diff --git a/Software/data/index.htm b/Software/data/index.htm
index 419b0e0..f3c7934 100644
--- a/Software/data/index.htm
+++ b/Software/data/index.htm
@@ -75,13 +75,25 @@
           <table class="table">
             <tbody>
               <tr>
-                <th class="col-md-4" scope="col">Timestamp</th>
-                <th class="col-md-4" scope="col">DTC</th>
-                <th class="col-md-4" scope="col">active</th>
+                <th class="col-md-3" scope="col">Zeitstempel</th>
+                <th class="col-md-3" scope="col">Fehlercode</th>
+                <th class="col-md-3" scope="col">Schwere</th>
+                <th class="col-md-3" scope="col">Aktiv</th>
               </tr>
               %DTC_TABLE%
             </tbody>
           </table>
+          <p>
+            <button class="btn btn-primary" type="button" data-toggle="collapse" data-target="#collapseDTCDescription"
+              aria-expanded="false" aria-controls="collapseDTCDescription">
+              DTC Beschreibung
+            </button>
+          </p>
+          <div class="collapse" id="collapseDTCDescription">
+            <div class="card card-body">
+              <embed type="text/html" src="static/dtc.txt" width="100&#37;">
+            </div>
+          </div>
         </div>
         </p>
       </div>
diff --git a/Software/data/static/dtc.txt b/Software/data/static/dtc.txt
new file mode 100644
index 0000000..fc23474
--- /dev/null
+++ b/Software/data/static/dtc.txt
@@ -0,0 +1,12 @@
+1 - TANK_EMPTY
+2 - DTC_TANK_LOW
+3 - DTC_NO_EEPROM_FOUND
+4 - DTC_EEPROM_CFG_BAD
+5 - DTC_EEPROM_PDS_BAD
+6 - DTC_EEPROM_PDSADRESS_BAD
+7 - DTC_EEPROM_VERSION_BAD
+8 - DTC_FLASHFS_ERROR
+9 - DTC_FLASHFS_VERSION_ERROR
+10 - DTC_NO_GPS_SERIAL
+11 - DTC_CAN_TRANSCEIVER_FAILED
+12 - DTC_NO_CAN_SIGNAL
diff --git a/Software/data/static/img/critical.png b/Software/data/static/img/critical.png
new file mode 100644
index 0000000..82325ff
Binary files /dev/null and b/Software/data/static/img/critical.png differ
diff --git a/Software/data/static/img/info.png b/Software/data/static/img/info.png
new file mode 100644
index 0000000..1fb0c51
Binary files /dev/null and b/Software/data/static/img/info.png differ
diff --git a/Software/data/static/img/warn.png b/Software/data/static/img/warn.png
new file mode 100644
index 0000000..1b0cd43
Binary files /dev/null and b/Software/data/static/img/warn.png differ
diff --git a/Software/src/can.cpp b/Software/src/can.cpp
index de0eb13..512e468 100644
--- a/Software/src/can.cpp
+++ b/Software/src/can.cpp
@@ -7,7 +7,7 @@ void Init_CAN()
 {
 
     if (CAN0.begin(MCP_STDEXT, CAN_500KBPS, MCP_16MHZ) != CAN_OK)
-        MaintainDTC(DTC_CAN_TRANSCEIVER_FAILED, true);
+        MaintainDTC(DTC_CAN_TRANSCEIVER_FAILED, DTC_CRITICAL, true);
 
     CAN0.init_Mask(0, 0, 0x07FF0000); // Init first mask...
     CAN0.init_Mask(1, 0, 0x07FF0000); // Init second mask...
@@ -39,7 +39,7 @@ uint32_t Process_CAN_WheelSpeed()
         return milimeters_to_add;
     }
 
-    MaintainDTC(DTC_NO_CAN_SIGNAL, (millis() > lastRecTimestamp + 10000 ? true : false));
+    MaintainDTC(DTC_NO_CAN_SIGNAL, DTC_CRITICAL, (millis() > lastRecTimestamp + 10000 ? true : false));
 
     return 0;
 }
diff --git a/Software/src/config.cpp b/Software/src/config.cpp
index a3dd961..fc56ba3 100644
--- a/Software/src/config.cpp
+++ b/Software/src/config.cpp
@@ -84,8 +84,7 @@ void GetConfig_EEPROM()
 
   if (Checksum_EEPROM((uint8_t *)&LubeConfig, sizeof(LubeConfig)) != checksum)
   {
-    MaintainDTC(DTC_EEPROM_CFG_BAD, true);
-    FormatConfig_EEPROM();
+    MaintainDTC(DTC_EEPROM_CFG_BAD, DTC_CRITICAL, true);
   }
   LubeConfig.checksum = checksum;
 }
@@ -118,7 +117,7 @@ void GetPersistence_EEPROM()
   {
     MovePersistencePage_EEPROM(true);
     FormatPersistence_EEPROM();
-    MaintainDTC(DTC_EEPROM_PDSADRESS_BAD, true);
+    MaintainDTC(DTC_EEPROM_PDSADRESS_BAD, DTC_CRITICAL, true);
   }
   else
   {
@@ -129,7 +128,7 @@ void GetPersistence_EEPROM()
 
     if (Checksum_EEPROM((uint8_t *)&PersistenceData, sizeof(PersistenceData)) != checksum)
     {
-      MaintainDTC(DTC_EEPROM_PDS_BAD, true);
+      MaintainDTC(DTC_EEPROM_PDS_BAD, DTC_CRITICAL, true);
     }
     PersistenceData.checksum = checksum;
   }
@@ -224,10 +223,10 @@ boolean checkEEPROMavailable()
 {
   if (!ee.isConnected())
   {
-    MaintainDTC(DTC_NO_EEPROM_FOUND, true);
+    MaintainDTC(DTC_NO_EEPROM_FOUND, DTC_CRITICAL, true);
     globals.systemStatus = sysStat_Error;
     return false;
   }
-  MaintainDTC(DTC_NO_EEPROM_FOUND, false);
+  MaintainDTC(DTC_NO_EEPROM_FOUND, DTC_CRITICAL, false);
   return true;
 }
\ No newline at end of file
diff --git a/Software/src/dtc.cpp b/Software/src/dtc.cpp
index 2b45fb6..0676036 100644
--- a/Software/src/dtc.cpp
+++ b/Software/src/dtc.cpp
@@ -2,7 +2,7 @@
 
 DTCEntry_s DTCStorage[MAX_DTC_STORAGE];
 
-void MaintainDTC(DTCNums_t DTC_no, boolean active)
+void MaintainDTC(DTCNums_t DTC_no, DTCSeverity_t DTC_severity, boolean active)
 {
     for (int i = 0; i < MAX_DTC_STORAGE; i++)
     {
@@ -13,6 +13,7 @@ void MaintainDTC(DTCNums_t DTC_no, boolean active)
                 Serial.printf("DTC gone active: %d\n", DTC_no);
                 DTCStorage[i].timestamp = millis();
                 DTCStorage[i].active = DTC_ACTIVE;
+                DTCStorage[i].severity = DTC_severity;
             }
             if (!active && DTCStorage[i].active == DTC_ACTIVE)
             {
@@ -81,5 +82,25 @@ DTCNums_t getlastDTC(boolean only_active)
         }
     }
 
+    return pointer >= 0 ? DTCStorage[pointer].Number : DTC_LAST_DTC;
+}
+
+DTCNums_t getlastDTC_Severity(boolean only_active, DTCSeverity_t severity)
+{
+    int8_t pointer = -1;
+    uint32_t lasttimestamp = 0;
+
+    for (int i = 0; i < MAX_DTC_STORAGE; i++)
+    {
+        if (DTCStorage[i].Number > 0 && DTCStorage[i].timestamp > lasttimestamp)
+        {
+            if ((only_active == false || DTCStorage[i].active == DTC_ACTIVE) && DTCStorage[i].severity == severity)
+            {
+                pointer = i;
+                lasttimestamp = DTCStorage[i].timestamp;
+            }
+        }
+    }
+
     return pointer >= 0 ? DTCStorage[pointer].Number : DTC_LAST_DTC;
 }
\ No newline at end of file
diff --git a/Software/src/dtc.h b/Software/src/dtc.h
index 320b833..a3de2a0 100644
--- a/Software/src/dtc.h
+++ b/Software/src/dtc.h
@@ -8,6 +8,7 @@
 typedef enum DTCNums_e
 {
   DTC_TANK_EMPTY = 1,
+  DTC_TANK_LOW,
   DTC_NO_EEPROM_FOUND,
   DTC_EEPROM_CFG_BAD,
   DTC_EEPROM_PDS_BAD,
@@ -31,17 +32,26 @@ typedef enum DTCActive_e
   DTC_PREVIOUS
 } DTCActive_t;
 
+typedef enum DTCSeverity_e
+{
+  DTC_INFO,
+  DTC_WARN,
+  DTC_CRITICAL
+} DTCSeverity_t;
+
 typedef struct DTCEntry_s
 {
   DTCNums_t Number;
   uint32_t timestamp;
   DTCActive_t active;
+  DTCSeverity_t severity;
 } DTCEntry_t;
 
-void MaintainDTC(DTCNums_t DTC_no, boolean active);
+void MaintainDTC(DTCNums_t DTC_no, DTCSeverity_t DTC_severity, boolean active);
 void ClearDTC(DTCNums_t DTC_no);
 void ClearAllDTC();
 DTCNums_t getlastDTC(boolean only_active);
+DTCNums_t getlastDTC_Severity(boolean only_active, DTCSeverity_t severity);
 
 extern DTCEntry_s DTCStorage[MAX_DTC_STORAGE];
 #endif
\ No newline at end of file
diff --git a/Software/src/globals.h b/Software/src/globals.h
index 711550f..a131760 100644
--- a/Software/src/globals.h
+++ b/Software/src/globals.h
@@ -33,6 +33,8 @@ typedef struct Globals_s
   char DeviceName[33];
   uint32_t FlashVersion;
   uint16_t eePersistanceAdress;
+  uint8_t TankPercentage;
+  bool hasDTC;
 } Globals_t;
 
 extern Globals_t globals;
diff --git a/Software/src/gps.cpp b/Software/src/gps.cpp
index 7356e8a..7c82c11 100644
--- a/Software/src/gps.cpp
+++ b/Software/src/gps.cpp
@@ -51,7 +51,7 @@ uint32_t Process_GPS_WheelSpeed()
         }
     }
 
-    MaintainDTC(DTC_NO_GPS_SERIAL, (millis() > lastRecTimestamp + 10000));
+    MaintainDTC(DTC_NO_GPS_SERIAL,DTC_CRITICAL, (millis() > lastRecTimestamp + 10000));
 
     return 0;
 }
diff --git a/Software/src/lubeapp.cpp b/Software/src/lubeapp.cpp
index d927962..3844559 100644
--- a/Software/src/lubeapp.cpp
+++ b/Software/src/lubeapp.cpp
@@ -5,23 +5,35 @@ uint32_t lubePulseTimestamp = 0;
 void RunLubeApp(uint32_t add_milimeters)
 {
 
-    MaintainDTC(DTC_TANK_EMPTY, (PersistenceData.tankRemain_µl < LubeConfig.amountPerDose_µl));
+    globals.TankPercentage = PersistenceData.tankRemain_µl / (LubeConfig.tankCapacity_ml * 1000);
+
+    MaintainDTC(DTC_TANK_EMPTY, DTC_CRITICAL, (PersistenceData.tankRemain_µl < LubeConfig.amountPerDose_µl));
+    MaintainDTC(DTC_TANK_LOW, DTC_WARN, (globals.TankPercentage < LubeConfig.TankRemindAtPercentage));
 
     static tSystem_Status preserverSysStatusError;
 
-    if (globals.systemStatus != sysStat_Error)
-        preserverSysStatusError = globals.systemStatus;
-
-    if (getlastDTC(true) < DTC_LAST_DTC)
+    if (getlastDTC(false) < DTC_LAST_DTC)
     {
-        globals.systemStatus = sysStat_Error;
+        globals.hasDTC = true;
+        if (getlastDTC_Severity(true, DTC_CRITICAL) < DTC_LAST_DTC)
+        {
+            if (globals.systemStatus != sysStat_Error)
+            {
+                preserverSysStatusError = globals.systemStatus;
+            }
+            globals.systemStatus = sysStat_Error;
+        }
+        else
+        {
+            if (globals.systemStatus == sysStat_Error)
+            {
+                globals.systemStatus = preserverSysStatusError;
+            }
+        }
     }
     else
     {
-        if (globals.systemStatus == sysStat_Error)
-        {
-            globals.systemStatus = preserverSysStatusError;
-        }
+        globals.hasDTC = false;
     }
 
     // Add traveled Distance in mm
diff --git a/Software/src/main.cpp b/Software/src/main.cpp
index 52123b1..7d86a15 100644
--- a/Software/src/main.cpp
+++ b/Software/src/main.cpp
@@ -506,14 +506,12 @@ void LED_Process(uint8_t override, CRGB SetColor)
     oldSysStatus = globals.systemStatus;
   }
 
-  uint32_t percentage = PersistenceData.tankRemain_µl / (LubeConfig.tankCapacity_ml * 1000);
-
   switch (LED_Status)
   {
   case LED_Startup:
     FastLED.setBrightness(255);
 
-    if (percentage < LubeConfig.TankRemindAtPercentage)
+    if (globals.TankPercentage < LubeConfig.TankRemindAtPercentage)
       leds[0] = CRGB::OrangeRed;
     else
       leds[0] = CRGB::White;
diff --git a/Software/src/webui.cpp b/Software/src/webui.cpp
index a2fe890..e18dcd3 100644
--- a/Software/src/webui.cpp
+++ b/Software/src/webui.cpp
@@ -16,7 +16,7 @@ void initWebUI()
   if (!LittleFS.begin())
   {
     Serial.println("An Error has occurred while mounting LittleFS");
-    MaintainDTC(DTC_FLASHFS_ERROR, true);
+    MaintainDTC(DTC_FLASHFS_ERROR, DTC_CRITICAL, true);
     return;
   }
 
@@ -117,7 +117,7 @@ String processor(const String &var)
     return "hidden";
 #endif
   if (var == "SHOW_DTC_TABLE")
-    return globals.systemStatus == sysStat_Error ? "" : "hidden";
+    return globals.hasDTC ? "" : "hidden";
 
   if (var == "DTC_TABLE")
   {
@@ -137,6 +137,20 @@ String processor(const String &var)
 
         temp = temp + "<tr><td>" + String(buff_timestamp);
         temp = temp + "</td><td>" + String(DTCStorage[i].Number) + "</td><td>";
+        temp = temp + "<img src=static/img/";
+        switch (DTCStorage[i].severity)
+        {
+        case DTC_CRITICAL:
+          temp = temp + "critical";
+          break;
+        case DTC_WARN:
+          temp = temp + "warn";
+          break;
+        case DTC_INFO:
+          temp = temp + "info";
+          break;
+        }
+        temp = temp + "_black.png></td><td>";
 
         if (DTCStorage[i].active == DTC_ACTIVE)
           temp = temp + "active";