CEL Front o2 sensor

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jamesA

jamesA

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I've been pondering this for a while. I had gotten a Bosch o2 sensor when I started throwing the code, but it oddly enough went away so I never installed it.

When I put on my DC header, it came back and I installed a generic o2 sensor that I had to splice shit together, (couldn't find the Bosch one after the move to my 2nd apartment) well the code eventually came back so I said fuck it and I got another Bosch plug in o2 sensor, tightened it down reset my ecu and all was fine for like 3 months.

Two years later my CEL will come on and off over 3 months time, what am I missing? I know its in, and I doubt it doesn't work, what else can I do so this damn CEL isn't always staring me in the face?

It really makes no sense, because i still get the same gas mileage and the car runs just fine.
 
I used the stock plug off my original o2 and spliced them with the little black splicer box that came with the generic o2 sensor. The stock harness leading to the ECU is still intact for when I put in the non-generic o2 sensor. The wiring and harness is intact exactly as it was when it rolled off the assembly line.
 
ahh, i would replace that splicebox with some solder and shrink tubing if you can.
 
I did. Its a stock harness o2 sensor thats in there right now. It was one that was made especially for 99-00 Si's, clipped right into the stock harness. Which is why I'm confused as to why I'm still getting a CEL. I wonder if its not getting the readings because there is a header on the car instead of the stock manifold.
 
if the cat was bad wouldnt the 2nd 02 sensor be posting the problem?
 
Its acting like its not getting readings from the front o2 which is before the cat, the rear o2 has never caused a CEL.
 
Maybe you have your black wires crossed that is what happened to me. Switched the wires around and ta da!!
 
Its a plug and play o2 sensor, there is nothing to switch without splicing...
 
obd2 compares pre cat and post cat o2 readings.

its possible that its clogged, and getting too hot, and throwing a code.
 
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