Sometimes it is necessary to run two I2C buses. To do this the ESP SDK needs to be informed which pins will be used for each I2C bus and the buses needs to be initialized separately.
Example code:

#include <Arduino.h>
#include <Wire.h>
 
TwoWire I2Cone = TwoWire(0);
TwoWire I2Ctwo = TwoWire(1);`
 
void setup() {
  I2Cone.begin(21,22,100000); // SDA pin 21, SCL pin 22, 100kHz frequency
  I2Ctwo.begin(16,17,400000); // SDA pin 16, SCL pin 17, 400kHz frequency
}
 
void loop() {
  I2Cone.beginTransmission(0x38);
  I2Cone.write(0x00 | 0x80);
  I2Cone.write(0x03);
  I2Cone.endTransmission();
 
  I2Ctwo.beginTransmission(0x42);
  I2Ctwo.write(140);
  I2Ctwo.endTransmission();
  I2Ctwo.requestFrom(0x42,1);
  if (I2Ctwo.available() == 1) {
    byte value = I2Ctwo.read();
  }
}