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Each model has an internal index that reflects the level of modifications, based on the engine and other options installed.

For example, the VAZ-21103 variant has the 1. 5 L 16V engine, while the VAZ-21104 uses the latest 1. 6 L 16V fuel injection engine.

Since 2001, trim levels are also indicated by including a number after the main index: '- 00 ' means base trim level, '- 01 ' means standard trim and '- 02 ' designates deluxe version ; for example, VAZ-21121-02 means Lada 112 hatchback with an 1. 6L SOHC engine and deluxe trim.