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JDM catalytic converter's oxygen sensor

 
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Old 01-22-2012, 08:49 AM
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JDM catalytic converter's oxygen sensor

Dear friends,

I have Honda Prelude 1991 4ws Jdm. the car has a catalytic and a oxygen sensor.. The cluster also has a catalytic converter symbol and its light up.. i guess the sensor is faulty..

when i removed the catalytic converter, i found that the sensor wire is already destroy..now the problem is the sensor is seized and the size of the sensor is a bit smaller compare to the sensors that have in upstream.. the size of the hex nut of the sensor in about 18mm compare to the upstream sensor is 22mm..

my question is can i replace the sensor with a sensor that same size like in the upstream sensor? do they have different specification or current flow? i have no idea about this one.. see the pictures..the last pic is my used upstrem o2 sensor


Thanks
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Old 01-22-2012, 01:56 PM
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Re: JDM catalytic converter's oxygen sensor

That's not the normal 3rd gen setup. 3rd gens don't have an o2 sensor in the cat. You said it's a JDM Prelude...is it a 4th gen by any chance? The first model year of JDM 4th gens was 1991. Post a pic of your car.

1991 model year 3rd gens have either 1 or 2 o2 sensors. If you have a b20a5 you would have 2 o2 sensors in the exhaust manifold, before the downpipe. If you have a b21a1 you would have a single o2 sensor in the downpipe near the flex portion.

Regardless of what generation you have, I wouldn't install a used o2 sensor unless I didn't have any other options. But that's just me.
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Old 01-23-2012, 12:09 AM
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Re: JDM catalytic converter's oxygen sensor

hi Luzer,

im sure its a prelude from3rd generation probably kz model as mentioned in the manual book. It has b2o engine with 2 sensors at the upstream. what i think its a original setup since the cluster got the catalytic o2 symbol. In additional since the o2 in the catalytic converter failed my engine idles so badly~~~and the smell like rotten egg release from the exhaust.

I try to remove the sensor and fit in the other sensor into the catalytic converter.btw this is my prelude's pic

Last edited by Arif; 01-23-2012 at 12:41 PM.
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Old 01-23-2012, 08:31 AM
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Re: JDM catalytic converter's oxygen sensor

The 2nd sensor is just a CAT temp sensor. Earth the wire from the ECU on the chassis and it will shut the warning light up.
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Old 01-23-2012, 11:16 AM
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Re: JDM catalytic converter's oxygen sensor

JDM DOESN'T HAVE o2 SENSORS.USDM DOES.Also JDM doesn't have egr valves.Anyone who has ordered a JDM B20a would know that.
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Old 01-23-2012, 11:20 AM
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Re: JDM catalytic converter's oxygen sensor

hi Merlin,

owh~~yeah make sense but what is the function of CAT temp sensor? what i know its only to measure the temperature of the exhaust?correct me if i wrong but if its link to ecu.There must be something to do with fuel management or anything related?i have no knowledge about this


Thank u
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Old 01-23-2012, 11:40 AM
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Re: JDM catalytic converter's oxygen sensor

Quote:
Originally Posted by Arif View Post
Dear friends,

The cluster also has a catalytic converter symbol and its light up.. i guess the sensor is faulty..
can you take a pic of this?
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Old 01-23-2012, 12:30 PM
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Re: JDM catalytic converter's oxygen sensor

here i got the pictures.I also attach the gauge diagram i got from the manual..the CAT warning symbol located after the check engine light warning.(the empty slot)
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Old 01-23-2012, 12:32 PM
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Re: JDM catalytic converter's oxygen sensor

Quote:
Originally Posted by Arif View Post
hi Merlin,

owh~~yeah make sense but what is the function of CAT temp sensor? what i know its only to measure the temperature of the exhaust?correct me if i wrong but if its link to ecu.There must be something to do with fuel management or anything related?i have no knowledge about this


Thank u
Its simply to say that the CAT is over heating. All the engine management is done by the first sensor in the downpipe. In the UK all JDM cars produced before 1995 dont have to pass a CAT emissions test. We all fit decat/test pipes and earth off the 2nd sensor as it is not needed. Even if you still have the CAT in place you can earth it off with no issues. Earth it like this:

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Last edited by merlin; 01-23-2012 at 12:35 PM.
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Old 01-23-2012, 01:58 PM
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Re: JDM catalytic converter's oxygen sensor

Sorry my bad, I guess I didn't consider the different emissions requirements for other markets. USDM 3rd gens don't have that heat sensor or that indicator light.

I own 2 JDM b20a engines, but I didn't order either one myself.

I'm glad someone who knows more about them posted up with the answers for you.
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Old 01-23-2012, 08:54 PM
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Re: JDM catalytic converter's oxygen sensor

Good work MERLIN. Remember/....If you ever order a JDM B20A and your state requires emissions, You're gonna have to keep the USDM intake and exhaust manifold so the EGR can get it's hot air. Otherwise you'll fail the NOx part of the test everytime. Trust me on that.
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Old 01-23-2012, 09:22 PM
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Re: JDM catalytic converter's oxygen sensor

is this like one of those California emission cars and not jdm?
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Old 01-23-2012, 09:51 PM
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Re: JDM catalytic converter's oxygen sensor

This is a real JDM intake that was on my B20A that I ordered. Notice there is no provision for an EGR valve.
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