CEL after doing a cat-less downpipe swap - Subaru WRX Forum
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#1 Old 06-29-2009, 07:46 PM
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CEL after doing a cat-less downpipe swap

Hi all,

I just swapped my 2003's exhaust and downpipe for an HKS Hi-Power two days ago, and yesterday on the highway the Check Engine light came on. I understand this is pretty common because the oxy sensor triggers it without cats.

I have two questions:
(1) What's the best and easiest way to "fix" the oxy sensor tripping?
(2) What's the easiest way to get my CEL reset?

Thanks a lot!

-gT
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#2 Old 06-29-2009, 08:04 PM
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Engine Management would be the best, because then you would be getting more out of just putting on the DP. You can reset the ECU, but unpugging your battery and letting the power drain and then hook it back up. Search CEL fix either here, google, or NASIOC and you can find several other "ways" to fix the CEL.

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#3 Old 06-29-2009, 08:50 PM
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Thanks! I'll try disconnecting the battery and seeing if the CEL comes back, but it most likely will, huh? I'd love to do a Vishnu ECU engine management upgrade, but I'll need a cheaper solution for the short-term. I'll Google and see what I can find.
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#4 Old 06-30-2009, 12:15 AM
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The CEL will come back. Look at either the Cobb AP or Opensource tuning. Both are widely supported by tuners.

Joshua
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#5 Old 06-30-2009, 08:39 AM
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I think a 2.2k ohm resitor in the blue wire of the O2 senor will fix the CEL. But EM is need to get the max out of your mods.
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#6 Old 06-30-2009, 01:48 PM
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I would go to an Open Source Stage 2 map if you can find someone near you with a laptop and cable. That would defeat the CEL's and make the car run better.

My name is Ken and I am a HP Junkie.
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#7 Old 10-21-2011, 01:21 AM
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O2 sensor fix

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Originally Posted by oldfartracer View Post
I think a 2.2k ohm resitor in the blue wire of the O2 senor will fix the CEL. But EM is need to get the max out of your mods.
so i would have to solder the resistor in the blue wire by cutting it then solder both ends of the blue wire on to the resistor? if i went with this option would i still be able to reinstall the oem downpipe and pass emissions without having a CEL pop up? if i do go with a cobb accessport would it allow me to turn off the CEL permanetly or would i have to erase the codes everytime they popped up? -thanks
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#8 Old 10-21-2011, 07:33 AM
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No. The resister trick is for the EGT probe,not the rear O2 sensor (P0420 code). Either get some engine management or use spark plug or buy/make a mechanical fix.

Homebrewed tuned with Opensource!
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#9 Old 10-22-2011, 01:15 AM
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2.2 trick

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No. The resister trick is for the EGT probe,not the rear O2 sensor (P0420 code). Either get some engine management or use spark plug or buy/make a mechanical fix.
spark plug? u mean putting a spark plug in the O2 hole? 2.2 resistor in the egt would i have to solder it in or can i just plug it in? turboxs has a uppipe that comes with the 2.2 resistor but dont know what type it is
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#10 Old 10-25-2011, 05:10 PM
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i read of a lot of people doing foulers on the old 350z forum not sure if they will work with these but you can buy them at any auto part store for like $10... But im not promising it will work i also have a buddy who did it on his civic si and it worked for him and he also pass's emissions like that too
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#11 Old 10-26-2011, 12:22 AM
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Quote:
Originally Posted by ejs0806 View Post
i read of a lot of people doing foulers on the old 350z forum not sure if they will work with these but you can buy them at any auto part store for like $10... But im not promising it will work i also have a buddy who did it on his civic si and it worked for him and he also pass's emissions like that too
ive heard the same on here. ill probably end up doing the fouler fix since a cobb cat downpipe cost a ship load. -thanks
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#12 Old 10-26-2011, 06:03 PM
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If you think that is expensive...try buying a turbo back exhaust for the 3rd gen WRXs.

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"When in doubt...flat out" - Colin McRae
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#13 Old 10-26-2011, 08:21 PM
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Quote:
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If you think that is expensive...try buying a turbo back exhaust for the 3rd gen WRXs.
Look at a cat back for an R-35, lol. But its true, most the stuff for the 3rd gen seemed to get inflated.

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#14 Old 10-26-2011, 08:25 PM
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Look at an exhaust for a 997 911 Turbo

FP GT35R MoTeC M800 AndrewTech PPG'd Wagon - 513AWHP
06 Mazdaspeed6 280/330
- Matt
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#15 Old 10-26-2011, 08:31 PM
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Now you are just teasing Matt. Lol.

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