Could you run the i2c_scanner, to check if the chip is actually visible on the i2c bus : Arduino Playground - I2cScanner
The link to your sensor is this: NXP® Semiconductors Official Site | NXP Semiconductors
What code are you using ? Please provide a link or the sketch.
Which breakout board are you using ?
Do you use the 3.3V from the Arduino Uno for the sensor ?
Can you upload a photo, so we can see how it is connected ?