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Old 03-18-2004, 07:19 PM   #1
PeteDucati
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Join Date: Oct 2003
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Location: '04WRX-Axis ej257, IPT 4eat.
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DB18g/EWG - F/S $8K

Default How to pull CEL code?

Is there an easy way to pull codes? My '04 threw the CEL light this evening.. like a genius I disconnected the battery and restarted the car, the light didn't come back on.
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Old 03-18-2004, 07:46 PM   #2
Mulder
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You need access to an OBDII scanner to pull the code. Autozone does it for free, there should be one near you in NJ. There are also many members in Tri-State with scanners and you could post there for help.
Next time you see the CEL, do NOT disconnect the battery to clear it. Doing so erases the code from memory so it can't be read later to help find the problem, and you then have to wait for the code to be set again. Which it probably will, since a reset does not actually "fix" anything. Pulling the battery also resets all the learned data cells in the ECU to their zero defaults so it has to begin the learning process all over again, this isn't something you want to do for no reason.
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Old 03-18-2004, 08:40 PM   #3
PeteDucati
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CNC 'd heads, cams
DB18g/EWG - F/S $8K

Default

I realized all of those things AFTER I grabbed my 10mm and did the unthinkable. I have a wedding in Pennsylvania (100 miles) tomorrow and I was worried the light may have indicated a serious problem.. hopefully it won't come back.

If it were an O2 sensor code.. the CEL would stay lit? My EGTs have been much lower ever since I installed the GP Moto headers.. but the EGT probe is also farther from the exhaust port (along with the O2 sensor). Either the probe is too far for accurate readings or the car is running a bit richer. My ecu is still stock, along with my boost..
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Old 03-18-2004, 09:36 PM   #4
Mulder
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Whatever code it is/was, if the problem is detected again after the reset the light will come on again. The requirements to trigger the light differ for various conditions, some have to be detected more than once on successive drive cycles for the code/light to set, others trigger it right away. Also some conditions may not be detected by the ECU until it actually does its testing for that parameter, such as the catalyst efficiency testing which is only performed under extended steady-throttle driving as on the highway.
Again the important thing to remember is that regardless of how serious or not the problem that turned on the light, doing a reset has no effect on the cause and does not make the actual problem go away.
Unless the CEL is flashing, which indicates a real-time misfire that requires immediate attention, the car should be perfectly safe to drive with the light on until you can get it serviced.
You may want to consider buying yourself a scanner to have on hand since your car is modded and you work on it yourself.
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