diff --git a/firmware/config/engines/mercedes.cpp b/firmware/config/engines/mercedes.cpp
index fc2908fe2f..25253a653b 100644
--- a/firmware/config/engines/mercedes.cpp
+++ b/firmware/config/engines/mercedes.cpp
@@ -7,10 +7,15 @@
 
 #include "pch.h"
 
+// is this M104 or M112 or both?
 void setHellenMercedes128_6_cyl(DECLARE_CONFIG_PARAMETER_SIGNATURE) {
-
+	engineConfiguration->specs.cylindersCount = 6;
+	// 1-4-2-5-3-6 M104
+	engineConfiguration->specs.firingOrder = FO_1_4_3_6_2_5; // M112
 }
 
+// M113
 void setHellenMercedes128_8_cyl(DECLARE_CONFIG_PARAMETER_SIGNATURE) {
-
+	engineConfiguration->specs.cylindersCount = 8;
+	engineConfiguration->specs.firingOrder = FO_1_5_4_2_6_3_7_8;
 }
diff --git a/firmware/controllers/algo/engine_configuration.cpp b/firmware/controllers/algo/engine_configuration.cpp
index 76012cf6ee..c7f0403edd 100644
--- a/firmware/controllers/algo/engine_configuration.cpp
+++ b/firmware/controllers/algo/engine_configuration.cpp
@@ -57,6 +57,7 @@
 #include "mazda_miata_vvt.h"
 #include "mazda_626.h"
 #include "m111.h"
+#include "mercedes.h"
 
 #include "citroenBerlingoTU3JP.h"
 #include "mitsubishi.h"
@@ -859,8 +860,6 @@ void resetConfigurationExt(configuration_callback_t boardCallback, engine_type_e
 	case PROTEUS_DEFAULTS:
 	case PROMETHEUS_DEFAULTS:
 	case HELLEN_128_MERCEDES_4_CYL:
-	case HELLEN_128_MERCEDES_6_CYL:
-	case HELLEN_128_MERCEDES_8_CYL:
 	case MINIMAL_PINS:
 		// all basic settings are already set in prepareVoidConfiguration(), no need to set anything here
 		// nothing to do - we do it all in setBoardDefaultConfiguration
@@ -939,6 +938,12 @@ void resetConfigurationExt(configuration_callback_t boardCallback, engine_type_e
 #endif // HARDWARE_CI
 #endif // HW_PROTEUS
 #if HW_HELLEN
+	case HELLEN_128_MERCEDES_6_CYL:
+		setHellenMercedes128_6_cyl(PASS_CONFIG_PARAMETER_SIGNATURE);
+		break;
+	case HELLEN_128_MERCEDES_8_CYL:
+		setHellenMercedes128_8_cyl(PASS_CONFIG_PARAMETER_SIGNATURE);
+		break;
 	case HELLEN_NB2:
 		setMiataNB2_Hellen72(PASS_CONFIG_PARAMETER_SIGNATURE);
 		break;