diff --git a/services/nginx/app/modules/selfserve/traits/selfserve_lane_command_t.php b/services/nginx/app/modules/selfserve/traits/selfserve_lane_command_t.php
index 5f8b9edc..41a2b52d 100644
--- a/services/nginx/app/modules/selfserve/traits/selfserve_lane_command_t.php
+++ b/services/nginx/app/modules/selfserve/traits/selfserve_lane_command_t.php
@@ -217,7 +217,19 @@ trait selfserve_lane_command_t
         }
 
         try {
-            return (new selfserve_wash_flow())->isMachineAllowedToStartWash((int)$this->id);
+            $reg = method_exists($this, 'getLicensePlate') ? trim((string)$this->getLicensePlate()) : '';
+            if ($reg === '') {
+                return false;
+            }
+
+            $customerNumber = method_exists($this, 'getCustomerNumber') ? (int)$this->getCustomerNumber() : null;
+            $snapshot = (new selfserve_wash_flow())->previewVehicleEligibility(
+                (int)$this->id,
+                $reg,
+                $customerNumber !== null && $customerNumber > 0 ? $customerNumber : null
+            );
+
+            return (bool)($snapshot['allowed'] ?? false);
         } catch (\Throwable) {
             return false;
         }
@@ -324,6 +336,7 @@ trait selfserve_lane_command_t
     protected function runRelaySideEffectsForWashStart(selfserve_lane_command_arguments $arguments): void
     {
         if ($arguments->defer_relay_side_effects) {
+            $this->setProgramPickerRelayStatusForWashStart();
             return;
         }
 
diff --git a/services/nginx/app/tests/Unit/Selfserve/SelfserveLaneStartEntranceTimeoutTest.php b/services/nginx/app/tests/Unit/Selfserve/SelfserveLaneStartEntranceTimeoutTest.php
index 10ef5cab..6826e18a 100644
--- a/services/nginx/app/tests/Unit/Selfserve/SelfserveLaneStartEntranceTimeoutTest.php
+++ b/services/nginx/app/tests/Unit/Selfserve/SelfserveLaneStartEntranceTimeoutTest.php
@@ -109,15 +109,17 @@ it('parses deferred relay side effects on start command arguments', function ():
     expect($arguments->defer_relay_side_effects)->toBeTrue();
 });
 
-it('skips cleaner, program picker and machine relay side effects when start asks to defer them', function (): void {
+it('syncs only the program picker relay when start asks to defer machine side effects', function (): void {
     $lane = new SelfserveLaneStartEntranceTimeoutHarness();
 
     $lane->runStartRelaySideEffects(true);
 
     expect($lane->cleanerRelayCalls)->toBe(0);
-    expect($lane->programPickerRelayCalls)->toBe(0);
+    expect($lane->programPickerRelayCalls)->toBe(1);
     expect($lane->machineRelayCalls)->toBe(0);
-    expect($lane->relayEvents)->toBe([]);
+    expect($lane->relayEvents)->toBe([
+        'program_picker:sync',
+    ]);
 });
 
 it('keeps cleaner, program picker and machine relay side effects in order for normal start commands', function (): void {