........and when i open the front windows slightly there is a very strong smell of petrol i haved checked everything and find the cause???

I like the smell of petrol

Hi

Is it using more fuel than usual? If so then you very highly likely have a fuel leak.

If you're feeling brave you could check under the bonnet with the engine idling. You need to check all the fuel lines very closely, paying particular attention to their unions.

Very best regards

Geordie

You should probably get it checked out at a lexus dealership, you never know it may be serious and its better to be safe then sorrry!

You may have a leaking fuel pressure regulator or a busted fuel line. Get this remedied ASAP.