docsayler

My engine light came on and the diagnostic narrowed it down to the F85Z9G444F sensor. Does anyone know where that is or how hard that particular one is to change? Thanks.

ji603

There are four sensors, two upstream and two downstream. Pretty sure that part number is for the downstream sensor (after the cat) but you have two banks... Bank 1 is thpass side of the engine, cylinder 1-4, and bank 2 is the other side of the engine.

Upstream sensors are on the exhaust pipe connected to the manifold before the cat, and the downstreams are after the cat converter.