diff --git a/TIAM.Database/DataLayers/Admins/AdminDal.cs b/TIAM.Database/DataLayers/Admins/AdminDal.cs
index a585f3b7..b2a82f72 100644
--- a/TIAM.Database/DataLayers/Admins/AdminDal.cs
+++ b/TIAM.Database/DataLayers/Admins/AdminDal.cs
@@ -48,7 +48,7 @@ namespace TIAM.Database.DataLayers.Admins
         public List<Car> GetCarByUserProductMappingId(Guid userProductMappingId) => Session(ctx => ctx.Cars.Where(x => x.UserProductMappingId == userProductMappingId).ToList());
         public Task<List<Car>> GetCarsByUserProductMappingIdAsync(Guid userProductMappingId) => SessionAsync(ctx => ctx.Cars.Where(x => x.UserProductMappingId == userProductMappingId).ToList());
         public Task<bool> AddCarAsync(Car car) => TransactionAsync(ctx => ctx.Cars.Add(car).State == EntityState.Added);
-        public Task<bool> UpdateCarAsync(Car car) => TransactionAsync(ctx => ctx.Cars.Update(car).State == EntityState.Modified);
+        public Task<Car?> UpdateCarAsync(Car car) => UpdateSafeAsync(car);
         public Task<bool> RemoveCarAsync(Car car) => TransactionAsync(ctx => ctx.Cars.Remove(car).State == EntityState.Deleted);
 
         #endregion Car
diff --git a/TIAM.Services.Server.Tests/LoginServices/LoginServiceServerTests.cs b/TIAM.Services.Server.Tests/LoginServices/LoginServiceServerTests.cs
index d21768be..a2c25886 100644
--- a/TIAM.Services.Server.Tests/LoginServices/LoginServiceServerTests.cs
+++ b/TIAM.Services.Server.Tests/LoginServices/LoginServiceServerTests.cs
@@ -1,3 +1,4 @@
+using AyCode.Core.Consts;
 using AyCode.Core.Server.Loggers;
 using AyCode.Services.Server.Tests.LoginServices;
 using TIAM.Database.DataLayers.Users;
@@ -7,6 +8,7 @@ using TIAM.Entities.Emails;
 using TIAM.Entities.Profiles;
 using TIAM.Entities.ServiceProviders;
 using TIAM.Entities.Users;
+using TIAM.Models.Dtos.Users;
 using TIAM.Models.Server.Logins;
 using TIAM.Services.Server.Logins;
 
@@ -24,11 +26,24 @@ namespace TIAM.Services.Server.Tests.LoginServices
 
         [DataTestMethod]
         [DataRow([RegisterUserIdString, RegisterEmail, RegisterPassword])]
-        public override Task AcBase_RegisterUser_ReturnsUser_WhenUserExist(string[] userIdEmailPasswordStrings)
+        public override async Task AcBase_RegisterUser_ReturnsUser_WhenUserExist(string[] userIdEmailPasswordStrings)
         {
             GlobalLogger.Debug("Test started0...");
 
-            return base.AcBase_RegisterUser_ReturnsUser_WhenUserExist(userIdEmailPasswordStrings);
+            //var loginService = Activator.CreateInstance(typeof(LoginService), Dal, AcEnv.AppConfiguration) as LoginService;
+
+            //var userId = Guid.Parse(RegisterUserIdString);
+            //var errorCode = await loginService.RegistrationAsync(userId, RegisterEmail, RegisterPassword, null);
+            //var userModelDto = await Dal.GetUserModelDtoByIdAsync<UserModelDtoDetail>(userId, false);
+
+            //if (userModelDto != null)
+            //{
+            //    var userProperties = new Dictionary<Guid, string>();
+            //    //get user's properties
+            //    var hasProperties = userModelDto.ServiceProviders.Count > 0 ? true : (userModelDto.ServiceProviders.Count == 0 ? false : false);
+            //}
+
+            await base.AcBase_RegisterUser_ReturnsUser_WhenUserExist(userIdEmailPasswordStrings);
         }
 
         [DataTestMethod]
diff --git a/TIAMWebApp/Server/Controllers/ServiceProviderAPIController.cs b/TIAMWebApp/Server/Controllers/ServiceProviderAPIController.cs
index 3c73a0d4..85816410 100644
--- a/TIAMWebApp/Server/Controllers/ServiceProviderAPIController.cs
+++ b/TIAMWebApp/Server/Controllers/ServiceProviderAPIController.cs
@@ -316,14 +316,14 @@ namespace TIAMWebApp.Server.Controllers
 
         [NonAction]
         [ApiExplorerSettings(IgnoreApi = true)]
-        private async Task<bool> CarDataChanging(Car car, TrackingState trackingState)
+        private async Task<Car?> CarDataChanging(Car car, TrackingState trackingState)
         {
             var logText = $"[{trackingState.ToString().ToUpper()}] CarDataChanging called; Id: {car.Id}; OwnerId: {car.UserProductMappingId}; LicensePlate: {car.LicencePlate}";
 
             if (car.UserProductMappingId.IsNullOrEmpty() || car.LicencePlate.IsNullOrWhiteSpace())
             {
                 _logger.Error(logText);
-                return false;
+                return null;
             }
 
             _logger.Info(logText);
@@ -333,11 +333,11 @@ namespace TIAMWebApp.Server.Controllers
                 case TrackingState.Add:
                     if (car.Id.IsNullOrEmpty()) car.Id = Guid.NewGuid();
 
-                    return await adminDal.AddCarAsync(car);
+                    return await adminDal.AddCarAsync(car) ? car : null;
                 case TrackingState.Update:
                     return await adminDal.UpdateCarAsync(car);
                 case TrackingState.Remove:
-                    return await adminDal.RemoveCarAsync(car);
+                    return await adminDal.RemoveCarAsync(car) ? car : null;
 
                 case TrackingState.Get:
                 case TrackingState.GetAll:
@@ -352,11 +352,7 @@ namespace TIAMWebApp.Server.Controllers
         [Tags("Finished", "Cars")]
         [EndpointSummary("Create car")]
         [SignalR(SignalRTags.CreateCar)]
-        public async Task<Car?> CreateCar(Car car)
-        {
-            var result = await CarDataChanging(car, TrackingState.Add);
-            return result ? car : null;
-        }
+        public async Task<Car?> CreateCar(Car car) => await CarDataChanging(car, TrackingState.Add);
 
         [AllowAnonymous]
         [HttpPost]
@@ -364,12 +360,7 @@ namespace TIAMWebApp.Server.Controllers
         [Tags("Finished", "Cars")]
         [EndpointSummary("Update car")]
         [SignalR(SignalRTags.UpdateCar)]
-        public async Task<Car?> UpdateCar(Car car)
-        {
-            var result = await CarDataChanging(car, TrackingState.Update);
-            return result ? car : null;
-        }
-            
+        public async Task<Car?> UpdateCar(Car car) => await CarDataChanging(car, TrackingState.Update);
 
         [AllowAnonymous]
         [HttpPost]
@@ -377,8 +368,7 @@ namespace TIAMWebApp.Server.Controllers
         [Tags("Finished", "Cars")]
         [EndpointSummary("Delete car")]
         [SignalR(SignalRTags.DeleteCar)]
-        public async Task<IActionResult> DeleteCar(Car car)
-            => await CarDataChanging(car, TrackingState.Remove) ? Ok(car) : BadRequest("Invalid request");
+        public async Task<Car?> DeleteCar(Car car) => await CarDataChanging(car, TrackingState.Remove);
 
         [HttpPost]
         [Route(APIUrls.AddProductRouteName)]