diff --git a/firmware/controllers/algo/engine_state.txt b/firmware/controllers/algo/engine_state.txt
index bdec51281f..c9f7c809f6 100644
--- a/firmware/controllers/algo/engine_state.txt
+++ b/firmware/controllers/algo/engine_state.txt
@@ -41,6 +41,8 @@ struct_no_prefix engine_state_s
 	bit startStopPhysicalState
 	bit acrStateDup
 	bit acrEngineMovedRecently
+	! same field is used for narrow band heater enable and wide band enable via CAN
+	bit heaterControlEnabled
 	uint32_t startStopStateToggleCounter
 
 	float egtValue1
diff --git a/firmware/controllers/sensors/wideband_state.txt b/firmware/controllers/sensors/wideband_state.txt
index 9edb18a5c5..201b229d94 100644
--- a/firmware/controllers/sensors/wideband_state.txt
+++ b/firmware/controllers/sensors/wideband_state.txt
@@ -1,4 +1,5 @@
 struct_no_prefix wideband_state_s
+! see also 'Fault' enum in wideband source code
 	uint8_t faultCode;WBO: Fault code
 
 	uint8_t heaterDuty;WBO: Heater duty;"%", 1, 0, 0, 100, 0
diff --git a/firmware/tunerstudio/rusefi.input b/firmware/tunerstudio/rusefi.input
index 0c7140b20b..30b2c008b8 100644
--- a/firmware/tunerstudio/rusefi.input
+++ b/firmware/tunerstudio/rusefi.input
@@ -231,7 +231,7 @@ enable2ndByteCanID = false
 	debugFieldI4List = bits,	U08,	[0:7], "Alt: Period",				"",						"",			"Idle: State",						"Idle di4",				"Cycle Cnt 1",					"",			"",								"",						"",							"",						"",		"",			"",			"",				"",			"",						"ETB di4",					"executor",			"",			"di4",			"di4",			"22di4",			"",		"24:di4",		"",				"",			"",				"",		"",	"",	"Init Count",	"",							"",	"",		"",		"",""					"",			"",					"",				"",			"",				"",										"",			"",					"",						"Solenoid 4 State",  "",					"",							"",							""
 	debugFieldI5List = bits,	U08,	[0:7], "",								"",						"",			"",										"Idle di5",				"Cycle Cnt 2",					"",			"",								"",						"",							"",						"",		"",			"",			"",				"di5",		"di5",					"ETB di5",					"max executor",		"di5",		"di5",			"di5",			"22di5",			"di5",	"di5",		"di5",				"di5",		"di5",			"",		"di5",  "di5",  "di5",				"",							"di5", "di5",	"di5",	"",""					"",			"",					"",				"",			"",				"",										"",			"",					"",						"Solenoid 5 State",  "",					"",							"",							""
 
-	wboFaultCodeList = bits, U08, [0:3], "OK", "silent", "Unk", "failed to heat", "overheat", "underheat", "no supply", "legacy"
+	wboFaultCodeList = bits, U08, [0:3], "OK", "silent", "cranking", "failed to heat", "overheat", "underheat", "no supply", "legacy"
 
 	injModeList = bits, U08, [0:3], "Simultaneous", "Sequential", "Batch", "Single Point"
 	ignModeList = bits, U08, [0:3], "Single Coil", "Sequential", "Wasted", "Two Coils"