There is another problem. see related questions.
Year, engine?? Normaly lambda sensor is below exhaust collector
The Lambda Sensor is situated in exhaust downpipe with connector rear of engine N/S.
The lambda sensor telle the Engine Control Unit how well the fuel is being combusted, so that the ECU can set the engine to run smoothly, cleanly and reliably.
Can you show me a diagram of the upstream oxygen sensor on a 3.5l liter Oldsmobile Intrigue engine?
They should be in the exhaust system close to the engine ( either in the exhaust manifold outlets or the exhaust pipe ) before the exhaust enters the catalytic converters Bank 1 is the passenger side of the engine and sensor 1 is the upstream sensor Bank 2 is the driver side of the engine and sensor 1 is the upstream sensor on that side
when engine running , i took out msf sensor accidentally. Then lambda on ,
it refers to the location of the oxygen (o2) sensors relative to the engine. The upstream sensor is the one closest to the engine. The downstream sensor is furthest from the engine. Think of it as the way a stream of water, or in this case, a stream of exhaust flows.... From the engine To the tailpipe.
Lambda is o2 sensor in exhaust pipe.
at the back of the engine, screwed into the exhaust manifold
No Bank 1 is the passenger side of the engine in your Ford Expedition , Bank 2 is the drivers side Sensor 1 for both sides of the engine are before the catalytic converters ( upstream ) Sensor 2 for both sides of the engine are after the catalytic converters ( downstream )
The lambda sensor reads the oxygen in the exhaust stream.
the lambda sensor regulates the air and fuel mixture going into the engine. if the sensor is not accurate then the outcome is a loss in engine performance and worse gas mileage (less economical).