DOES ANYONE KNOW THE OXYGEN SENSOR RELAY LOCATION FOR A 1989 240? thanks

 

Never heard of an oxygen sensor relay. The sensor itself is screwed into the catalytic converter on an '89. The wire from it runs up to the engine compartment to a connector just below the windshield wiper motor. That wire that it connects to runs directly to the ECU.

 

I understand. Thank you so much.