diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9abc2314f..e20113aad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ All notable changes to this project will be documented in this file.
 - Support for I2C M5Unit (Mini)Scales using HX711 driver
 - Berry virtual Energy driver (#22134)
 - Support for RX8010 RTC as used in IOTTIMER (#21376)
+- ESP8266 experimental support for second I2C bus
 
 ### Breaking Changed
 
diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 4511b678e..36a828fbc 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -131,6 +131,7 @@ The latter links can be used for OTA upgrades too like ``OtaUrl https://ota.tasm
 - Support nexus protocol and calculation of separation limit to rc-switch library [#21886](https://github.com/arendst/Tasmota/issues/21886)
 - KNX additional KnxTx functions and define KNX_USE_DPT9 [#22071](https://github.com/arendst/Tasmota/issues/22071)
 - SML multi TRX line [#22056](https://github.com/arendst/Tasmota/issues/22056)
+- ESP8266 experimental support for second I2C bus
 - Zigbee Koenkk firmware 20240710 for Sonoff Zigbee ZBPro [#22076](https://github.com/arendst/Tasmota/issues/22076)
 - Berry Zigbee improvements to prepare Matter [#22083](https://github.com/arendst/Tasmota/issues/22083)
 - Berry virtual Energy driver [#22134](https://github.com/arendst/Tasmota/issues/22134)
diff --git a/tasmota/include/tasmota.h b/tasmota/include/tasmota.h
index 82485ab0e..627596474 100644
--- a/tasmota/include/tasmota.h
+++ b/tasmota/include/tasmota.h
@@ -94,7 +94,6 @@ const uint16_t VL53LXX_MAX_SENSORS = 8;     // Max number of VL53L0X sensors
 const uint8_t MAX_SR04 = 3; // Max number of SR04 ultrasonic sensors
 
 #ifdef ESP32
-const uint8_t MAX_I2C = 2;                  // Max number of I2C controllers (ESP32 = 2)
 const uint8_t MAX_SPI = 2;                  // Max number of Hardware SPI controllers (ESP32 = 2)
 const uint8_t MAX_I2S = 2;                  // Max number of Hardware I2S controllers (ESP32 = 2)
   #if CONFIG_IDF_TARGET_ESP32
@@ -109,7 +108,6 @@ const uint8_t MAX_I2S = 2;                  // Max number of Hardware I2S contro
   const uint8_t MAX_RMT = 0;                // Max number or RMT channels (0 if unknown)
   #endif
 #else
-const uint8_t MAX_I2C = 0;                  // Max number of I2C controllers (ESP8266 = 0, no choice)
 const uint8_t MAX_SPI = 0;                  // Max number of Hardware SPI controllers (ESP8266 = 0, no choice)
 const uint8_t MAX_I2S = 0;                  // Max number of Hardware I2S controllers (ESP8266 = 0, no choice)
 const uint8_t MAX_RMT = 0;                  // No RMT channel on ESP8266
diff --git a/tasmota/include/tasmota_template.h b/tasmota/include/tasmota_template.h
index 3846ecc76..f89b99868 100644
--- a/tasmota/include/tasmota_template.h
+++ b/tasmota/include/tasmota_template.h
@@ -499,6 +499,11 @@ const char kSensorNamesFixed[] PROGMEM =
   D_SENSOR_USER;
 
 // Max number of GPIOs
+#define MAX_I2C          0              // Display no index if one bus
+#ifdef USE_I2C_BUS2
+#undef MAX_I2C
+#define MAX_I2C          2
+#endif
 #define MAX_MAX31855S    6
 #define MAX_MAX31865S    6
 #define MAX_MCP23XXX     6
diff --git a/tasmota/my_user_config.h b/tasmota/my_user_config.h
index a9f454770..b1f3b1330 100644
--- a/tasmota/my_user_config.h
+++ b/tasmota/my_user_config.h
@@ -603,6 +603,7 @@
 #define I2CDRIVERS_64_95       0xFFFFFFFF          // Enable I2CDriver64 to I2CDriver95
 
 #ifdef USE_I2C
+//  #define USE_I2C_BUS2                           // Add experimental support for second I2C bus on ESP8266 (+0k6k code)
 //  #define USE_SHT                                // [I2cDriver8] Enable SHT1X sensor (+1k4 code)
 //  #define USE_HTU                                // [I2cDriver9] Enable HTU21/SI7013/SI7020/SI7021 sensor (I2C address 0x40) (+1k5 code)
 //  #define USE_BMP                                // [I2cDriver10] Enable BMP085/BMP180/BMP280/BME280 sensors (I2C addresses 0x76 and 0x77) (+4k4 code)
diff --git a/tasmota/tasmota.ino b/tasmota/tasmota.ino
index e93e4c7eb..98e34586a 100644
--- a/tasmota/tasmota.ino
+++ b/tasmota/tasmota.ino
@@ -313,8 +313,8 @@ struct TasmotaGlobal_t {
   bool blinkstate;                          // LED state
   bool pwm_present;                         // Any PWM channel configured with SetOption15 0
   bool i2c_enabled;                         // I2C configured
+  bool i2c_enabled_2;                       // I2C configured, second controller, Wire1
 #ifdef ESP32
-  bool i2c_enabled_2;                       // I2C configured, second controller on ESP32, Wire1
   bool ota_factory;                         // Select safeboot binary
 #endif
   bool ntp_force_sync;                      // Force NTP sync
@@ -501,9 +501,9 @@ void setup(void) {
     TasConsole.println();
     AddLog(LOG_LEVEL_INFO, PSTR("CMD: Using USB CDC"));
   } else {
-    #if SOC_USB_SERIAL_JTAG_SUPPORTED  // Not S2
+#if SOC_USB_SERIAL_JTAG_SUPPORTED  // Not S2
     HWCDCSerial.~HWCDC();       // not needed, deinit CDC
-    #endif  // SOC_USB_SERIAL_JTAG_SUPPORTED
+#endif  // SOC_USB_SERIAL_JTAG_SUPPORTED
     // Init command serial console preparing for AddLog use
     Serial.begin(TasmotaGlobal.baudrate);
     Serial.println();
diff --git a/tasmota/tasmota_support/support_a_i2c.ino b/tasmota/tasmota_support/support_a_i2c.ino
index 8adabdba1..4a6aef726 100644
--- a/tasmota/tasmota_support/support_a_i2c.ino
+++ b/tasmota/tasmota_support/support_a_i2c.ino
@@ -11,49 +11,88 @@
  * Basic I2C routines supporting two busses
 \*********************************************************************************************/
 
+#ifdef ESP8266
+#ifdef USE_I2C_BUS2
+#define USE_I2C_BUS2_ESP8266
+#endif  // USE_I2C_BUS2_ESP8266
+#endif  // ESP8266
+
+#ifdef ESP32
+#define USE_I2C_BUS2
+#endif
+
 const uint8_t I2C_RETRY_COUNTER = 3;
 
-#ifdef ESP8266
-uint32_t i2c_active[1][4] = { 0 };
-#else
-uint32_t i2c_active[2][4] = { 0 };
-#endif
-uint32_t i2c_buffer = 0;
-
 struct I2Ct {
+  uint32_t buffer;
   uint32_t frequency[2];
+#ifdef USE_I2C_BUS2
+  uint32_t active[2][4];
+#else
+  uint32_t active[1][4];
+#endif  // No USE_I2C_BUS2
+#ifdef USE_I2C_BUS2_ESP8266
   int8_t sda[2];
   int8_t scl[2];
-  int8_t active_bus;
+  int8_t active_bus = -1;
+#endif  // USE_I2C_BUS2_ESP8266
 } I2C;
 
+#ifdef USE_I2C_BUS2_ESP8266
+TwoWire Wire1 = Wire;                                     // Not really backward compatible with ESP32
+
+void I2cSetBus(uint32_t bus = 0);
+void I2cSetBus(uint32_t bus) {
+  if (I2C.active_bus != bus) {
+    I2C.active_bus = bus;
+    Wire.begin(I2C.sda[bus], I2C.scl[bus]);
+    Wire.setClock(I2C.frequency[bus]);
+  }
+}
+#endif  // USE_I2C_BUS2_ESP8266
+
 bool I2cBegin(int sda, int scl, uint32_t bus = 0, uint32_t frequency = 100000);
 bool I2cBegin(int sda, int scl, uint32_t bus, uint32_t frequency) {
   I2C.frequency[bus] = frequency;
   bool result = true;
 #ifdef ESP8266
+#ifdef USE_I2C_BUS2_ESP8266
+  I2C.sda[bus] = sda;
+  I2C.scl[bus] = scl;
+  I2cSetBus();
+#else
+  if (bus > 0) { return false; }
   Wire.begin(sda, scl);
   Wire.setClock(frequency);
-#endif
+#endif  // USE_I2C_BUS2_ESP8266
+#endif  // ESP8266
 #ifdef ESP32
-  static bool reinit = false;
   TwoWire& myWire = (0 == bus) ? Wire : Wire1;
+  static bool reinit = false;
   if (reinit) { myWire.end(); }
   result = myWire.begin(sda, scl, frequency);
   reinit = result;
-#endif
+#endif  // ESP32
 //  AddLog(LOG_LEVEL_DEBUG, PSTR("I2C: Bus%d %d"), bus +1, result);
   return result;
 }
 
 TwoWire& I2cGetWire(uint8_t bus = 0) {
   if ((0 == bus) && TasmotaGlobal.i2c_enabled) {
+#ifdef USE_I2C_BUS2_ESP8266
+    I2cSetBus(bus);
+#endif
     return Wire;
-#ifdef ESP32
-  } else if ((1 == bus) && TasmotaGlobal.i2c_enabled_2) {
+  }
+#ifdef USE_I2C_BUS2
+  else if ((1 == bus) && TasmotaGlobal.i2c_enabled_2) {
+#ifdef USE_I2C_BUS2_ESP8266
+    I2cSetBus(bus);
+#endif
     return Wire1;
-#endif  // ESP32
-  } else {
+  }
+#endif  // USE_I2C_BUS2
+  else {
 //    AddLog(LOG_LEVEL_ERROR, PSTR("I2C: bus%d not initialized"), bus +1);
     return *(TwoWire*)nullptr;
   }
@@ -82,7 +121,7 @@ bool I2cSetClock(uint32_t frequency, uint32_t bus) {
 \*-------------------------------------------------------------------------------------------*/
 
 bool I2cValidRead(uint8_t addr, uint8_t reg, uint8_t size, uint8_t bus = 0, bool sendStop = false) {
-  i2c_buffer = 0;
+  I2C.buffer = 0;
 
   TwoWire& myWire = I2cGetWire(bus);
   if (&myWire == nullptr) { return false; }               // No valid I2c bus
@@ -96,7 +135,7 @@ bool I2cValidRead(uint8_t addr, uint8_t reg, uint8_t size, uint8_t bus = 0, bool
       myWire.requestFrom((int)addr, (int)size);           // send data n-bytes read
       if (myWire.available() == size) {
         for (uint32_t i = 0; i < size; i++) {
-          i2c_buffer = i2c_buffer << 8 | myWire.read();   // receive DATA
+          I2C.buffer = I2C.buffer << 8 | myWire.read();   // receive DATA
         }
         status = true;                                    // 1 = OK
       }
@@ -104,24 +143,27 @@ bool I2cValidRead(uint8_t addr, uint8_t reg, uint8_t size, uint8_t bus = 0, bool
     retry--;
   }
   if (!retry) myWire.endTransmission();
+#ifdef USE_I2C_BUS2_ESP8266
+  I2cSetBus();
+#endif
   return status;                                          // 0 = Error, 1 = OK
 }
 
 bool I2cValidRead8(uint8_t *data, uint8_t addr, uint8_t reg, uint8_t bus = 0) {
   bool status = I2cValidRead(addr, reg, 1, bus);
-  *data = (uint8_t)i2c_buffer;
+  *data = (uint8_t)I2C.buffer;
   return status;                                          // 0 = Error, 1 = OK
 }
 
 bool I2cValidRead16(uint16_t *data, uint8_t addr, uint8_t reg, uint8_t bus = 0) {
   bool status = I2cValidRead(addr, reg, 2, bus);
-  *data = (uint16_t)i2c_buffer;
+  *data = (uint16_t)I2C.buffer;
   return status;                                          // 0 = Error, 1 = OK
 }
 
 bool I2cValidReadS16(int16_t *data, uint8_t addr, uint8_t reg, uint8_t bus = 0) {
   bool status = I2cValidRead(addr, reg, 2, bus);
-  *data = (int16_t)i2c_buffer;
+  *data = (int16_t)I2C.buffer;
   return status;                                          // 0 = Error, 1 = OK
 }
 
@@ -141,28 +183,28 @@ bool I2cValidReadS16_LE(int16_t *data, uint8_t addr, uint8_t reg, uint8_t bus =
 
 bool I2cValidRead24(int32_t *data, uint8_t addr, uint8_t reg, uint8_t bus = 0) {
   bool status = I2cValidRead(addr, reg, 3, bus);
-  *data = i2c_buffer;
+  *data = I2C.buffer;
   return status;                                          // 0 = Error, 1 = OK
 }
 
 uint8_t I2cRead8(uint8_t addr, uint8_t reg, uint8_t bus = 0) {
   I2cValidRead(addr, reg, 1, bus);
-  return (uint8_t)i2c_buffer;
+  return (uint8_t)I2C.buffer;
 }
 
 uint16_t I2cRead16(uint8_t addr, uint8_t reg, uint8_t bus = 0) {
   I2cValidRead(addr, reg, 2, bus);
-  return (uint16_t)i2c_buffer;
+  return (uint16_t)I2C.buffer;
 }
 
 int16_t I2cReadS16(uint8_t addr, uint8_t reg, uint8_t bus = 0) {
   I2cValidRead(addr, reg, 2, bus);
-  return (int16_t)i2c_buffer;
+  return (int16_t)I2C.buffer;
 }
 
 uint16_t I2cRead16LE(uint8_t addr, uint8_t reg, uint8_t bus = 0) {
   I2cValidRead(addr, reg, 2, bus);
-  uint16_t temp = (uint16_t)i2c_buffer;
+  uint16_t temp = (uint16_t)I2C.buffer;
   return (temp >> 8) | (temp << 8);
 }
 
@@ -172,7 +214,7 @@ int16_t I2cReadS16_LE(uint8_t addr, uint8_t reg, uint8_t bus = 0) {
 
 int32_t I2cRead24(uint8_t addr, uint8_t reg, uint8_t bus = 0) {
   I2cValidRead(addr, reg, 3, bus);
-  return i2c_buffer;
+  return I2C.buffer;
 }
 
 /*-------------------------------------------------------------------------------------------*/
@@ -191,6 +233,9 @@ bool I2cWrite(uint8_t addr, uint8_t reg, uint32_t val, uint8_t size, uint8_t bus
     }
     x--;
   } while (myWire.endTransmission(true) != 0 && x != 0);  // end transmission
+#ifdef USE_I2C_BUS2_ESP8266
+  I2cSetBus();
+#endif
   return (x);                                             // 0 = Error, 1 = OK
 }
 
@@ -216,12 +261,18 @@ bool I2cReadBuffer0(uint8_t addr, uint8_t *reg_data, uint16_t len, uint8_t bus =
 
   myWire.requestFrom((uint8_t)addr, (uint8_t)len);
   if (myWire.available() != len) {
+#ifdef USE_I2C_BUS2_ESP8266
+    I2cSetBus();
+#endif
     return true;                                          // 1 = Error
   }
   while (len--) {
     *reg_data = (uint8_t)myWire.read();
     reg_data++;
   }
+#ifdef USE_I2C_BUS2_ESP8266
+  I2cSetBus();
+#endif
   return false;                                           // 0 = OK
 }
 
@@ -238,6 +289,9 @@ bool I2cReadBuffer(uint8_t addr, int reg, uint8_t *reg_data, uint16_t len, uint8
     myWire.endTransmission();
   }
   if (len != myWire.requestFrom((uint8_t)addr, (uint8_t)len)) {
+#ifdef USE_I2C_BUS2_ESP8266
+    I2cSetBus();
+#endif
     return true;                                          // 1 = Error
   }
   while (len--) {
@@ -247,6 +301,9 @@ bool I2cReadBuffer(uint8_t addr, int reg, uint8_t *reg_data, uint16_t len, uint8
   if (reg < 0) { 
     myWire.endTransmission();
   }
+#ifdef USE_I2C_BUS2_ESP8266
+  I2cSetBus();
+#endif
   return false;                                           // 0 = OK
 }
 
@@ -261,6 +318,9 @@ bool I2cWriteBuffer(uint8_t addr, uint8_t reg, uint8_t *reg_data, uint16_t len,
     reg_data++;
   }
   myWire.endTransmission();
+#ifdef USE_I2C_BUS2_ESP8266
+  I2cSetBus();
+#endif
   return false;                                           // 0 = OK
 }
 
@@ -283,11 +343,11 @@ void I2cScan(uint8_t bus = 0) {
   // 5: timeout
   TwoWire& myWire = I2cGetWire(bus);
   if (&myWire == nullptr) { return; }  // No valid I2c bus
-#ifdef ESP32
-  Response_P(PSTR("{\"" D_CMND_I2CSCAN "\":\"Device(s) found on bus%d at"), bus +1);
-#else
-  Response_P(PSTR("{\"" D_CMND_I2CSCAN "\":\"Device(s) found at"));
+  Response_P(PSTR("{\"" D_CMND_I2CSCAN "\":\"Device(s) found "));
+#ifdef USE_I2C_BUS2
+  ResponseAppend_P(PSTR("on bus%d "), bus +1);
 #endif
+  ResponseAppend_P(PSTR("at"));
 
   uint8_t error = 0;
   uint8_t address = 0;
@@ -302,14 +362,15 @@ void I2cScan(uint8_t bus = 0) {
     else if (error != 2) {  // Seems to happen anyway using this scan
       any = 2;
       Response_P(PSTR("{\"" D_CMND_I2CSCAN "\":\"Error %d at 0x%02x"), error, address);
-#ifdef ESP32
-      if (bus) {
-        ResponseAppend_P(PSTR(" (bus2)"));
-      }
-#endif
+#ifdef USE_I2C_BUS2
+      ResponseAppend_P(PSTR(" (bus%d)"), bus +1);
+#endif  // USE_I2C_BUS2
       break;
     }
   }
+#ifdef USE_I2C_BUS2_ESP8266
+  I2cSetBus();
+#endif
   if (any) {
     ResponseAppend_P(PSTR("\"}"));
   } else {
@@ -318,66 +379,50 @@ void I2cScan(uint8_t bus = 0) {
 }
 
 void I2cResetActive(uint32_t addr, uint8_t bus = 0) {
-#ifdef ESP8266
-  bus = 0;
-#endif
   addr &= 0x7F;         // Max I2C address is 127
-  i2c_active[bus][addr / 32] &= ~(1 << (addr % 32));
+  I2C.active[bus][addr / 32] &= ~(1 << (addr % 32));
 
 //  AddLog(LOG_LEVEL_DEBUG, PSTR("I2C: I2cResetActive bus0 %08X-%08X-%08X-%08X, bus1 %08X-%08X-%08X-%08X"),
-//    i2c_active[0][0], i2c_active[0][1], i2c_active[0][2], i2c_active[0][3],
-//    i2c_active[1][0], i2c_active[1][1], i2c_active[1][2], i2c_active[1][3]);
+//    I2C.active[0][0], I2C.active[0][1], I2C.active[0][2], I2C.active[0][3],
+//    I2C.active[1][0], I2C.active[1][1], I2C.active[1][2], I2C.active[1][3]);
 }
 
 void I2cSetActive(uint32_t addr, uint8_t bus = 0) {
-#ifdef ESP8266
-  bus = 0;
-#endif
   addr &= 0x7F;         // Max I2C address is 127
-  i2c_active[bus][addr / 32] |= (1 << (addr % 32));
+  I2C.active[bus][addr / 32] |= (1 << (addr % 32));
 
 //  AddLog(LOG_LEVEL_DEBUG, PSTR("I2C: I2cSetActive addr %02X, bus%d, bus0 %08X-%08X-%08X-%08X, bus1 %08X-%08X-%08X-%08X"),
 //    addr, bus,
-//    i2c_active[0][0], i2c_active[0][1], i2c_active[0][2], i2c_active[0][3],
-//    i2c_active[1][0], i2c_active[1][1], i2c_active[1][2], i2c_active[1][3]);
+//    I2C.active[0][0], I2C.active[0][1], I2C.active[0][2], I2C.active[0][3],
+//    I2C.active[1][0], I2C.active[1][1], I2C.active[1][2], I2C.active[1][3]);
 }
 
 void I2cSetActiveFound(uint32_t addr, const char *types, uint8_t bus = 0) {
   I2cSetActive(addr, bus);
-#ifdef ESP32
-  if (bus) {
-    AddLog(LOG_LEVEL_INFO, PSTR("I2C: %s found at 0x%02x (bus2)"), types, addr);
-  } else
-#endif // ESP32
-  AddLog(LOG_LEVEL_INFO, PSTR("I2C: %s found at 0x%02x"), types, addr);
+  AddLog(LOG_LEVEL_INFO, PSTR("I2C: %s found at 0x%02x%s"), types, addr, (bus)?" (bus2)":"");
 }
 
 bool I2cActive(uint32_t addr, uint8_t bus = 0) {
-#ifdef ESP8266
-  bus = 0;
-#endif
   addr &= 0x7F;         // Max I2C address is 127
-  return (i2c_active[bus][addr / 32] & (1 << (addr % 32)));
+  return (I2C.active[bus][addr / 32] & (1 << (addr % 32)));
 }
 
 bool I2cSetDevice(uint32_t addr, uint8_t bus = 0) {
-  TwoWire& myWire = I2cGetWire(bus);
-  if (&myWire == nullptr) { return false; }  // No valid I2c bus
-
   addr &= 0x7F;         // Max I2C address is 127
   if (I2cActive(addr, bus)) {
     return false;       // If already active report as not present;
   }
+
+  TwoWire& myWire = I2cGetWire(bus);
+  if (&myWire == nullptr) { return false; }  // No valid I2c bus
   myWire.beginTransmission((uint8_t)addr);
 //  return (0 == myWire.endTransmission());
   uint32_t err = myWire.endTransmission();
-  if (err && (err != 2)) {
-#ifdef ESP32
-    if (bus) {
-      AddLog(LOG_LEVEL_DEBUG, PSTR("I2C: Error %d at 0x%02x (bus2)"), err, addr);
-    } else
+#ifdef USE_I2C_BUS2_ESP8266
+  I2cSetBus();
 #endif
-    AddLog(LOG_LEVEL_DEBUG, PSTR("I2C: Error %d at 0x%02x"), err, addr);
+  if (err && (err != 2)) {
+    AddLog(LOG_LEVEL_DEBUG, PSTR("I2C: Error %d at 0x%02x%s"), err, addr, (bus)?" (bus2)":"");
   }
   return (0 == err);
 }
diff --git a/tasmota/tasmota_support/support_command.ino b/tasmota/tasmota_support/support_command.ino
index df3aee299..7a285b0ab 100644
--- a/tasmota/tasmota_support/support_command.ino
+++ b/tasmota/tasmota_support/support_command.ino
@@ -2751,14 +2751,14 @@ void CmndI2cScan(void) {
     I2cScan();
     jsflag = true;
   }
-#ifdef ESP32
+#ifdef USE_I2C_BUS2
   if (TasmotaGlobal.i2c_enabled_2) {
     if (jsflag) {
       MqttPublishPrefixTopicRulesProcess_P(RESULT_OR_STAT, XdrvMailbox.command);
     }
     I2cScan(1);
   }
-#endif  // ESP32
+#endif  // USE_I2C_BUS2
 }
 
 void CmndI2cDriver(void)
diff --git a/tasmota/tasmota_support/support_tasmota.ino b/tasmota/tasmota_support/support_tasmota.ino
index 11c722adb..aa57a47af 100644
--- a/tasmota/tasmota_support/support_tasmota.ino
+++ b/tasmota/tasmota_support/support_tasmota.ino
@@ -2232,6 +2232,7 @@ void GpioInit(void)
   }
 
 #ifdef USE_I2C
+/*
   if (PinUsed(GPIO_I2C_SCL) && PinUsed(GPIO_I2C_SDA)) {
     TasmotaGlobal.i2c_enabled = I2cBegin(Pin(GPIO_I2C_SDA), Pin(GPIO_I2C_SCL));
 #ifdef ESP32
@@ -2248,6 +2249,26 @@ void GpioInit(void)
     }
   }
 #endif
+*/
+  uint32_t max_bus = 1;
+#ifdef USE_I2C_BUS2
+  max_bus = 2;
+#endif  // USE_I2C_BUS2
+  for (uint32_t bus = 0; bus < max_bus; bus++) {
+    if (PinUsed(GPIO_I2C_SCL, bus) && PinUsed(GPIO_I2C_SDA, bus)) {
+      if (I2cBegin(Pin(GPIO_I2C_SDA, bus), Pin(GPIO_I2C_SCL, bus), bus)) {
+        if (0 == bus) { 
+          TasmotaGlobal.i2c_enabled = true;
+        }
+#ifdef USE_I2C_BUS2
+        else { 
+          TasmotaGlobal.i2c_enabled_2 = true;
+        }
+        AddLog(LOG_LEVEL_INFO, PSTR("I2C: Bus%d using GPIO%02d(SCL) and GPIO%02d(SDA)"), bus +1, Pin(GPIO_I2C_SCL, bus), Pin(GPIO_I2C_SDA, bus));
+#endif  // USE_I2C_BUS2
+      }
+    }
+  }
 #endif  // USE_I2C
 
   TasmotaGlobal.devices_present = 0;
diff --git a/tasmota/tasmota_xdrv_driver/xdrv_52_3_berry_wire.ino b/tasmota/tasmota_xdrv_driver/xdrv_52_3_berry_wire.ino
index b5638529d..5cce357ee 100644
--- a/tasmota/tasmota_xdrv_driver/xdrv_52_3_berry_wire.ino
+++ b/tasmota/tasmota_xdrv_driver/xdrv_52_3_berry_wire.ino
@@ -243,7 +243,7 @@ extern "C" {
       }
       bool ok = I2cValidRead(addr, reg, size, bus, true);  // force sendStop
       if (ok) {
-        int32_t val = i2c_buffer;
+        int32_t val = I2C.buffer;
         if (little_endian) {
           if (size == 2) {
             val = __bswap_16(val);
diff --git a/tasmota/tasmota_xsns_sensor/xsns_09_bmp.ino b/tasmota/tasmota_xsns_sensor/xsns_09_bmp.ino
index 5dc0d7197..cec135d79 100644
--- a/tasmota/tasmota_xsns_sensor/xsns_09_bmp.ino
+++ b/tasmota/tasmota_xsns_sensor/xsns_09_bmp.ino
@@ -558,7 +558,7 @@ void BmpShow(bool json) {
       if (bmp_count > 1) {
         // BMP280-77
         snprintf_P(name, sizeof(name), PSTR("%s%c%02X"), name, IndexSeparator(), bmp_sensors[bmp_idx].bmp_address);
-#ifdef ESP32
+#ifdef USE_I2C_BUS2
         if (TasmotaGlobal.i2c_enabled_2) {           // Second bus enabled
           uint8_t bus = bmp_sensors[0].bmp_bus;
           for (uint32_t i = 1; i < bmp_count; i++) {
@@ -569,7 +569,7 @@ void BmpShow(bool json) {
             }
           }
         }
-#endif
+#endif  // USE_I2C_BUS2
       }
 
       char pressure[33];
diff --git a/tasmota/tasmota_xsns_sensor/xsns_12_ads1115.ino b/tasmota/tasmota_xsns_sensor/xsns_12_ads1115.ino
index 11dbda0f9..53006b02b 100644
--- a/tasmota/tasmota_xsns_sensor/xsns_12_ads1115.ino
+++ b/tasmota/tasmota_xsns_sensor/xsns_12_ads1115.ino
@@ -199,7 +199,7 @@ void Ads1115Label(char* label, uint32_t maxsize, uint32_t device) {
   if (ads1115_count > 1) {
     // "ADS1115-48":{"A0":3240,"A1":3235,"A2":3269,"A3":3269},"ADS1115-49":{"A0":3240,"A1":3235,"A2":3269,"A3":3269}
     snprintf_P(label, maxsize, PSTR("%s%c%02X"), label, IndexSeparator(), Ads1115[device].address);
-#ifdef ESP32
+#ifdef USE_I2C_BUS2
     if (TasmotaGlobal.i2c_enabled_2) {           // Second bus enabled
       uint8_t bus = Ads1115[0].bus;
       for (uint32_t i = 1; i < ads1115_count; i++) {
@@ -210,7 +210,7 @@ void Ads1115Label(char* label, uint32_t maxsize, uint32_t device) {
         }
       }
     }
-#endif
+#endif  // USE_I2C_BUS2
   }
 }
 
diff --git a/tasmota/tasmota_xsns_sensor/xsns_14_sht3x.ino b/tasmota/tasmota_xsns_sensor/xsns_14_sht3x.ino
index c852a3f40..7b8c5bfba 100644
--- a/tasmota/tasmota_xsns_sensor/xsns_14_sht3x.ino
+++ b/tasmota/tasmota_xsns_sensor/xsns_14_sht3x.ino
@@ -191,7 +191,7 @@ void Sht3xShow(bool json) {
       strlcpy(types, sht3x_sensors[idx].types, sizeof(types));
       if (sht3x_count > 1) {
         snprintf_P(types, sizeof(types), PSTR("%s%c%02X"), types, IndexSeparator(), sht3x_sensors[idx].address);  // "SHT3X-0xXX"  
-#ifdef ESP32
+#ifdef USE_I2C_BUS2
         if (TasmotaGlobal.i2c_enabled_2) {
           for (uint32_t i = 1; i < sht3x_count; i++) {
             if (sht3x_sensors[0].bus != sht3x_sensors[i].bus) {
@@ -200,7 +200,7 @@ void Sht3xShow(bool json) {
             }
           }
         }
-#endif
+#endif  // USE_I2C_BUS2
       }
       TempHumDewShow(json, ((0 == TasmotaGlobal.tele_period) && (0 == idx)), types, sht3x_sensors[idx].temp, sht3x_sensors[idx].humi);
     }
diff --git a/tasmota/tasmota_xx2c_global/xx2c_interface.ino b/tasmota/tasmota_xx2c_global/xx2c_interface.ino
index 55e8a1a0a..7979886da 100644
--- a/tasmota/tasmota_xx2c_global/xx2c_interface.ino
+++ b/tasmota/tasmota_xx2c_global/xx2c_interface.ino
@@ -413,11 +413,11 @@ const uint8_t kI2cList[] = {
 /*********************************************************************************************/
 
 bool I2cEnabled(uint32_t i2c_index) {
-#ifdef ESP8266
-  return (TasmotaGlobal.i2c_enabled && bitRead(Settings->i2c_drivers[i2c_index / 32], i2c_index % 32));
-#else  
-  return ((TasmotaGlobal.i2c_enabled || TasmotaGlobal.i2c_enabled_2) && bitRead(Settings->i2c_drivers[i2c_index / 32], i2c_index % 32));
+  return ((TasmotaGlobal.i2c_enabled
+#ifdef USE_I2C_BUS2
+   || TasmotaGlobal.i2c_enabled_2
 #endif
+   ) && bitRead(Settings->i2c_drivers[i2c_index / 32], i2c_index % 32));
 }
 
 void I2cDriverState(void) {