Four Oxygen Sensors?!

Daves 95GT · 09-18-2001, 12:40 AM

you have a 95 gt. you only have 2 HEGO sensors. the guy at the parts store is a nut. no mustang EVER came with 4. the two sensors on the front of the converters on 1996 and later cars are oxygen sensors. the two behind the converters on 1996 and later cars are called CMS sensors(catalyst monitoring sensors). this is one of the differences between OBD1 and OBD11 thier job is to read the gases after ther cat. converter to determine the leven in which the converters are functioning. if a converters isnt performing properly, it will set a check engine light, and this is most of the time a hard fault. but no, your 1995 mustang gt is not equipped with 4 oxygen sensors. by the way, why are you replacing them? did you have an intermittent check engine light? if not, then there is not any reason to replace them. it is a common misconception that they need periodic replacement, and they do not. as long as they are switching and giving correct readings, they are fine. if they are contaminated , they will trun the check engine light on once the car has warmed up. a lot of fuel additives will contaminate them, but you will see a light if it does.

[This message has been edited by Daves 95GT (edited 09-18-2001).]

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09-18-2001, 12:40 AM	#6
Daves 95GT Registered Member Join Date: Sep 2001 Location: frisco tx, usa Posts: 11	you have a 95 gt. you only have 2 HEGO sensors. the guy at the parts store is a nut. no mustang EVER came with 4. the two sensors on the front of the converters on 1996 and later cars are oxygen sensors. the two behind the converters on 1996 and later cars are called CMS sensors(catalyst monitoring sensors). this is one of the differences between OBD1 and OBD11 thier job is to read the gases after ther cat. converter to determine the leven in which the converters are functioning. if a converters isnt performing properly, it will set a check engine light, and this is most of the time a hard fault. but no, your 1995 mustang gt is not equipped with 4 oxygen sensors. by the way, why are you replacing them? did you have an intermittent check engine light? if not, then there is not any reason to replace them. it is a common misconception that they need periodic replacement, and they do not. as long as they are switching and giving correct readings, they are fine. if they are contaminated , they will trun the check engine light on once the car has warmed up. a lot of fuel additives will contaminate them, but you will see a light if it does. [This message has been edited by Daves 95GT (edited 09-18-2001).]