1. Insufficient oil level (see «Oil level - check» or «Engine lubrication system 1.6i - checking the oil level»).
2. Idle speed below normal (see «Checking the technical condition of the engine management system»).
3. Short circuit «sensor - control lamp» (see wiring diagrams).
4. The sensor of a control lamp of emergency oil pressure is faulty (see «Oil emergency pressure sensor in the engine - replacement»).
5. Worn crankshaft and/or oil pump main bearings (see «Checking the technical condition of the engine», And «Oil pump - removal, inspection and installation»).