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Old 03-28-2005, 04:29 PM   #1
jlee81
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Default O2 sensor problem. I need your help please...

I do not own Subaru Impreza but I think subaru owners have more experience about tuning than I can ever be.

I have 2004 CLK55 and installed Kleemann Stainless headers and downpipe.
Because of downpipe I had to remove 1st two cats and relocated second O2 sensors behind the 2nd cats. Then I started to get CEL lights.
I first drove the car when the second O2 sensors were not plugged in behind the second cats. Basically they were hanging outside, and it was a rainy day.

Could the sensors be damaged in this condition? Is this most likely why I am getting the malfunction light? I hope this is not a big problem. Please help me with your experience.
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Last edited by jlee81; 03-23-2006 at 11:52 AM.
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Old 03-28-2005, 05:03 PM   #2
kpmatt00
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Where were teh O2 sensors first located? Leaveing them out will def throw a cel, i was missing one when i did an engine swap, checked the code and sure enough it was because missing O2. I had to actually drill a hole in the down pipe and weld a new bung in and then the CEL cleared. Maybe on Merc. the CEL dont clear themselves and you have to bring it to the dealer or Auto shop to have it cleared. I would def have it plugged in and see what CEL you are throwing. As far as damging the 02 sensor, I am not sure, it is def possible but I would check the CEL.

-Matt
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Old 03-28-2005, 05:21 PM   #3
jlee81
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they are plugged in now behind the second cats. They were origianlly located behind the first cats. There are 4 sensors total. 2 before the first cats and 2 after first cats. Since I removed the first 2 cats, I relocated the sensors behind 2nd cats. I was wondering if driving them unplugged could conteminate or damage the O2 sensors, which could cause CEL lights. I cleared them with the OBD2 scanner but they keep coming back. Could it also be wiring problem?
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Old 03-28-2005, 05:28 PM   #4
2phless
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Exposing them to the elements can hurt them. They heat themselves so they might have burned some junk onto them. Tar or roadkill or something interesting that they are not used to being exposed to. The heaters may also have burned out trying to maintain temp with out the help of the hot exhaust. Cold water splashing on hot O2 sensors would definitely kill them.
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Old 03-28-2005, 05:47 PM   #5
AaronWRX
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What code are you pulling exactly?

Are they bosch sensors?

Does the car drive fine? In subarus, we have two sensors, the one before the cat (before our turbo too) is for adjusting AFR and therefore should never be removed, relocated, or simulated.

The one behind our cat, is only to make sure our emissions equipment is working properly. We have to simulate both the heater element inside the o2 sensor, and the o2 signal too to completely eliminate the sensor.

It sounds like you have dual exhaust? If you have bosch sensors, you will find better information on ls1tech.

I'm using the baker electronix dual02sim on my suby that most of the ls1 crowd uses and im using their heater sim too. (cost me 30 bux)
http://mysite.verizon.net/vze7erz1/

Nasioc thread about O2 simulation:
http://forums.nasioc.com/forums/showthread.php?t=427972
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Old 03-29-2005, 03:23 AM   #6
jlee81
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First of all, Thank you all for your help.
I have 4 bosch O2 sensors. The error codes are P0141 & P0161. Heater Circuit Malfunctions. What should I do first?
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Old 03-29-2005, 09:19 AM   #7
kpmatt00
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Quote:
Originally Posted by jlee81
First of all, Thank you all for your help.
I have 4 bosch O2 sensors. The error codes are P0141 & P0161. Heater Circuit Malfunctions. What should I do first?

I had those codes (heater malfuntion) when my O2 sensor was not installed, so I am wondering if yours are not working at all therefor throwing initial heating failure codes.
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Old 03-29-2005, 07:20 PM   #8
antimullet
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If you find your o2 sensors are in good condition, then go spend two bucks at Autozone or advance auto and buy two spark plug antifoulers. Then drill the center of them so your 02 sensor will fit. Then put these in the 02 bungs, the screw in the 02 sensors. one on each works for me, some folks need two. But what your doing is getting the 02 sensor out of the hotter air that the rear 02 sensors look for to indicate a failing cat. In your case no cats, so you get a 02 sensor code.

This will effectively trick the 02 sensors by setting them back farther in the bunghole (huhuhe he said bunghole) and cooling the air passing over them...
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Old 03-29-2005, 09:00 PM   #9
AaronWRX
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Hmm... the p0141 code is weird.. there are a number of codes associated with the heater element... It alsmost sounds like you car doesnt even think you have your O2 sensors installed. If the sensor isnt borked, it should be able to send power to the heater element, and warm it up, even if it's just dangling in free air.

Since you have bosch sensors, I would cut your losses and spend the 30 bux on the baker electronix dual02sim and heater sim. I'm pretty sure you only need to buy 1 heater sim and 1 dual02sim even though you need to simulate 2 sensors.
Dual02sim: http://mysite.verizon.net/vze7erz1/id1.html#dualo2mod

Heater sim:

If you slide back the shielding around the wires on the O2 sensor, it will most likly have 4 wires. Tell me the colors and I will tell you how to wire this stuff up.
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