diff --git a/Marlin/SanityCheck.h b/Marlin/SanityCheck.h
index 73d0fc57b2..19a78c4bf9 100644
--- a/Marlin/SanityCheck.h
+++ b/Marlin/SanityCheck.h
@@ -480,6 +480,8 @@ static_assert(1 >= 0
     #error "You probably want to use Max Endstops for DELTA!"
   #elif ENABLED(ENABLE_LEVELING_FADE_HEIGHT) && DISABLED(AUTO_BED_LEVELING_BILINEAR) && !UBL_DELTA
     #error "ENABLE_LEVELING_FADE_HEIGHT on DELTA requires AUTO_BED_LEVELING_BILINEAR or AUTO_BED_LEVELING_UBL."
+  #elif ENABLED(DELTA_AUTO_CALIBRATION) && !HAS_BED_PROBE
+    #error "DELTA_AUTO_CALIBRATION requires a probe: FIX_MOUNTED_PROBE, BLTOUCH, SOLENOID_PROBE, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, or Z Servo."
   #elif ABL_GRID
     #if (GRID_MAX_POINTS_X & 1) == 0 || (GRID_MAX_POINTS_Y & 1) == 0
       #error "DELTA requires GRID_MAX_POINTS_X and GRID_MAX_POINTS_Y to be odd numbers."
diff --git a/Marlin/gcode.h b/Marlin/gcode.h
index ac3268d7d4..aa51a57b01 100644
--- a/Marlin/gcode.h
+++ b/Marlin/gcode.h
@@ -144,10 +144,6 @@ public:
 
     #define SEEN_TEST(L) TEST(codebits[LETTER_IND(L)], LETTER_BIT(L))
 
-    // Seen any axis parameter
-    // Optimized by moving 'X' up to index 24
-    FORCE_INLINE bool seen_axis() { return codebits[3] || SEEN_TEST('E'); }
-
   #else // !FASTER_GCODE_PARSER
 
     // Code is found in the string. If not found, value_ptr is unchanged.
@@ -164,13 +160,13 @@ public:
 
     #define SEEN_TEST(L) !!strchr(command_args, L)
 
-    // Seen any axis parameter
-    static bool seen_axis() {
-      return SEEN_TEST('X') || SEEN_TEST('Y') || SEEN_TEST('Z') || SEEN_TEST('E');
-    }
-
   #endif // !FASTER_GCODE_PARSER
 
+  // Seen any axis parameter
+  static bool seen_axis() {
+    return SEEN_TEST('X') || SEEN_TEST('Y') || SEEN_TEST('Z') || SEEN_TEST('E');
+  }
+
   // Populate all fields by parsing a single line of GCode
   // This uses 54 bytes of SRAM to speed up seen/value
   static void parse(char * p);