Where is the oil sensor for the thermostat

Hi, It sounds like what you are speaking of are components of the exhaust system, perhaps the manifold. Smoking from that area probably occurs from an unknown fluid leak onto the hot surface. Troubleshooting is needed to find out what is leaking on the hot parts and what will be needed to repair the leak. You can reach out to a shop near you for assistance -- https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.