using System;

using Newtonsoft.Json.Linq;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string json = @"{

    ""car"": {

        ""type"": [{

            ""sedan"": {

                ""make"": ""honda"",

                ""model"": ""civics""

            }

        },

        {

            ""coupe"": {

                ""make"": ""ford"",

                ""model"": ""escort""

            }

        }]

    }

}"; 

        JObject jo = JObject.Parse(json);

        var token = jo.Descendants()

                    .OfType<JProperty>()

                    .Where(p => p.Value.ToString() == "honda")

                    .First();

        Console.WriteLine(token.Path);

    }

}

​