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Old 02-11-2005, 09:42 AM   #1
kpmatt00
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Default O2 Heater Sensor

Anyone that has done a JDM swap reattach the O2 heater sensor to clear the CEL and be compatible for emmissions? Is this the best route to go? Any info is appreciated..Thanks, Matt
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Old 02-11-2005, 11:18 AM   #2
kpmatt00
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Anyone know about this?
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Old 02-11-2005, 11:41 AM   #3
fragment
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I'm working on this right now. My twinscroll swap didn't leave enough wire on the sensor to reach the connector by the boost controller, so I cut and spliced. Then I got a CEL for Lean Bank 1 and saw that my A/F was reading 26:1 at idle. Can you be a bit more descriptive of your issue?
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Old 02-11-2005, 12:29 PM   #4
kpmatt00
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I had to get a used wiring harness because the one that came with my engine was totally destroyed, and time to rewire and all that was too much. So I have enough wire to reach the connector, but i left the sensor off and it gave me a cel. I guess I can hook up the O2 heater and just mount it so it works but does nothing?? I am thinking this will cure the CEL, and I also want to pass emmisions, so other ways I have thought about may cause a problem once hooked in to the the emmissions test. I also dont have an a/f gauge, maybe it would be a good idea now. I am getting it tuned in about 2 weeks, and i am nervous as hell right now, havent' put more than half throttle, it boosts up quick, havent seen more than 15 psi, but i try to keep it at 0.
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Old 02-11-2005, 01:03 PM   #5
kpmatt00
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Fragment-Was just thinking about it, what kind of turbo/boost do you run, and how do you keep it up higher twds 19 or so all the time. I have read people have replaced the spring on teh waste gate??
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Old 02-11-2005, 01:16 PM   #6
fragment
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I'm really confused. You plan on running without the front O2 sensor? How do you expect the ECU to calculate fuelling? I doubt you'll meet emissions without an operational sensor mounted in the exhaust stream.

To answer your second question, I'm not running at all right now; the first thing I did after getting the engine to start and run ok was to send my ECU to KingPin. Good ol FedEx sent my ECU to the wrong coast, so I'm looking at a total of 8 - 10 days down time
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Old 02-11-2005, 01:56 PM   #7
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I'm running both 02 sensors in my setup and i have no CEL's. Why are you not running o2's?

-B
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Old 02-11-2005, 01:59 PM   #8
kpmatt00
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It's the O2 heater sensor control circuit code cel. there is no o2 senser in the intake, only exhuast. i am confused now, maf is for that kinda stuff.
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Old 02-11-2005, 02:08 PM   #9
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Quote:
Originally Posted by kpmatt00
It's the O2 heater sensor control circuit code cel. there is no o2 senser in the intake, only exhuast. i am confused now, maf is for that kinda stuff.
What are you talking about? Your MAF is in your intake, your 02 is in your exhaust. What is the code you are seeing?

-B
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Old 02-11-2005, 02:16 PM   #10
kpmatt00
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I have an o2 in the exhaust pipe, but not up front by the boost controller in the exhaust.. I didnt see any spot for it?? So i have wires not connected to anything. I am at work, dont have the number on me but it read 'senser heater control cirucuit'. Is there another spot were I am just overlooking?
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Old 02-11-2005, 02:17 PM   #11
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Quote:
Originally Posted by kpmatt00
It's the O2 heater sensor control circuit code cel. there is no o2 senser in the intake, only exhuast. i am confused now, maf is for that kinda stuff.
MAF measures how much air goes in; yes. O2 sensor is used to measure the air/fuel ratio so the ECU knows if its adding too little or too much fuel to that air.

I think you need to sit down and ask yourself if you are willing to risk your expensive new motor to your limited understanding of how it works.
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Old 02-11-2005, 02:23 PM   #12
kpmatt00
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Ok, I do understand that, what you are saying. There also seems to be no spot on the exhaust man for an o2 sensor to plug in...I know where the old one was, and I see nothing. I was wasnt thinking before, trying to write and work at the same time in hopes to fix this so I can drive it to get it tuned sat.
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Old 02-11-2005, 05:03 PM   #13
fragment
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Quote:
Originally Posted by kpmatt00
Ok, I do understand that, what you are saying. There also seems to be no spot on the exhaust man for an o2 sensor to plug in...I know where the old one was, and I see nothing. I was wasnt thinking before, trying to write and work at the same time in hopes to fix this so I can drive it to get it tuned sat.
On the USDM WRX, the front O2 sensor mounts in the up-pipe before the first catalyst. On the JDM ver8 with twin scroll, the front O2 sensor mounts in the top of the downpipe, just after the turbo. This is before the first catalyst in the downpipe.
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Old 02-11-2005, 05:15 PM   #14
kpmatt00
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Ok thanks fragment. Yeah, that is the prob, I have a custom DP so I guess I have to weld a bung on it just after the turbo and put a O2 sensor in it. Do you have any idea of the USDM wrx O2 sensors are ok to use, Ralli Spec told me today they weren't sure if it would. I will call King Pin on the way home, see what they say. Thanks for the insight. Matt
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Old 02-11-2005, 05:18 PM   #15
fragment
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I've heard others have used the WRX O2 sensor which makes things simple. Its got a longer wire than the JDM one, so it can still plug into the connector by the boost controller.
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Old 02-11-2005, 05:22 PM   #16
kpmatt00
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Ok, I have both, so I will try that, once I get that damn bung on. Well almost done I think, since this is the only CEL code I am throwing. THEn off to the tuners, and hopefully agw. Thanks for teh help, always appreciated. -Matt
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Old 02-18-2005, 11:14 AM   #17
bebeu
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Hello
I haven't the rear OČ sensor on my STI 8 JDM.
So I have a CE ==> rear heater problem.

How can I fix this ?
Thanks a lot.

Last edited by bebeu; 02-19-2005 at 06:49 AM.
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Old 02-25-2005, 06:20 PM   #18
bebeu
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up

please.
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Old 02-25-2005, 10:03 PM   #19
fragment
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Go the the electronic section of Scoobymods.com There is a thread there on how to make an O2 sensor bypass circuit.
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Old 02-27-2005, 10:56 AM   #20
bebeu
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This mod is when you use a decat.

I have a catalyser, but i haven't got the rear OČ sensor.
So i have a CEL : SENSOR Heater.

What can I do ?
Thanks a lot.
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Old 02-28-2005, 04:07 PM   #21
kpmatt00
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Well I fixed mine, no CEL, but I welded an O2 sensor just after the Turbo in the DP. I Think those COBB stages eliminate the rear O2 sensor, someone must know what to do.
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