diff --git a/esphome/components/beken_spi_led_strip/led_strip.cpp b/esphome/components/beken_spi_led_strip/led_strip.cpp
index 67b84722573..f425f3ca5c4 100644
--- a/esphome/components/beken_spi_led_strip/led_strip.cpp
+++ b/esphome/components/beken_spi_led_strip/led_strip.cpp
@@ -78,7 +78,7 @@ static void spi_set_clock(uint32_t max_hz) {
   int source_clk = 0;
   int spi_clk = 0;
   int div = 0;
-  uint32_t param;
+  uint32_t param = PWD_SPI_CLK_BIT;
   if (max_hz > 4333000) {
     if (max_hz > 30000000) {
       spi_clk = 30000000;
diff --git a/esphome/components/iaqcore/iaqcore.cpp b/esphome/components/iaqcore/iaqcore.cpp
index 274f9086b69..c414eb8f608 100644
--- a/esphome/components/iaqcore/iaqcore.cpp
+++ b/esphome/components/iaqcore/iaqcore.cpp
@@ -10,11 +10,13 @@ static const char *const TAG = "iaqcore";
 
 enum IAQCoreErrorCode : uint8_t { ERROR_OK = 0, ERROR_RUNIN = 0x10, ERROR_BUSY = 0x01, ERROR_ERROR = 0x80 };
 
+static constexpr size_t SENSOR_DATA_LENGTH = 9;
+
 struct SensorData {
-  uint16_t co2;
-  IAQCoreErrorCode status;
   int32_t resistance;
+  uint16_t co2;
   uint16_t tvoc;
+  IAQCoreErrorCode status;
 
   SensorData(const uint8_t *buffer) {
     this->co2 = encode_uint16(buffer[0], buffer[1]);
@@ -33,9 +35,9 @@ void IAQCore::setup() {
 }
 
 void IAQCore::update() {
-  uint8_t buffer[sizeof(SensorData)];
+  uint8_t buffer[SENSOR_DATA_LENGTH];
 
-  if (this->read_register(0xB5, buffer, sizeof(buffer)) != i2c::ERROR_OK) {
+  if (this->read_register(0xB5, buffer, SENSOR_DATA_LENGTH) != i2c::ERROR_OK) {
     ESP_LOGD(TAG, "Read failed");
     this->status_set_warning();
     this->publish_nans_();
diff --git a/esphome/components/scd30/scd30.cpp b/esphome/components/scd30/scd30.cpp
index 3c2c06fd685..e61d0142be6 100644
--- a/esphome/components/scd30/scd30.cpp
+++ b/esphome/components/scd30/scd30.cpp
@@ -222,7 +222,7 @@ bool SCD30Component::force_recalibration_with_reference(uint16_t co2_reference)
 }
 
 uint16_t SCD30Component::get_forced_calibration_reference() {
-  uint16_t forced_calibration_reference;
+  uint16_t forced_calibration_reference = 0;
   // Get current CO2 calibration
   if (!this->get_register(SCD30_CMD_FORCED_CALIBRATION, forced_calibration_reference)) {
     ESP_LOGE(TAG, "Unable to read forced calibration reference.");
diff --git a/esphome/components/sen21231/sen21231.cpp b/esphome/components/sen21231/sen21231.cpp
index 67001c3f14b..8c9f3d71346 100644
--- a/esphome/components/sen21231/sen21231.cpp
+++ b/esphome/components/sen21231/sen21231.cpp
@@ -20,7 +20,12 @@ void Sen21231Sensor::dump_config() {
 
 void Sen21231Sensor::read_data_() {
   person_sensor_results_t results;
-  this->read_bytes(PERSON_SENSOR_I2C_ADDRESS, (uint8_t *) &results, sizeof(results));
+  if (!this->read_bytes(PERSON_SENSOR_I2C_ADDRESS, (uint8_t *) &results, sizeof(results))) {
+    ESP_LOGW(TAG, "Failed to read data from SEN21231");
+    this->status_set_warning();
+    return;
+  }
+  this->status_clear_warning();
   ESP_LOGD(TAG, "SEN21231: %d faces detected", results.num_faces);
   this->publish_state(results.num_faces);
   if (results.num_faces == 1) {