Decat = CEL solved, maybe
#1
Decat = CEL solved, maybe
Installed Decat pipe a couple of weeks ago and CEL came on. Searched this site and found that is the usual reaction to the decat. However my mechanic buddy and checked the code. 420 which is cat failure. So in a moment of "try anything" we put the old upstream 02 sensor in the downstream position. Guess what? No CEL. Have driven back and forth to work last three days and still no CEL.... fingers crossed.
#2
Installed Decat pipe a couple of weeks ago and CEL came on. Searched this site and found that is the usual reaction to the decat. However my mechanic buddy and checked the code. 420 which is cat failure. So in a moment of "try anything" we put the old upstream 02 sensor in the downstream position. Guess what? No CEL. Have driven back and forth to work last three days and still no CEL.... fingers crossed.
#4
Did you disconnect the battery?
Mine would sometimes go for weeks without a CEL, sometimes a couple of days.
I can't think of a logical reason why one O2 sensor would read differently.than the other unless they are made to read differently.
If that's the case you could be opening up a can of worms on the upstream.
Mine would sometimes go for weeks without a CEL, sometimes a couple of days.
I can't think of a logical reason why one O2 sensor would read differently.than the other unless they are made to read differently.
If that's the case you could be opening up a can of worms on the upstream.
#6
On a straight pipe setup? Why would it matter? You could be right but unsure why position of that sensor would matter with no cat and the exhaust flow still the same.
Last edited by CaymanRotary; 07-29-2020 at 06:20 PM.
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Interesting... that's pretty clever. The rear O2 sensor is not really important like the front one is. Using two fronts might work but have to see. Would still think it would just trigger some other exhaust code eventually.
#10
SORRY IF i WASN'T CLEAR. NEW UP STREAM 02 SENSOR IN PLACE....used old failed upstream 02 sensor in downstream position. CEL still out. No code.
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SORRY IF i WASN'T CLEAR. NEW UP STREAM 02 SENSOR IN PLACE....used old failed upstream 02 sensor in downstream position. CEL still out. No code.
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The upstream 02 sensor that we used was not showing any value...0, so replaced with new one. That old one is the one we put in the downstream position but it was showing 1400* at 2500 rpms. Hopefully it is fooling the ECU and will continue. Only time will tell. I'll get back on this in a couple of weeks or when the CEL comes on.
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CaymanRotary (07-29-2020)
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