automotive diagnostics
7 Engine Fault Codes Cut Idle Time
The seven fault codes - P0420, P0171, P0300, P0102, P0113, P0135, and P0455 - signal conditions that, when acted on with real-time routing, can reduce fleet idle time by up to 18%. In the United States, the OBD requirement triggers alerts when emissions exceed 150% of the certified standard (Wikipedia)