The Predictive Maintenance Market is set to grow threefold from 2020 to 2025, reaching $12 billion (about $37 per person in the US), according to Markets and Markets. There is a growing emphasis on tapping the potential of Predictive Maintenance across industries. Predictive Maintenance or Predictive Analytics based maintenance relies on the statistical analysis of realtime health and operational parameters of the equipment in use. These help in planning the maintenance ahead of time and avoid any disruptions in the process that is crucial for mission-critical industries. In this whitepaper on Predictive Analytics Library (PAL) to Detect Engine Fault Detection, we have discussed an Overview to Predictive Maintenance, introduction to Predictive Analytics for Vehicle Engine Software, PAL Software Overview, and PAL Module Overview.