Answer to: Why is my oil light on .?Additional information. It's fairly common for this to be a simple oil pressure sensor / sending unit issue on Honda's. If engine oil pressure is an issue the engine will typically run very rough, but caution should be used to prevent an engine failure. Then sensor is typically located on mount where the oil filter is screwed on. This can be a bit tricky to access, but can be done with patience and typically wrenches vs using sockets. Remove the airfilter and airbox if they are obstructing the access to the sensor. There will be a rubber boot protecting the single wire. It will likely distengrate during removal, but pry carefully to try to salvage it. Remove the old sensor and connect a pressure test kit. Run the engine and let it warm up. Typically on older models the cooling fan should come on a couple of times. At idle you should have at least 14psi At 3000 RPM it should be 54- 60 psi. Check it a few times to confirm.