diff --git a/src/drivers/barometer/lps22hb/lps22hb_main.cpp b/src/drivers/barometer/lps22hb/lps22hb_main.cpp
index f503da5d48..35d60be5fb 100644
--- a/src/drivers/barometer/lps22hb/lps22hb_main.cpp
+++ b/src/drivers/barometer/lps22hb/lps22hb_main.cpp
@@ -60,6 +60,12 @@ struct lps22hb_bus_option {
 	LPS22HB	*dev;
 } bus_options[] = {
 	{ LPS22HB_BUS_I2C_EXTERNAL, "/dev/lps22hb_ext", &LPS22HB_I2C_interface, PX4_I2C_BUS_EXPANSION, NULL },
+#ifdef PX4_I2C_BUS_EXPANSION1
+	{ LPS22HB_BUS_I2C_EXTERNAL, "/dev/lps22hb_ext1", &LPS22HB_I2C_interface, PX4_I2C_BUS_EXPANSION1, NULL },
+#endif
+#ifdef PX4_I2C_BUS_EXPANSION2
+	{ LPS22HB_BUS_I2C_EXTERNAL, "/dev/lps22hb_ext2", &LPS22HB_I2C_interface, PX4_I2C_BUS_EXPANSION2, NULL },
+#endif
 #ifdef PX4_I2C_BUS_ONBOARD
 	{ LPS22HB_BUS_I2C_INTERNAL, "/dev/lps22hb_int", &LPS22HB_I2C_interface, PX4_I2C_BUS_ONBOARD, NULL },
 #endif
diff --git a/src/drivers/barometer/lps25h/lps25h.cpp b/src/drivers/barometer/lps25h/lps25h.cpp
index e7afc3e623..8a6c3b0dd9 100644
--- a/src/drivers/barometer/lps25h/lps25h.cpp
+++ b/src/drivers/barometer/lps25h/lps25h.cpp
@@ -789,6 +789,12 @@ struct lps25h_bus_option {
 	LPS25H	*dev;
 } bus_options[] = {
 	{ LPS25H_BUS_I2C_EXTERNAL, "/dev/lps25h_ext", &LPS25H_I2C_interface, PX4_I2C_BUS_EXPANSION, NULL },
+#ifdef PX4_I2C_BUS_EXPANSION1
+	{ LPS25H_BUS_I2C_EXTERNAL, "/dev/lps25h_ext1", &LPS25H_I2C_interface, PX4_I2C_BUS_EXPANSION1, NULL },
+#endif
+#ifdef PX4_I2C_BUS_EXPANSION2
+	{ LPS25H_BUS_I2C_EXTERNAL, "/dev/lps25h_ext2", &LPS25H_I2C_interface, PX4_I2C_BUS_EXPANSION2, NULL },
+#endif
 #ifdef PX4_I2C_BUS_ONBOARD
 	{ LPS25H_BUS_I2C_INTERNAL, "/dev/lps25h_int", &LPS25H_I2C_interface, PX4_I2C_BUS_ONBOARD, NULL },
 #endif
diff --git a/src/drivers/barometer/mpl3115a2/mpl3115a2.cpp b/src/drivers/barometer/mpl3115a2/mpl3115a2.cpp
index da4c55ba92..0d89f5b674 100644
--- a/src/drivers/barometer/mpl3115a2/mpl3115a2.cpp
+++ b/src/drivers/barometer/mpl3115a2/mpl3115a2.cpp
@@ -714,6 +714,12 @@ struct mpl3115a2_bus_option {
 #ifdef PX4_I2C_BUS_EXPANSION
 	{ MPL3115A2_BUS_I2C_EXTERNAL, "/dev/mpl3115a2_ext", &MPL3115A2_i2c_interface, PX4_I2C_BUS_EXPANSION, NULL },
 #endif
+#ifdef PX4_I2C_BUS_EXPANSION1
+	{ MPL3115A2_BUS_I2C_EXTERNAL, "/dev/mpl3115a2_ext1", &MPL3115A2_i2c_interface, PX4_I2C_BUS_EXPANSION1, NULL },
+#endif
+#ifdef PX4_I2C_BUS_EXPANSION2
+	{ MPL3115A2_BUS_I2C_EXTERNAL, "/dev/mpl3115a2_ext2", &MPL3115A2_i2c_interface, PX4_I2C_BUS_EXPANSION2, NULL },
+#endif
 };
 #define NUM_BUS_OPTIONS (sizeof(bus_options)/sizeof(bus_options[0]))
 
diff --git a/src/drivers/barometer/ms5611/ms5611.cpp b/src/drivers/barometer/ms5611/ms5611.cpp
index bcc861d46d..eb14f5a1f9 100644
--- a/src/drivers/barometer/ms5611/ms5611.cpp
+++ b/src/drivers/barometer/ms5611/ms5611.cpp
@@ -869,6 +869,12 @@ struct ms5611_bus_option {
 #ifdef PX4_I2C_BUS_EXPANSION
 	{ MS5611_BUS_I2C_EXTERNAL, "/dev/ms5611_ext", &MS5611_i2c_interface, PX4_I2C_BUS_EXPANSION, NULL },
 #endif
+#ifdef PX4_I2C_BUS_EXPANSION1
+	{ MS5611_BUS_I2C_EXTERNAL, "/dev/ms5611_ext1", &MS5611_i2c_interface, PX4_I2C_BUS_EXPANSION1, NULL },
+#endif
+#ifdef PX4_I2C_BUS_EXPANSION
+	{ MS5611_BUS_I2C_EXTERNAL, "/dev/ms5611_ext2", &MS5611_i2c_interface, PX4_I2C_BUS_EXPANSION2, NULL },
+#endif
 };
 #define NUM_BUS_OPTIONS (sizeof(bus_options)/sizeof(bus_options[0]))
 
diff --git a/src/drivers/distance_sensor/ll40ls/ll40ls.cpp b/src/drivers/distance_sensor/ll40ls/ll40ls.cpp
index 01fcccaba9..37745141c2 100644
--- a/src/drivers/distance_sensor/ll40ls/ll40ls.cpp
+++ b/src/drivers/distance_sensor/ll40ls/ll40ls.cpp
@@ -75,6 +75,9 @@ static constexpr struct ll40ls_bus_option {
 #ifdef PX4_I2C_BUS_EXPANSION1
 	{ LL40LS_BUS_I2C_EXTERNAL, "/dev/ll40ls_ext1", PX4_I2C_BUS_EXPANSION1 },
 #endif
+#ifdef PX4_I2C_BUS_EXPANSION2
+	{ LL40LS_BUS_I2C_EXTERNAL, "/dev/ll40ls_ext2", PX4_I2C_BUS_EXPANSION2 },
+#endif
 #ifdef PX4_I2C_BUS_ONBOARD
 	{ LL40LS_BUS_I2C_INTERNAL, "/dev/ll40ls_int", PX4_I2C_BUS_ONBOARD },
 #endif
diff --git a/src/drivers/imu/mpu6000/mpu6000.cpp b/src/drivers/imu/mpu6000/mpu6000.cpp
index a655de13f7..0f0d1aaeba 100644
--- a/src/drivers/imu/mpu6000/mpu6000.cpp
+++ b/src/drivers/imu/mpu6000/mpu6000.cpp
@@ -2221,12 +2221,18 @@ struct mpu6000_bus_option {
 	MPU6000	*dev;
 } bus_options[] = {
 #if defined (USE_I2C)
-#  if defined(PX4_I2C_BUS_ONBOARD)
+#	if defined(PX4_I2C_BUS_ONBOARD)
 	{ MPU6000_BUS_I2C_INTERNAL, MPU_DEVICE_TYPE_MPU6000, MPU_DEVICE_PATH_ACCEL, MPU_DEVICE_PATH_GYRO,  &MPU6000_I2C_interface, PX4_I2C_BUS_ONBOARD, false, NULL },
-#  endif
-#  if defined(PX4_I2C_BUS_EXPANSION)
+#	endif
+#	if defined(PX4_I2C_BUS_EXPANSION)
 	{ MPU6000_BUS_I2C_EXTERNAL, MPU_DEVICE_TYPE_MPU6000, MPU_DEVICE_PATH_ACCEL_EXT, MPU_DEVICE_PATH_GYRO_EXT, &MPU6000_I2C_interface, PX4_I2C_BUS_EXPANSION,  true, NULL },
-#  endif
+#	endif
+#	if defined(PX4_I2C_BUS_EXPANSION1)
+	{ MPU6000_BUS_I2C_EXTERNAL, MPU_DEVICE_TYPE_MPU6000, MPU_DEVICE_PATH_ACCEL_EXT1, MPU_DEVICE_PATH_GYRO_EXT1, &MPU6000_I2C_interface, PX4_I2C_BUS_EXPANSION1,  true, NULL },
+#	endif
+#	if defined(PX4_I2C_BUS_EXPANSION2)
+	{ MPU6000_BUS_I2C_EXTERNAL, MPU_DEVICE_TYPE_MPU6000, MPU_DEVICE_PATH_ACCEL_EXT2, MPU_DEVICE_PATH_GYRO_EXT2, &MPU6000_I2C_interface, PX4_I2C_BUS_EXPANSION2,  true, NULL },
+#	endif
 #endif
 #ifdef PX4_SPIDEV_MPU
 	{ MPU6000_BUS_SPI_INTERNAL1, MPU_DEVICE_TYPE_MPU6000, MPU_DEVICE_PATH_ACCEL, MPU_DEVICE_PATH_GYRO, &MPU6000_SPI_interface, PX4_SPI_BUS_SENSORS,  false, NULL },
diff --git a/src/drivers/imu/mpu6000/mpu6000.h b/src/drivers/imu/mpu6000/mpu6000.h
index a5e38f25ba..0b5855e0d2 100644
--- a/src/drivers/imu/mpu6000/mpu6000.h
+++ b/src/drivers/imu/mpu6000/mpu6000.h
@@ -57,6 +57,8 @@
 #define MPU_DEVICE_PATH_GYRO_EXT	"/dev/mpu6000_gyro_ext"
 #define MPU_DEVICE_PATH_ACCEL_EXT1	"/dev/mpu6000_accel_ext1"
 #define MPU_DEVICE_PATH_GYRO_EXT1	"/dev/mpu6000_gyro_ext1"
+#define MPU_DEVICE_PATH_ACCEL_EXT2	"/dev/mpu6000_accel_ext2"
+#define MPU_DEVICE_PATH_GYRO_EXT2	"/dev/mpu6000_gyro_ext2"
 
 #define ICM20602_DEVICE_PATH_ACCEL		"/dev/icm20602_accel"
 #define ICM20602_DEVICE_PATH_GYRO		"/dev/icm20602_gyro"
diff --git a/src/drivers/imu/mpu9250/main.cpp b/src/drivers/imu/mpu9250/main.cpp
index 72151f694d..1f1772905f 100644
--- a/src/drivers/imu/mpu9250/main.cpp
+++ b/src/drivers/imu/mpu9250/main.cpp
@@ -83,6 +83,14 @@
 #define MPU_DEVICE_PATH_GYRO_EXT	"/dev/mpu9250_gyro_ext"
 #define MPU_DEVICE_PATH_MAG_EXT 	"/dev/mpu9250_mag_ext"
 
+#define MPU_DEVICE_PATH_ACCEL_EXT1	"/dev/mpu9250_accel_ext1"
+#define MPU_DEVICE_PATH_GYRO_EXT1	"/dev/mpu9250_gyro_ext1"
+#define MPU_DEVICE_PATH_MAG_EXT1 	"/dev/mpu9250_mag_ext1"
+
+#define MPU_DEVICE_PATH_ACCEL_EXT2	"/dev/mpu9250_accel_ext2"
+#define MPU_DEVICE_PATH_GYRO_EXT2	"/dev/mpu9250_gyro_ext2"
+#define MPU_DEVICE_PATH_MAG_EXT2	"/dev/mpu9250_mag_ext2"
+
 /** driver 'main' command */
 extern "C" { __EXPORT int mpu9250_main(int argc, char *argv[]); }
 
@@ -125,6 +133,12 @@ struct mpu9250_bus_option {
 #  if defined(PX4_I2C_BUS_EXPANSION)
 	{ MPU9250_BUS_I2C_EXTERNAL, MPU_DEVICE_PATH_ACCEL_EXT, MPU_DEVICE_PATH_GYRO_EXT, MPU_DEVICE_PATH_MAG_EXT, &MPU9250_I2C_interface, false, PX4_I2C_BUS_EXPANSION, PX4_I2C_OBDEV_MPU9250, NULL },
 #  endif
+#  if defined(PX4_I2C_BUS_EXPANSION1)
+	{ MPU9250_BUS_I2C_EXTERNAL, MPU_DEVICE_PATH_ACCEL_EXT1, MPU_DEVICE_PATH_GYRO_EXT1, MPU_DEVICE_PATH_MAG_EXT1, &MPU9250_I2C_interface, false, PX4_I2C_BUS_EXPANSION1, PX4_I2C_OBDEV_MPU9250, NULL },
+#  endif
+#  if defined(PX4_I2C_BUS_EXPANSION2)
+	{ MPU9250_BUS_I2C_EXTERNAL, MPU_DEVICE_PATH_ACCEL_EXT2, MPU_DEVICE_PATH_GYRO_EXT2, MPU_DEVICE_PATH_MAG_EXT2, &MPU9250_I2C_interface, false, PX4_I2C_BUS_EXPANSION2, PX4_I2C_OBDEV_MPU9250, NULL },
+#  endif
 #endif
 #ifdef PX4_SPIDEV_MPU
 	{ MPU9250_BUS_SPI_INTERNAL, MPU_DEVICE_PATH_ACCEL, MPU_DEVICE_PATH_GYRO, MPU_DEVICE_PATH_MAG, &MPU9250_SPI_interface, true, PX4_SPI_BUS_SENSORS, PX4_SPIDEV_MPU, NULL },
diff --git a/src/drivers/magnetometer/ist8310/ist8310.cpp b/src/drivers/magnetometer/ist8310/ist8310.cpp
index 457ec56a85..6711440b5c 100644
--- a/src/drivers/magnetometer/ist8310/ist8310.cpp
+++ b/src/drivers/magnetometer/ist8310/ist8310.cpp
@@ -1275,13 +1275,10 @@ struct ist8310_bus_option {
 } bus_options[] = {
 	{ IST8310_BUS_I2C_EXTERNAL, "/dev/ist8310_ext", PX4_I2C_BUS_EXPANSION, NULL },
 #ifdef PX4_I2C_BUS_EXPANSION1
-	{ IST8310_BUS_I2C_EXTERNAL1, "/dev/ist8311_int", PX4_I2C_BUS_EXPANSION1, NULL },
+	{ IST8310_BUS_I2C_EXTERNAL1, "/dev/ist8311_ext1", PX4_I2C_BUS_EXPANSION1, NULL },
 #endif
 #ifdef PX4_I2C_BUS_EXPANSION2
-	{ IST8310_BUS_I2C_EXTERNAL2, "/dev/ist8312_int", PX4_I2C_BUS_EXPANSION2, NULL },
-#endif
-#ifdef PX4_I2C_BUS_EXPANSION3
-	{ IST8310_BUS_I2C_EXTERNAL3, "/dev/ist8313_int", PX4_I2C_BUS_EXPANSION3, NULL },
+	{ IST8310_BUS_I2C_EXTERNAL2, "/dev/ist8312_ext2", PX4_I2C_BUS_EXPANSION2, NULL },
 #endif
 #ifdef PX4_I2C_BUS_ONBOARD
 	{ IST8310_BUS_I2C_INTERNAL, "/dev/ist8310_int", PX4_I2C_BUS_ONBOARD, NULL },
diff --git a/src/drivers/magnetometer/lis3mdl/lis3mdl_main.h b/src/drivers/magnetometer/lis3mdl/lis3mdl_main.h
index b6ca9872f4..b64e00555a 100644
--- a/src/drivers/magnetometer/lis3mdl/lis3mdl_main.h
+++ b/src/drivers/magnetometer/lis3mdl/lis3mdl_main.h
@@ -54,6 +54,12 @@ struct lis3mdl_bus_option {
 #ifdef PX4_I2C_BUS_EXPANSION
 	{ LIS3MDL_BUS_I2C_EXTERNAL, "/dev/lis3mdl_ext", &LIS3MDL_I2C_interface, PX4_I2C_BUS_EXPANSION, NULL },
 #endif /* PX4_I2C_BUS_EXPANSION */
+#ifdef PX4_I2C_BUS_EXPANSION1
+	{ LIS3MDL_BUS_I2C_EXTERNAL, "/dev/lis3mdl_ext1", &LIS3MDL_I2C_interface, PX4_I2C_BUS_EXPANSION1, NULL },
+#endif /* PX4_I2C_BUS_EXPANSION1 */
+#ifdef PX4_I2C_BUS_EXPANSION2
+	{ LIS3MDL_BUS_I2C_EXTERNAL, "/dev/lis3mdl_ext2", &LIS3MDL_I2C_interface, PX4_I2C_BUS_EXPANSION2, NULL },
+#endif /* PX4_I2C_BUS_EXPANSION2 */
 #ifdef PX4_I2C_BUS_ONBOARD
 	{ LIS3MDL_BUS_I2C_INTERNAL, "/dev/lis3mdl_int", &LIS3MDL_I2C_interface, PX4_I2C_BUS_ONBOARD, NULL },
 #endif /* PX4_I2C_BUS_ONBOARD */