diff --git a/modules/sachsen/backend.py b/modules/sachsen/backend.py
index 97b02573..b3e7a924 100644
--- a/modules/sachsen/backend.py
+++ b/modules/sachsen/backend.py
@@ -20,6 +20,7 @@
 from .browser import SachsenBrowser
 from weboob.capabilities.gauge import ICapGauge, GaugeSensor, Gauge,\
         SensorNotFound
+from weboob.capabilities.base import find_id_list
 from weboob.tools.backend import BaseBackend
 
 
@@ -37,8 +38,7 @@ class SachsenLevelBackend(BaseBackend, ICapGauge):
 
     def iter_gauges(self, pattern=None):
         if pattern is None:
-            for gauge in self.browser.get_rivers_list():
-                yield gauge
+            return self.browser.get_rivers_list()
         else:
             lowpattern = pattern.lower()
             for gauge in self.browser.get_rivers_list():
@@ -46,24 +46,16 @@ class SachsenLevelBackend(BaseBackend, ICapGauge):
                         or lowpattern in gauge.object.lower():
                     yield gauge
 
-    def _get_gauge_by_id(self, id):
-        for gauge in self.browser.get_rivers_list():
-            if id == gauge.id:
-                return gauge
-        return None
-
     def _get_sensor_by_id(self, id):
         for gauge in self.browser.get_rivers_list():
             for sensor in gauge.sensors:
                 if id == sensor.id:
                     return sensor
-        return None
+        raise SensorNotFound()
 
     def iter_sensors(self, gauge, pattern=None):
         if not isinstance(gauge, Gauge):
-            gauge = self._get_gauge_by_id(gauge)
-            if gauge is None:
-                raise SensorNotFound()
+            gauge = find_id_list(self.browser.get_rivers_list(), _id, error=SensorNotFound)
         if pattern is None:
             for sensor in gauge.sensors:
                 yield sensor
@@ -76,13 +68,9 @@ class SachsenLevelBackend(BaseBackend, ICapGauge):
     def iter_gauge_history(self, sensor):
         if not isinstance(sensor, GaugeSensor):
             sensor = self._get_sensor_by_id(sensor)
-        if sensor is None:
-            raise SensorNotFound()
         return self.browser.iter_history(sensor)
 
     def get_last_measure(self, sensor):
         if not isinstance(sensor, GaugeSensor):
             sensor = self._get_sensor_by_id(sensor)
-        if sensor is None:
-            raise SensorNotFound()
         return sensor.lastvalue