There are 2 Oxygen sensors. One is on top of the catalytic converter called the upstream and the other is at the bottom of the catalytic converter called the downstream.
before and after the catylitic converter.
There are 2 oxygen sensors. One before the catalyltic converter and one after the catalyltic converter.
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I believe there are 2 oxygen sensors that are used for air / fuel ratio and 2 oxygen sensors that are downstream from the catalytic converters and are called catalyst monitors
On my 1998 Ford Expedition XLT , There are 4 Oxygen sensors. 1 each in front of the Cats. and 1 each behing the cat. for a total of 4 Oxygen Sensors.
On a 1998 Ford Explorer Sport : If it has the 4.0 litre EFI engine ( which is an over head valve / pushrod design engine / the 8th character of the VIN is an " X " ) there are ( 3 oxygen sensors ) If it has the 4.0 litre SOHC engine ( the 8th character of the VIN is an " E " ) there are ( 4 oxygen sensors )
5 w 30 - according to the 1998 Ford Escort owners manual
There are 4 oxygen sensors on the 2001 ford f150 v6.