Mystery plug

Hi,

This vehicle is an OBD1 engine and this appears to be the diagnostic terminal connector. Looks like someone has left the jumper in place.

The way this works is when you want to check engine codes, you jump terminal TE1 and E1 on that connector which appears to what is done with that wire, then you turn the key to the on position and engine off and if there are codes, the engine light will start to flash. Let's say it has code 25, it will flash twice then pause, then flash 5 times. After all codes have reported, it will pause 5 seconds and then start flashing the same codes again.

Let me know if you have questions but you are ok to remove that jumper until you have codes.

Hello and welcome to 2CarPros. I had a diagnostic specialist at Lexus look at the pic and he believes the connector is for the EGR temperature sensor. The California emissions certified vehicles have an EGR with the temp sensor which that connector appears to plug in. The federal certified vehicle just had a short pin plugged to it so it appears like your vehicle is a federal certified vehicle and a short pin connector should be there in place. Hope the info shed some light to this mystery plug.