diff --git a/firmware/controllers/trigger/trigger_decoder.h b/firmware/controllers/trigger/trigger_decoder.h
index 68d93057eb..4099d657ed 100644
--- a/firmware/controllers/trigger/trigger_decoder.h
+++ b/firmware/controllers/trigger/trigger_decoder.h
@@ -64,6 +64,8 @@ public:
 	 */
 	bool shaft_is_synchronized;
 
+	bool triggerDefinitionError;
+
 	uint32_t toothed_previous_duration; // todo: unify Camel_notation, what a mess :(
 	uint32_t durationBeforePrevious; // this one is before 'toothed_previous_duration'
 	uint32_t thirdPreviousDuration; // this one is before durationBeforePrevious, todo: better field names?
diff --git a/firmware/controllers/trigger/trigger_simulator.cpp b/firmware/controllers/trigger/trigger_simulator.cpp
index b46f8bde7e..d83495e6a1 100644
--- a/firmware/controllers/trigger/trigger_simulator.cpp
+++ b/firmware/controllers/trigger/trigger_simulator.cpp
@@ -62,9 +62,11 @@ void TriggerStimulatorHelper::assertSyncPositionAndSetDutyCycle(uint32_t index,
 		nextStep(state, shape, i, triggerConfig PASS_ENGINE_PARAMETER);
 	}
 	if (state->getTotalRevolutionCounter() != 3) {
-		firmwareError(OBD_PCM_Processor_Fault, "sync failed/wrong gap parameters trigger=%s", getTrigger_type_e(engineConfiguration->trigger.type));
+		warning(CUSTOM_OBD_80, "sync failed/wrong gap parameters trigger=%s", getTrigger_type_e(engineConfiguration->trigger.type));
+		state->triggerDefinitionError = true;
 		return;
 	}
+	state->triggerDefinitionError = false;
 
 	for (int i = 0; i < PWM_PHASE_MAX_WAVE_PER_PWM; i++) {
 		shape->dutyCycle[i] = 1.0 * state->expectedTotalTime[i] / SIMULATION_CYCLE_PERIOD;
diff --git a/firmware/controllers/trigger/trigger_structure.cpp b/firmware/controllers/trigger/trigger_structure.cpp
index e1f46541b1..52ed6f3310 100644
--- a/firmware/controllers/trigger/trigger_structure.cpp
+++ b/firmware/controllers/trigger/trigger_structure.cpp
@@ -165,7 +165,7 @@ TriggerState::TriggerState() {
 
 void TriggerState::reset() {
 	cycleCallback = NULL;
-	shaft_is_synchronized = false;
+	triggerDefinitionError = shaft_is_synchronized = false;
 	toothed_previous_time = 0;
 	toothed_previous_duration = 0;
 	durationBeforePrevious = 0;
diff --git a/firmware/integration/rusefi_config.txt b/firmware/integration/rusefi_config.txt
index d944424ef5..d56c8a902e 100644
--- a/firmware/integration/rusefi_config.txt
+++ b/firmware/integration/rusefi_config.txt
@@ -617,7 +617,7 @@ custom idle_mode_e 4 bits,    U32,   @OFFSET@, [0:0], "false", "true"
 	bit isPrintTriggerSynchDetails;+enable trigger_details
 	bit isManualSpinningMode;Usually if we have no trigger events that means engine is stopped\nUnless we are troubleshooting and spinning the engine by hand - this case a longer\ndelay is needed
 	bit twoWireBatchInjection;+This is needed if batched injection and individual injector wiring\nenable two_wire_batch_injection
-	bit useOnlyRisingEdgeForTrigger;+VR sensors are only precise on rising front
+	bit useOnlyRisingEdgeForTrigger;+VR sensors are only precise on rising front\nenable trigger_only_front
 	bit twoWireBatchIgnition;+This is needed if batched igniton (waster spark) and individual coil wiring
 
 
diff --git a/java_console/autotest/src/com/rusefi/AutoTest.java b/java_console/autotest/src/com/rusefi/AutoTest.java
index cb78d30aec..1aa617d0f9 100644
--- a/java_console/autotest/src/com/rusefi/AutoTest.java
+++ b/java_console/autotest/src/com/rusefi/AutoTest.java
@@ -45,6 +45,7 @@ public class AutoTest {
     private static void testCustomEngine() {
         setEngineType(0);
         sendCommand("set_toothed_wheel 4 0");
+//        sendCommand("enable trigger_only_front");
     }
 
     private static void testMazdaMiata2003() {