"How Your Car’s Intake Sensors Work – MAP & Temperature Sensor Explained!" Discover how your car’s intake sensors work! Learn how pressure and temperature data fine-tune your engine’s performance—plus how to test them with a multimeter. Key Insight: The intake manifold's pressure and temperature sensors (integrated into one unit) use a silicon chip with piezo-resistive technology to measure air density, which is critical for fuel injection timing and engine efficiency. Even minor installation er