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Old 01-02-2003, 12:06 AM   #1
Impulsivegoat23
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Member#: 25761
Join Date: Oct 2002
Location: Smyrna,TN
Vehicle:
2002 2.5 RS
Alpine White

Default Getting rid of my CEL??

I have a Ganzflow Intake, Borla header and Apex N1 2.5-3" on my MY02 RS. After the Borla went on I got a CEL as expected. I recently bought one of the MIL Eliminators from Pony Express. Put it on (with butt connectors and heat shrink since the O2 Sensor wires didn't really want to hold solder at all), and still have the CEL. I had the CEL checked before I installed the MIL Elim. and it gave the Low Heater Efficiency code, which I assume is the Cat inefficiency. My plan is to go back through and check my connections, but any idea what may help here? FYI I also reset the ECU a time or two and the light stayed off for about 30 seconds, I'm also getting poor gas mileage (15-17mpg, or is this about right for what I have? Or just the ECU learning off of the bugged out O2 reading?). Will a new high flow cat maybe have a lower operating temp and fix my CEL problem? Or might having the pre axle section of piping changed to 2 1/4" keep some pressure/heat and allow the stock cat to get up to operating temp? Short of removing the header which I'm not against..is there a surefire way of ridding the CEL from my system for sake of real problems.
Thanks
James
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Old 01-02-2003, 02:31 PM   #2
jeffg
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2001 WRX (GC8)

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You said that the code is "low heater efficiency" that does not sound like the same CEL code for the Cat efficiency. Do you know what the number was? The correct number is P0420. If you are getting something else, I am betting you have a bad O2 sensor. I never noticed that I got worse gas milage with my P0420 CEL.

Can you get the code checked again and tell us the number?

A new cat will not get rid of the P0420 CEL. Smaller pipe might help. What you need to do short of fooling the ECU with a device is add more heat to the system. The second O2 sensor in our cars is there to make sure that the cat is staying hot enought to work correctly. The Borla headers loose too much heat before the cat and therefore the ECU things its not working. I solved my CEL problem by wrapping the headers.

J
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Old 01-07-2003, 01:28 AM   #3
Impulsivegoat23
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Had the code pulled again .......it gave me P0031...I believe.... the guy that was there this time said it was in reference to the front O2 sensor......I'm pretty sure we didn't mess with the front O2 sensor when we put the header on.....but I'm gonna pull it tomorrow and check on it's condition (loose, burnt, unplugged....lol). Hopefuly I'll find something out. Sound familiar to anyone? When putting on the header...er just after? FYI I wrapped my header when installing it.....little sloppy around the 90 degree bends from the 2 inch wrap I was using but it's wrapped nonetheless. Thinking about going back with some 1" to get a better wrap job and maybe some more heat in the system.....guess that depends on wether or not I burned up the other O2 sensor. Thanks.
James
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Old 01-07-2003, 12:27 PM   #4
jeffg
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The 0031 code is very common in Subaru world. You need a new O2 sensor, your heater wire is bad.

The good thing is the dealer recently dropped the price on the part from $149 to $79. (it helped them avoid a recall)

J
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Old 01-08-2003, 08:15 AM   #5
DeusExMachina
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OMG EJ22T
FTW

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My problem is along these lines..however I don't get any codes from the front O2, I get a malfunction code from the rear O2 (P0136). My gas mileage is pretty bad, 15 mpg or so. I have the Brullen headers and a Cobb intake. Any ideas? Jeffg you seem to know your stuff.
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Old 01-08-2003, 12:36 PM   #6
jeffg
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The P0136 code is O2 sensor malfunction Bank1 sensor 2. That means you are correct, you have a problem with your rear O2 sensor. When you installed the brullen headers did you have to remove the rear O2? I dont know if you have the complete Brullen setup, or just a factory style replacement.

I would check to make sure you O2 is plugged in. If it is, then I would assume you also have a dead O2. Did the problem start soon after you did the header install? Sometimes new exhaust parts have an oil coating to keep them from rusting while shipping etc. As this stuff burns off it is really hard on O2 sensors, I a lot of people had problems when the borlas first came out.

J
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Old 01-08-2003, 01:17 PM   #7
DeusExMachina
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I did have to remove it, and I plugged it in. I did this over 6 months ago, the CEL has been coming for a month or so now. I'm going to do the test for it when I get home that is in the service manuals (WRX manuals, but should still be the same). Hopefully the root of all my problems is that its dead and thats it.
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Old 01-08-2003, 02:30 PM   #8
jeffg
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Good idea. Do the service test yourself and see if the O2 sensor works.

J
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Old 01-08-2003, 02:40 PM   #9
DeusExMachina
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It passed with flying colors. Maybe I'll take it to Subaru, tell them my gas mileage = crap, and ask them to let me know if its anything besides my intake and exhaust thats causing it.
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Old 01-08-2003, 03:06 PM   #10
jeffg
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Where did you do the test at? Right on the O2 sensor, or at the ECU harness. You might try it again from the ECU harness and see if there is abd wire in the harness or something. Just a thought.

J
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Old 01-08-2003, 03:20 PM   #11
DeusExMachina
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OMG EJ22T
FTW

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I didn't do any of the electrical tests because its cold and snowy out. But as far as the other tests are concerned, I was fine. Besides it was reading voltages, if the wiring is bad why would it do that? I have an appt for next week, I'll just mention it to them about my problem.
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Old 01-08-2003, 03:27 PM   #12
jeffg
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no idea, just throwing out ideas. You may have a connection, but one with a lot of resistance, that causes the signal to be out of normal bounds. Or maybe it never reaches a high enough operating temperature and therefore never actually works while still passing current.

Just throwing out ideas. Not like I can diagnose your car through the internet.

J
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Old 01-08-2003, 10:27 PM   #13
Impulsivegoat23
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Alpine White

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jeffg- Thanks.......did that comment about the wire running to the ECU.....go to me as well ...or is it just the oil thing burning off that *probably* caused mine and it's definitely the heater wire that is wrong. Thanks again.....gonna run out and get me a new one ASAP...Dealer only place to get a new one....what are the chances of burning the new one up as well?? Not likely because the oil is gone at this point??
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