important. However, for solving the problem, it is necessary to get proper guidance and important machineries. That is why, it is better if you take the car to repair center where the car can be fixed and all expensive tools are available. The catalytic converter has an oxygen sensor what is found in front and behind it. When the vehicle is hot and running in closed loop mode for long time, the upstream oxygen sensor waveform reading should vary.