diff --git a/firmware/controllers/sensors/impl/AemXSeriesLambda.cpp b/firmware/controllers/sensors/impl/AemXSeriesLambda.cpp
index bf3d9950b1..5cd055d64d 100644
--- a/firmware/controllers/sensors/impl/AemXSeriesLambda.cpp
+++ b/firmware/controllers/sensors/impl/AemXSeriesLambda.cpp
@@ -16,7 +16,9 @@ AemXSeriesWideband::AemXSeriesWideband(uint8_t sensorIndex, SensorType type)
 		MS2NT(21)	// sensor transmits at 100hz, allow a frame to be missed
 	)
 	, m_sensorIndex(sensorIndex)
-{}
+{
+    faultCode = 1;// silent, initial state is "no one has spoken to us so far"
+}
 
 bool AemXSeriesWideband::acceptFrame(const CANRxFrame& frame) const {
 	if (frame.DLC != 8) {
diff --git a/firmware/tunerstudio/rusefi.input b/firmware/tunerstudio/rusefi.input
index 83950e2071..f8fe46d65d 100644
--- a/firmware/tunerstudio/rusefi.input
+++ b/firmware/tunerstudio/rusefi.input
@@ -238,7 +238,7 @@ 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", "Unk", "Unk", "failed to heat", "overheat", "underheat", "no supply", "legacy"
+	wboFaultCodeList = bits, U08, [0:3], "OK", "silent", "Unk", "failed to heat", "overheat", "underheat", "no supply", "legacy"
 
 ; ClearReason
 	fuelIgnCutCodeList = bits, U08, [0:7], "None", "fatal error", "setting disabled", "RPM limit", "fault RPM limit", "boost cut", "oil pressure", "stop requested", "ETB problem", "launch control", "max injector duty", "flood clear", "engine sync", "kickstart", "ign off", "Lua"