The definition of the B1487 Code can be different and it varies on the model and manufacturer of the car. The definition of the code is easy to understand if you read the manual and know the model number with the name of the manufacturer. The catalytic converter contains an oxygen sensor behind and in front it. When the car is hot and successively in secured loop mode, the upstream oxygen sensor waveform reading should vary. Moreover, to these matters, the company planned a hydraulically measured method that could be converted from within the vehicle, the version they realized had to be manually altered in the engine section using hand gears.