Thread On O2 Sensor

[lexus boy]

the o2 sensor after the CAt

had a quick look, looks like a 18mm fine thread is thsi right?

anyone know?

[Tony-Bones]

the o2 sensor after the CAt

had a quick look, looks like a 18mm fine thread is thsi right?

anyone know?

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I have never seen a fine thread? i'm sure the thread is course. does'nt the exhaust have a "blank" bolt fitted in the would be o2 port.

[lexus boy]

definitely not a coarse thread,

no aftermarket exhaust no port there yet, have to make one

[Tony-Bones]

definitely not a coarse thread,

no aftermarket exhaust no port there yet, have to make one

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sorry i think i must have missed some of this topic "make one" why?

[lexus boy]

sorry i was in rush so only wrote half a story

I need to create a matching stainless boss for the Post cat sensor

as new exhaust doesnt have a port yet.

hence why i need to know the thread of the sensor.

[Tony-Bones]

sorry i was in rush so only wrote half a story

I need to create a matching stainless boss for the Post cat sensor

as new exhaust doesnt have a port yet.

hence why i need to know the thread of the sensor.

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Ok, best advice is get the sensor then type match the thread on a gauge or a selection of nuts, drill exhaust/ weld job done. is'nt it? Question "Why" does any car have a "post" o2 sensor?

[lexus boy]

i dont know, dont know of another car that does it.

yeah just need to know thread then can sort it in morning to get fitted in afternoon, welding not a problem

[Tony-Bones]

i dont know, dont know of another car that does it.

yeah just need to know thread then can sort it in morning to get fitted in afternoon, welding not a problem

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I have noticed that "JAP" imports have a "post" cat sensor? any one know why? i still feel it's a case of sensor first, thread second??

[lexus boy]

going to make a thread that will fit the senosr, the sensor has an attatched thread, all 1 thing, just need to weld on a female so it can screw in

i guess matt will know, but i dont think he is around at moment :D

[Tony-Bones]

going to make a thread that will fit the senosr, the sensor has an attatched thread, all 1 thing, just need to weld on a female so it can screw in

i guess matt will know, but i dont think he is around at moment :D

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Best of luck.. still love to know "why" there is a need for the post cat sensor??

[ColinBarber]

All ODB-II vehicles should have an O2 sensor after the cat. It is used to detect the cat is working properly. If it detects a problem the engine warning light will come on.

The O2 sensor(s) before the cats are used to set air/fuel mixture