diff --git a/src/views/dashboards/userDashboard/wash/MyWashStart.vue b/src/views/dashboards/userDashboard/wash/MyWashStart.vue
index d062d659..e1ae2d8d 100644
--- a/src/views/dashboards/userDashboard/wash/MyWashStart.vue
+++ b/src/views/dashboards/userDashboard/wash/MyWashStart.vue
@@ -48,6 +48,9 @@ const currentStep = ref(0);
 const hideDynamicImage = ref(false);
 const vehicleStepError = ref<string | null>(null);
 const washActionError = ref<string | null>(null);
+const questionStepError = ref<string | null>(null);
+const pendingQuestionSyncs = ref<number[]>([]);
+const failedQuestionSyncs = ref<number[]>([]);
 const isSelfServeRetrying = ref(false);
 const isCompletingWash = ref(false);
 const isVehicleStepNextLoading = ref(false);
@@ -296,6 +299,38 @@ const {
   isServiceAllowed,
 });
 
+const normalizeQuestionId = (questionId: any) => Number.parseInt(String(questionId ?? 0), 10);
+
+const visibleQuestionIds = computed(
+  () =>
+    new Set(
+      visibleQuestions.value
+        .map((question: any) => normalizeQuestionId(question?.id))
+        .filter((questionId: number) => Number.isInteger(questionId) && questionId > 0)
+    )
+);
+
+const hasVisiblePendingQuestionSync = computed(() =>
+  pendingQuestionSyncs.value.some((questionId) => visibleQuestionIds.value.has(questionId))
+);
+
+const hasVisibleFailedQuestionSync = computed(() =>
+  failedQuestionSyncs.value.some((questionId) => visibleQuestionIds.value.has(questionId))
+);
+
+const hasBlockingVisibleQuestionSync = computed(
+  () => hasVisiblePendingQuestionSync.value || hasVisibleFailedQuestionSync.value
+);
+
+const allVisibleQuestionsAnswered = computed(
+  () =>
+    !hasBlockingVisibleQuestionSync.value &&
+    (selfServeQuestionsAnswered.value ||
+      visibleQuestions.value.every(
+        (question) => answers.value[question.id] === true || answers.value[question.id] === false
+      ))
+);
+
 const { steps, clickableSteps, isNextButtonDisabled, handleConfirmNext, targetStepForStart } = useWashFlowState({
   currentStep,
   washInProgress,
@@ -306,13 +341,7 @@ const { steps, clickableSteps, isNextButtonDisabled, handleConfirmNext, targetSt
   radioLaneOption,
   radioWashType,
   nearestDepartment,
-  allVisibleQuestionsAnswered: computed(
-    () =>
-      selfServeQuestionsAnswered.value ||
-      visibleQuestions.value.every(
-        (question) => answers.value[question.id] === true || answers.value[question.id] === false
-      )
-  ),
+  allVisibleQuestionsAnswered,
   isLoadingSelfServeData,
   activeTasks: displayedActiveTasks,
   completedTasks,
@@ -444,14 +473,6 @@ watch(dynamicImageUrl, () => {
   hideDynamicImage.value = false;
 });
 
-const allVisibleQuestionsAnswered = computed(
-  () =>
-    selfServeQuestionsAnswered.value ||
-    visibleQuestions.value.every(
-      (question) => answers.value[question.id] === true || answers.value[question.id] === false
-    )
-);
-
 const hasAllowedVehicleTypeSelection = computed(() => {
   const selectedVehicleTypeId = vehicleTypeSelect.value;
   if (selectedVehicleTypeId === null || selectedVehicleTypeId === undefined) {
@@ -1145,26 +1166,84 @@ const onToggleTask = (taskId: number, value: boolean) => {
   };
 };
 
-const submitQuestionAnswer = async (questionId: number, value: boolean) => {
-  answerQuestion(questionId, value);
+const addQuestionSyncId = (target: typeof pendingQuestionSyncs, questionId: number) => {
+  if (!target.value.includes(questionId)) {
+    target.value = [...target.value, questionId];
+  }
+};
 
+const removeQuestionSyncId = (target: typeof pendingQuestionSyncs, questionId: number) => {
+  target.value = target.value.filter((candidateId) => candidateId !== questionId);
+};
+
+const buildQuestionSyncPayload = (questionId: number, value: boolean) => {
   const laneId = getEffectiveLaneId();
   if (!nearestDepartment.value || !laneId || !licensePlateInput.value?.trim()) {
+    return null;
+  }
+
+  return {
+    departmentId: nearestDepartment.value.id,
+    laneId,
+    customerNumber: getNumericCustomerNumber(),
+    reg: licensePlateInput.value,
+    questionId,
+    value,
+    vehicleTypeId: vehicleTypeSelect.value || null,
+  };
+};
+
+const syncQuestionAnswer = async (questionId: number, value: boolean) => {
+  const normalizedQuestionId = normalizeQuestionId(questionId);
+  if (!normalizedQuestionId) {
+    return false;
+  }
+
+  const payload = buildQuestionSyncPayload(normalizedQuestionId, value);
+  if (!payload) {
+    return true;
+  }
+
+  addQuestionSyncId(pendingQuestionSyncs, normalizedQuestionId);
+  removeQuestionSyncId(failedQuestionSyncs, normalizedQuestionId);
+
+  try {
+    await syncVehicleAnswer(payload);
+    removeQuestionSyncId(failedQuestionSyncs, normalizedQuestionId);
+    if (!hasVisibleFailedQuestionSync.value) {
+      questionStepError.value = null;
+    }
+    return true;
+  } catch (error) {
+    console.error("Error synchronizing self-serve answer:", error);
+    addQuestionSyncId(failedQuestionSyncs, normalizedQuestionId);
+    questionStepError.value = extractErrorMessage(error, "Kunne ikke gemme dit svar. Prøv igen, før du fortsætter.");
+    return false;
+  } finally {
+    removeQuestionSyncId(pendingQuestionSyncs, normalizedQuestionId);
+  }
+};
+
+const submitQuestionAnswer = async (questionId: number, value: boolean) => {
+  answerQuestion(questionId, value);
+  await syncQuestionAnswer(questionId, value);
+};
+
+const retryFailedQuestionSyncs = async () => {
+  const retryQuestionIds = failedQuestionSyncs.value.filter((questionId) => visibleQuestionIds.value.has(questionId));
+  if (retryQuestionIds.length === 0) {
+    questionStepError.value = null;
     return;
   }
 
-  try {
-    await syncVehicleAnswer({
-      departmentId: nearestDepartment.value.id,
-      laneId,
-      customerNumber: getNumericCustomerNumber(),
-      reg: licensePlateInput.value,
-      questionId,
-      value,
-      vehicleTypeId: vehicleTypeSelect.value || null,
-    });
-  } catch (error) {
-    console.error("Error synchronizing self-serve answer:", error);
+  for (const questionId of retryQuestionIds) {
+    const value = answers.value[questionId];
+    if (value !== true && value !== false) {
+      removeQuestionSyncId(failedQuestionSyncs, questionId);
+      continue;
+    }
+
+    await syncQuestionAnswer(questionId, value);
   }
 };
 
@@ -1172,7 +1251,14 @@ const toggleEditAnswers = () => {
   editAnswers.value = !editAnswers.value;
 };
 
+const isCurrentStepNextButtonDisabled = () =>
+  isNextButtonDisabled() || (currentStep.value === steps.QUESTIONS && hasBlockingVisibleQuestionSync.value);
+
 const onConfirmNext = async () => {
+  if (isCurrentStepNextButtonDisabled()) {
+    return;
+  }
+
   const wasQuestionsStep = currentStep.value === steps.QUESTIONS;
   const previousQuestionReviewKey = confirmedQuestionReviewKey.value;
 
@@ -1589,6 +1675,29 @@ watch(
                   currentStep === steps.COMPLETED
                 "
               >
+                <b-message
+                  v-if="questionStepError"
+                  type="is-danger"
+                  has-icon
+                  :closable="false"
+                  data-testid="self-serve-question-sync-error"
+                >
+                  <div class="is-flex is-align-items-center is-justify-content-space-between is-flex-wrap-wrap">
+                    <span class="mr-3">{{ questionStepError }}</span>
+                    <b-button
+                      size="is-small"
+                      type="is-danger is-light"
+                      icon-pack="fas"
+                      icon-left="sync-alt"
+                      data-testid="self-serve-question-sync-retry"
+                      :loading="hasVisiblePendingQuestionSync"
+                      @click="retryFailedQuestionSyncs"
+                    >
+                      {{ $t("common.try_again") }}
+                    </b-button>
+                  </div>
+                </b-message>
+
                 <SelfServeQuestionsStep
                   :is-loading="isLoadingSelfServeData"
                   :visible-questions="visibleQuestions"
@@ -1714,7 +1823,7 @@ watch(
                       icon-right="arrow-right"
                       data-testid="self-serve-nav-next"
                       :loading="isVehicleStepNextLoading"
-                      :disabled="isVehicleStepNextLoading || isNextButtonDisabled()"
+                      :disabled="isVehicleStepNextLoading || isCurrentStepNextButtonDisabled()"
                       @click.prevent="onVehicleStepNext"
                     >
                       {{ $t("common.next") }}
@@ -1744,7 +1853,7 @@ watch(
                       icon-right="arrow-right"
                       data-testid="self-serve-nav-confirm"
                       :loading="isStartingWash"
-                      :disabled="isStartingWash || isNextButtonDisabled()"
+                      :disabled="isStartingWash || isCurrentStepNextButtonDisabled()"
                       @click="onConfirmNext"
                     >
                       {{ $t(confirmActionLabelKey) }}
diff --git a/tests/unit/my-wash-start.spec.js b/tests/unit/my-wash-start.spec.js
index 6b334639..ba8c35e7 100644
--- a/tests/unit/my-wash-start.spec.js
+++ b/tests/unit/my-wash-start.spec.js
@@ -390,6 +390,9 @@ describe("MyWashStart", () => {
     mocks.addVehicle.mockClear();
     mocks.sessionRequest.mockClear();
     mocks.sessionRequest.mockResolvedValue(undefined);
+    mocks.handleConfirmNext.mockClear();
+    mocks.isNextButtonDisabled.mockClear();
+    mocks.isNextButtonDisabled.mockReturnValue(false);
     mocks.onStartWash.mockClear();
     mocks.onStopWash.mockReset();
     mocks.onStopWash.mockResolvedValue(true);
@@ -540,6 +543,51 @@ describe("MyWashStart", () => {
     await flushPromises();
   });
 
+  it("surfaces failed question answer syncs and blocks question confirmation until retry succeeds", async () => {
+    mocks.syncVehicleAnswer.mockRejectedValueOnce(new Error("Question sync failed")).mockResolvedValueOnce(undefined);
+
+    const wrapper = mountWithApp(MyWashStart, {
+      global: {
+        stubs: stubComponents,
+      },
+    });
+
+    await flushPromises();
+    await wrapper.get('[data-testid="emit-lane"]').trigger("click");
+    await wrapper.get('[data-testid="emit-registration"]').trigger("click");
+    await wrapper.get('[data-testid="emit-vehicle-type"]').trigger("click");
+    await nextTick();
+    await wrapper.get('[data-testid="self-serve-nav-next"]').trigger("click");
+    await flushPromises();
+
+    await wrapper.get('[data-testid="emit-answer"]').trigger("click");
+    await flushPromises();
+
+    expect(wrapper.get('[data-testid="self-serve-question-sync-error"]').text()).toContain("Question sync failed");
+
+    const confirmButton = wrapper.get('[data-testid="self-serve-nav-confirm"]');
+    expect(confirmButton.attributes("disabled")).toBeDefined();
+
+    await confirmButton.trigger("click");
+    expect(mocks.handleConfirmNext).not.toHaveBeenCalled();
+
+    await wrapper.get('[data-testid="self-serve-question-sync-retry"]').trigger("click");
+    await flushPromises();
+
+    expect(mocks.syncVehicleAnswer).toHaveBeenCalledTimes(2);
+    expect(mocks.syncVehicleAnswer).toHaveBeenNthCalledWith(2, {
+      departmentId: 6,
+      laneId: 7,
+      customerNumber: 12345679,
+      reg: "AB12345",
+      questionId: 11,
+      value: true,
+      vehicleTypeId: 2,
+    });
+    expect(wrapper.find('[data-testid="self-serve-question-sync-error"]').exists()).toBe(false);
+    expect(wrapper.get('[data-testid="self-serve-nav-confirm"]').attributes("disabled")).toBeUndefined();
+  });
+
   it("shows disabled warning without showing loading state when department self-serve is unavailable", async () => {
     mocks.nearestDepartment.value = {
       ...mocks.nearestDepartment.value,