ok so I tried: (I also tried setting the values to HIGH)
digitalWrite(A4,LOW);
digitalWrite(A5,LOW);
it didn't work. I am guessing because :
"This sensor board has a voltage regulator. So it can be used with 3.3V and with 5V. It has pull-up resistors of 2k2 on the I2C-bus. The value of 2k2 is rather low. If it is combined with other sensor board which have also pull-up resistors, the total pull-up impedance might be too low."
Anything else I can try?