diff --git a/vehicle-data-platform/apps/api/internal/platform/handler_test.go b/vehicle-data-platform/apps/api/internal/platform/handler_test.go
index 16ca9ee6..b3dedf88 100644
--- a/vehicle-data-platform/apps/api/internal/platform/handler_test.go
+++ b/vehicle-data-platform/apps/api/internal/platform/handler_test.go
@@ -185,6 +185,9 @@ func TestHandlerVehicleCoverageSummary(t *testing.T) {
 	if body.Data.OnlineVehicles != 1 || body.Data.UnboundVehicles != 0 {
 		t.Fatalf("coverage summary should expose filtered online and binding totals, got %+v", body.Data)
 	}
+	if len(body.Data.MissingSources) == 0 {
+		t.Fatalf("coverage summary should expose missing source counts, got %+v", body.Data)
+	}
 }
 
 func TestSplitCSVEmptyReturnsEmptySlice(t *testing.T) {
diff --git a/vehicle-data-platform/apps/api/internal/platform/mock_store.go b/vehicle-data-platform/apps/api/internal/platform/mock_store.go
index 782a21a0..b6902c20 100644
--- a/vehicle-data-platform/apps/api/internal/platform/mock_store.go
+++ b/vehicle-data-platform/apps/api/internal/platform/mock_store.go
@@ -168,6 +168,15 @@ func (m *MockStore) VehicleCoverageSummary(ctx context.Context, query url.Values
 			summary.UnboundVehicles++
 		}
 	}
+	for _, protocol := range canonicalVehicleProtocols {
+		missing := 0
+		for _, row := range coverage.Items {
+			if !containsString(row.Protocols, protocol) {
+				missing++
+			}
+		}
+		summary.MissingSources = append(summary.MissingSources, MissingSourceStat{Protocol: protocol, Count: missing})
+	}
 	return summary, nil
 }
 
diff --git a/vehicle-data-platform/apps/api/internal/platform/model.go b/vehicle-data-platform/apps/api/internal/platform/model.go
index a009f8fe..fd2733b1 100644
--- a/vehicle-data-platform/apps/api/internal/platform/model.go
+++ b/vehicle-data-platform/apps/api/internal/platform/model.go
@@ -65,12 +65,13 @@ type VehicleCoverageRow struct {
 }
 
 type VehicleCoverageSummary struct {
-	TotalVehicles        int `json:"totalVehicles"`
-	OnlineVehicles       int `json:"onlineVehicles"`
-	SingleSourceVehicles int `json:"singleSourceVehicles"`
-	MultiSourceVehicles  int `json:"multiSourceVehicles"`
-	NoDataVehicles       int `json:"noDataVehicles"`
-	UnboundVehicles      int `json:"unboundVehicles"`
+	TotalVehicles        int                 `json:"totalVehicles"`
+	OnlineVehicles       int                 `json:"onlineVehicles"`
+	SingleSourceVehicles int                 `json:"singleSourceVehicles"`
+	MultiSourceVehicles  int                 `json:"multiSourceVehicles"`
+	NoDataVehicles       int                 `json:"noDataVehicles"`
+	UnboundVehicles      int                 `json:"unboundVehicles"`
+	MissingSources       []MissingSourceStat `json:"missingSources"`
 }
 
 type VehicleIdentityResolution struct {
diff --git a/vehicle-data-platform/apps/api/internal/platform/production_store.go b/vehicle-data-platform/apps/api/internal/platform/production_store.go
index 8a024fcd..67c5c097 100644
--- a/vehicle-data-platform/apps/api/internal/platform/production_store.go
+++ b/vehicle-data-platform/apps/api/internal/platform/production_store.go
@@ -297,9 +297,30 @@ func (s *ProductionStore) VehicleCoverageSummary(ctx context.Context, query url.
 	); err != nil {
 		return VehicleCoverageSummary{}, err
 	}
+	missingSources, err := s.coverageMissingSourceStats(ctx, query)
+	if err != nil {
+		return VehicleCoverageSummary{}, err
+	}
+	summary.MissingSources = missingSources
 	return summary, nil
 }
 
+func (s *ProductionStore) coverageMissingSourceStats(ctx context.Context, query url.Values) ([]MissingSourceStat, error) {
+	out := make([]MissingSourceStat, 0, len(canonicalVehicleProtocols))
+	for _, protocol := range canonicalVehicleProtocols {
+		next := copyValues(query)
+		next.Set("missingProtocol", protocol)
+		next.Set("limit", "1")
+		next.Set("offset", "0")
+		page, err := s.VehicleCoverage(ctx, next)
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, MissingSourceStat{Protocol: protocol, Count: page.Total})
+	}
+	return out, nil
+}
+
 func (s *ProductionStore) VehicleRealtime(ctx context.Context, query url.Values) (Page[VehicleRealtimeRow], error) {
 	built := buildVehicleRealtimeSQL(query)
 	total := 0
diff --git a/vehicle-data-platform/apps/web/src/api/types.ts b/vehicle-data-platform/apps/web/src/api/types.ts
index 9fd7580e..17cf645d 100644
--- a/vehicle-data-platform/apps/web/src/api/types.ts
+++ b/vehicle-data-platform/apps/web/src/api/types.ts
@@ -68,6 +68,7 @@ export interface VehicleCoverageSummary {
   multiSourceVehicles: number;
   noDataVehicles: number;
   unboundVehicles: number;
+  missingSources: MissingSourceStat[];
 }
 
 export interface VehicleIdentityResolution {
diff --git a/vehicle-data-platform/apps/web/src/pages/Vehicles.tsx b/vehicle-data-platform/apps/web/src/pages/Vehicles.tsx
index a47b1543..b2d65883 100644
--- a/vehicle-data-platform/apps/web/src/pages/Vehicles.tsx
+++ b/vehicle-data-platform/apps/web/src/pages/Vehicles.tsx
@@ -65,6 +65,14 @@ export function Vehicles({
       { label: '暂无来源车辆', value: (summary?.noDataVehicles ?? 0).toLocaleString(), filters: { serviceStatus: 'no_data' } },
       { label: '待绑定', value: (summary?.unboundVehicles ?? 0).toLocaleString(), filters: { bindingStatus: 'unbound' } }
     ];
+    for (const source of summary?.missingSources ?? []) {
+      if (source.count <= 0) continue;
+      items.push({
+        label: `缺 ${source.protocol}`,
+        value: source.count.toLocaleString(),
+        filters: { missingProtocol: source.protocol }
+      });
+    }
     return items;
   }, [pagination.total, summary]);
 
diff --git a/vehicle-data-platform/apps/web/src/test/App.test.tsx b/vehicle-data-platform/apps/web/src/test/App.test.tsx
index 619ad9b7..7421d00c 100644
--- a/vehicle-data-platform/apps/web/src/test/App.test.tsx
+++ b/vehicle-data-platform/apps/web/src/test/App.test.tsx
@@ -427,7 +427,8 @@ test('filters vehicle list by missing source evidence', async () => {
             singleSourceVehicles: 0,
             multiSourceVehicles: 1,
             noDataVehicles: 0,
-            unboundVehicles: 0
+            unboundVehicles: 0,
+            missingSources: [{ protocol: 'YUTONG_MQTT', count: 1 }]
           },
           traceId: 'trace-test',
           timestamp: 1783094400000
@@ -477,6 +478,8 @@ test('filters vehicle list by missing source evidence', async () => {
     expect(screen.getAllByText('缺失来源').length).toBeGreaterThanOrEqual(2);
   });
   expect(screen.getAllByText('缺 YUTONG_MQTT').length).toBeGreaterThanOrEqual(1);
+  fireEvent.click(screen.getByRole('button', { name: '缺 YUTONG_MQTT 1' }));
+  expect(window.location.hash).toBe('#/vehicles?missingProtocol=YUTONG_MQTT');
   fireEvent.click(screen.getByRole('button', { name: '缺 YUTONG_MQTT' }));
   expect(window.location.hash).toBe('#/vehicles?missingProtocol=YUTONG_MQTT');
   await waitFor(() => {