Diagram: Ford Explorer and V8 O2 (Oxygen) Sensor Locations
Above is a diagram showing Ford Explorer O2 Sensor locations. If your engine is throwing a code like PO153 "Upstream heated O2 sensor circuit slow response Bank 2" you'll need to find your oxygen sensor locations to replace the bad unit. The diagram also shows which side of the engine holds Bank 2 and Bank 1. Bank 1 is the side of the engine with Cylinder 1. It displays the Ford V8 numbering system for O2 sensors.