To increase their productivity, industrial companies are investing in the implementation of the Lean Manufacturing (LM) approach. Based on an analysis of the value chain, the approach reduces waste between the different production processes. The scope of this concept remains limited because it is based on static data. The technologies of the industry 4.0 concept allow the collection of data in real time. In this article, we present the results of a study conducted among companies in the automotive industry based in Morocco, in order to assess the level of deployment of the technologies of the 4.0 industry concept, and then analyze the impact of these technologies on the levers and key performance indicators of the Lean manufacturing approach. We have highlighted the technologies that have the most impact, namely: ERP, machine-to-machine communication (M2M communication), AIDC (Automatic Identification and Data Capture) and data analysis. The most impacted performance indicators are: Cycle Time, Takt Time, Lead Time and OEE.