From 73e939ffb5fa41be407812fa069be76f45d968e6 Mon Sep 17 00:00:00 2001
From: Jonathan Swoboda <154711427+swoboda1337@users.noreply.github.com>
Date: Fri, 27 Mar 2026 14:13:24 -0400
Subject: [PATCH] [sgp4x] Fix NOx index_offset default (should be 1, not 100)
 (#15212)

---
 esphome/components/sgp4x/sensor.py | 39 ++++++++++++++++++------------
 1 file changed, 23 insertions(+), 16 deletions(-)

diff --git a/esphome/components/sgp4x/sensor.py b/esphome/components/sgp4x/sensor.py
index ab78ab59d9..8d52ffb4f2 100644
--- a/esphome/components/sgp4x/sensor.py
+++ b/esphome/components/sgp4x/sensor.py
@@ -44,20 +44,27 @@ def validate_sensors(config):
     return config
 
 
-GAS_SENSOR = cv.Schema(
-    {
-        cv.Optional(CONF_ALGORITHM_TUNING): cv.Schema(
-            {
-                cv.Optional(CONF_INDEX_OFFSET, default=100): cv.int_,
-                cv.Optional(CONF_LEARNING_TIME_OFFSET_HOURS, default=12): cv.int_,
-                cv.Optional(CONF_LEARNING_TIME_GAIN_HOURS, default=12): cv.int_,
-                cv.Optional(CONF_GATING_MAX_DURATION_MINUTES, default=720): cv.int_,
-                cv.Optional(CONF_STD_INITIAL, default=50): cv.int_,
-                cv.Optional(CONF_GAIN_FACTOR, default=230): cv.int_,
-            }
-        )
-    }
-)
+def _gas_sensor_schema(index_offset_default: int):
+    return cv.Schema(
+        {
+            cv.Optional(CONF_ALGORITHM_TUNING): cv.Schema(
+                {
+                    cv.Optional(
+                        CONF_INDEX_OFFSET, default=index_offset_default
+                    ): cv.int_,
+                    cv.Optional(CONF_LEARNING_TIME_OFFSET_HOURS, default=12): cv.int_,
+                    cv.Optional(CONF_LEARNING_TIME_GAIN_HOURS, default=12): cv.int_,
+                    cv.Optional(CONF_GATING_MAX_DURATION_MINUTES, default=720): cv.int_,
+                    cv.Optional(CONF_STD_INITIAL, default=50): cv.int_,
+                    cv.Optional(CONF_GAIN_FACTOR, default=230): cv.int_,
+                }
+            )
+        }
+    )
+
+
+VOC_SENSOR = _gas_sensor_schema(100)
+NOX_SENSOR = _gas_sensor_schema(1)
 
 CONFIG_SCHEMA = cv.All(
     cv.Schema(
@@ -68,13 +75,13 @@ CONFIG_SCHEMA = cv.All(
                 accuracy_decimals=0,
                 device_class=DEVICE_CLASS_AQI,
                 state_class=STATE_CLASS_MEASUREMENT,
-            ).extend(GAS_SENSOR),
+            ).extend(VOC_SENSOR),
             cv.Optional(CONF_NOX): sensor.sensor_schema(
                 icon=ICON_RADIATOR,
                 accuracy_decimals=0,
                 device_class=DEVICE_CLASS_AQI,
                 state_class=STATE_CLASS_MEASUREMENT,
-            ).extend(GAS_SENSOR),
+            ).extend(NOX_SENSOR),
             cv.Optional(CONF_STORE_BASELINE, default=True): cv.boolean,
             cv.Optional(CONF_VOC_BASELINE): cv.hex_uint16_t,
             cv.Optional(CONF_COMPENSATION): cv.Schema(