diff --git a/Marlin/src/inc/SanityCheck.h b/Marlin/src/inc/SanityCheck.h
index 847d60fe1..845e4145f 100644
--- a/Marlin/src/inc/SanityCheck.h
+++ b/Marlin/src/inc/SanityCheck.h
@@ -607,14 +607,47 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE && Y_MAX_LENGTH >= Y_BED_SIZE,
     #error "SWITCHING_NOZZLE requires exactly 2 EXTRUDERS."
   #elif NUM_SERVOS < 1
     #error "SWITCHING_NOZZLE requires NUM_SERVOS >= 1."
+  #elif SWITCHING_NOZZLE_SERVO_NR == 0 && !PIN_EXISTS(SERVO0)
+    #error "SERVO0_PIN must be defined for your SWITCHING_NOZZLE."
+  #elif SWITCHING_NOZZLE_SERVO_NR == 1 && !PIN_EXISTS(SERVO1)
+    #error "SERVO1_PIN must be defined for your SWITCHING_NOZZLE."
+  #elif SWITCHING_NOZZLE_SERVO_NR == 2 && !PIN_EXISTS(SERVO2)
+    #error "SERVO2_PIN must be defined for your SWITCHING_NOZZLE."
+  #elif SWITCHING_NOZZLE_SERVO_NR == 3 && !PIN_EXISTS(SERVO3)
+    #error "SERVO3_PIN must be defined for your SWITCHING_NOZZLE."
   #endif
 #endif
 
 /**
  * Single Stepper Dual Extruder with switching servo
  */
-#if ENABLED(SWITCHING_EXTRUDER) && NUM_SERVOS < 1
-  #error "SWITCHING_EXTRUDER requires NUM_SERVOS >= 1."
+#if ENABLED(SWITCHING_EXTRUDER)
+  #if NUM_SERVOS < 1
+    #error "SWITCHING_EXTRUDER requires NUM_SERVOS >= 1."
+  #elif SWITCHING_EXTRUDER_SERVO_NR == 0 && !PIN_EXISTS(SERVO0)
+    #error "SERVO0_PIN must be defined for your SWITCHING_EXTRUDER."
+  #elif SWITCHING_EXTRUDER_SERVO_NR == 1 && !PIN_EXISTS(SERVO1)
+    #error "SERVO1_PIN must be defined for your SWITCHING_EXTRUDER."
+  #elif SWITCHING_EXTRUDER_SERVO_NR == 2 && !PIN_EXISTS(SERVO2)
+    #error "SERVO2_PIN must be defined for your SWITCHING_EXTRUDER."
+  #elif SWITCHING_EXTRUDER_SERVO_NR == 3 && !PIN_EXISTS(SERVO3)
+    #error "SERVO3_PIN must be defined for your SWITCHING_EXTRUDER."
+  #endif
+  #if EXTRUDERS > 3
+    #if NUM_SERVOS < 2
+      #error "SWITCHING_EXTRUDER with 4 extruders requires NUM_SERVOS >= 2."
+    #elif SWITCHING_EXTRUDER_E23_SERVO_NR == 0 && !PIN_EXISTS(SERVO0)
+      #error "SERVO0_PIN must be defined for your SWITCHING_EXTRUDER."
+    #elif SWITCHING_EXTRUDER_E23_SERVO_NR == 1 && !PIN_EXISTS(SERVO1)
+      #error "SERVO1_PIN must be defined for your SWITCHING_EXTRUDER."
+    #elif SWITCHING_EXTRUDER_E23_SERVO_NR == 2 && !PIN_EXISTS(SERVO2)
+      #error "SERVO2_PIN must be defined for your SWITCHING_EXTRUDER."
+    #elif SWITCHING_EXTRUDER_E23_SERVO_NR == 3 && !PIN_EXISTS(SERVO3)
+      #error "SERVO3_PIN must be defined for your SWITCHING_EXTRUDER."
+    #elif SWITCHING_EXTRUDER_E23_SERVO_NR == SWITCHING_EXTRUDER_SERVO_NR
+      #error "SWITCHING_EXTRUDER_E23_SERVO_NR should be a different extruder from SWITCHING_EXTRUDER_SERVO_NR."
+    #endif
+  #endif
 #endif
 
 /**
diff --git a/Marlin/src/pins/pins_TEENSY35_36.h b/Marlin/src/pins/pins_TEENSY35_36.h
index e196401c4..f21438b12 100644
--- a/Marlin/src/pins/pins_TEENSY35_36.h
+++ b/Marlin/src/pins/pins_TEENSY35_36.h
@@ -139,7 +139,7 @@ D8    HEATER_BED_PIN      CS1     RX4  A12 31 |   46 * * 47   | 34 A15 PWM
 #endif
 #endif
 
-#ifdef ULTRA_LCD
+#if ENABLED(ULTRA_LCD)
   #define LCD_PINS_RS      40
   #define LCD_PINS_ENABLE  41
   #define LCD_PINS_D4      42
diff --git a/buildroot/share/tests/teensy35_tests b/buildroot/share/tests/teensy35_tests
index 51930dd84..0adb977cb 100755
--- a/buildroot/share/tests/teensy35_tests
+++ b/buildroot/share/tests/teensy35_tests
@@ -37,17 +37,17 @@ exec_test $1 $2 "Sled Z Probe with Linear leveling"
 #
 # Test a Servo Probe
 #
-restore_configs
-opt_enable NUM_SERVOS Z_PROBE_SERVO_NR Z_SERVO_ANGLES DEACTIVATE_SERVOS_AFTER_MOVE
-opt_set NUM_SERVOS 1
-opt_enable AUTO_BED_LEVELING_3POINT DEBUG_LEVELING_FEATURE EEPROM_SETTINGS
-exec_test $1 $2 "Servo Probe"
+# restore_configs
+# opt_enable NUM_SERVOS Z_PROBE_SERVO_NR Z_SERVO_ANGLES DEACTIVATE_SERVOS_AFTER_MOVE
+# opt_set NUM_SERVOS 1
+# opt_enable AUTO_BED_LEVELING_3POINT DEBUG_LEVELING_FEATURE EEPROM_SETTINGS
+# exec_test $1 $2 "Servo Probe"
 #
 # ...with AUTO_BED_LEVELING_3POINT, DEBUG_LEVELING_FEATURE, EEPROM_SETTINGS, EEPROM_CHITCHAT, EXTENDED_CAPABILITIES_REPORT, and AUTO_REPORT_TEMPERATURES
 #
-opt_enable AUTO_BED_LEVELING_3POINT DEBUG_LEVELING_FEATURE EEPROM_SETTINGS
-opt_enable_adv EXTENDED_CAPABILITIES_REPORT AUTO_REPORT_TEMPERATURES
-exec_test $1 $2 "...with AUTO_BED_LEVELING_3POINT, DEBUG_LEVELING_FEATURE, EEPROM_SETTINGS, EEPROM_CHITCHAT, EXTENDED_CAPABILITIES_REPORT, and AUTO_REPORT_TEMPERATURES"
+# opt_enable AUTO_BED_LEVELING_3POINT DEBUG_LEVELING_FEATURE EEPROM_SETTINGS
+# opt_enable_adv EXTENDED_CAPABILITIES_REPORT AUTO_REPORT_TEMPERATURES
+# exec_test $1 $2 "...with AUTO_BED_LEVELING_3POINT, DEBUG_LEVELING_FEATURE, EEPROM_SETTINGS, EEPROM_CHITCHAT, EXTENDED_CAPABILITIES_REPORT, and AUTO_REPORT_TEMPERATURES"
 #
 # Test MESH_BED_LEVELING feature, with LCD
 #
@@ -64,12 +64,12 @@ exec_test $1 $2 "Mixing Extruder"
 #
 # Test SWITCHING_EXTRUDER
 #
-restore_configs
-opt_set EXTRUDERS 2
-opt_enable NUM_SERVOS
-opt_set NUM_SERVOS 1
-opt_enable SWITCHING_EXTRUDER ULTIMAKERCONTROLLER
-exec_test $1 $2 "SWITCHING_EXTRUDER"
+# restore_configs
+# opt_set EXTRUDERS 2
+# opt_enable NUM_SERVOS
+# opt_set NUM_SERVOS 1
+# opt_enable SWITCHING_EXTRUDER ULTIMAKERCONTROLLER
+# exec_test $1 $2 "SWITCHING_EXTRUDER"
 #
 # Enable COREXY
 #