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Old 05-27-2004, 01:21 AM   #1
lotusTT
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Default ECU/O2 sensor problems

I've been throwing a code P0130 saying my front O2 sensor was having problems for a while, even after I replaced the sensor, and now its showing a P1133. I did some research and it looks like my ECU is fried due to the bad O2 sensor. Subaru knows about this problem and has a fix for it and a new ECU, but of course the local dealer won't do it for me because of my turbo. They said if I put the car back to stock they could fix it. I really don't want to do that so I'm trying to find another solution. Any ideas? I've been trying to find a local stock MY00 RS to put my ECU in and have them take it to the dealer, but the search isn't going so well. Is there any other way to fix this?
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Old 05-27-2004, 01:28 AM   #2
White 2.5rs
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Hydra+HMist+PPG+35R=DEATH

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if ur o2 sensor is gone the ecu fries itself?
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Old 05-27-2004, 01:43 AM   #3
lotusTT
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apparently it does. "P1133 Front oxygen sensor heater circuit high input". Not sure how else the heater circuit would stop working properly. I thought that just a reflash would solve it, but the dealer was fairly adament that it wouldn't and that the ECU needed to be replaced. Maybe they were just blowing smoke up my ass, but they said they'd do it for free if I put it back to stock so its not like they were trying to sell me something.
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Old 05-27-2004, 02:05 AM   #4
White 2.5rs
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id borrow another ecu w/ a fresh o2sensor and see whats up....kinda dumb to do ALL that work
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Old 05-27-2004, 02:51 AM   #5
lotusTT
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If I had an ECU or another 2.5RS to borrow, I could just have the dealer give me a new ECU.
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Old 05-27-2004, 03:57 AM   #6
Drac9
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I have a 99ecu but that won't work for you, sorry.
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Old 05-27-2004, 09:46 AM   #7
yebokmj
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Default Buy Used, Try other dealership?

Your in CT how far from F&S auto salavage are you? You could always get a price on a used one. Put it in and if it doesn't solve the problem return it There is also the option of trying a more mod friendly dealership. Exeter Subaru, NH is know for that, it might be quite a drive but if it saves you money it might be worth the trip. I had this same problem with my MY98 RS turbo that my ECU was fried, my ecu was eventually replaced under warranty but only after I had stripped the car and returned to stock to be sold
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Old 05-27-2004, 04:43 PM   #8
White 2.5rs
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sorry to hijack but my downpipe is the invidia, and the sensor port is towards the back...can i run the wires longer w/ solder and shrink tube? or should i find another bung and have it welded?


alex
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Old 05-28-2004, 08:32 AM   #9
yebokmj
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Default O2 wire

O2 sensors use a special kind of wire that's not really soderable. You can use the but connectors though that come with "wire in O2 sensors" I don't know the name of them exactly but they are available by themselves. The way they work is you put the wire in the connector and kind of screw a top into the connector to clamp on the wire.
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Old 05-28-2004, 11:13 AM   #10
Santo Domingo 2.5 RS
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How can your ECu be fried by a bad O2 sensors? can you explain a bit more? do you have any other sings besides the CEL?
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Old 05-28-2004, 02:51 PM   #11
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Its running extremely rich is basically the only other problem. Also a couple misfire CEL's. Maybe its not "fried" but from what I've read on here and what the dealer told me, it needs to be replaced.
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Old 06-04-2004, 03:00 PM   #12
lotusTT
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Well I got the dealer to reflash the ECU today, and its still throwing the same code, P1133. So now it looks like either the O2 sensor is defective or the ECU is actually fried. I'm going to swap the sensor one more time and see where that gets me.
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Old 06-04-2004, 03:19 PM   #13
White 2.5rs
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have u checked each lead to see if the wires didnt get smasherd somewhere
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Old 06-04-2004, 06:37 PM   #14
lotusTT
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old O2 sensor installed and the CEL went away after starting the car 3 times. Not sure if it was the sensor or the reflash or a combination, but it seems to be better.
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Old 06-05-2004, 12:07 AM   #15
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are you still running extremely rich?
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Old 06-05-2004, 02:54 AM   #16
lotusTT
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nope, the smell of unburnt fuel is gone and my EGT's are back where they should be, its running great!
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Old 06-05-2004, 06:01 AM   #17
White 2.5rs
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nice
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Old 06-05-2004, 08:44 AM   #18
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sounds like the same problem I am having, time for a new front O2, you weren't by any chance having idle problems as well?
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Old 02-25-2005, 03:27 PM   #19
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Just wondering if you're still having this problem because I suspect it's due to some unexpected rich conditions - I have a P0130 as well and the OBD-II test shows that the O2 sensor is failing the middle-area (voltage out of range) and the lean area (again voltage out of range). After a reset, it would take a while but the code will come back, and based on my observation, it seems that those tests are made during driving (under some pre-determined condition by the stock ECU)
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