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Old 04-16-2002, 04:39 PM   #1
Scooby Newbie
Member#: 16261
Join Date: Mar 2002
Location: Buffalo, NY
2000 Impreza 2.5RS
Blue Ridge Pearl

Post Quick CEL question

Ok, quick CEL question: If I have a CEL associated with the wide band O2 sensor (2nd O2 sensor in line) reading irregularly, will this cause my vehicle's ECU to run in open loop mode (preprogrammed fuel maping)? If so, what can be done.
This syptom is a result of purchasing a Random high flow cat from Cobb Tuning, which I was forwarned about, so Im not complaining, just trying to understand my vehicle better. Perhaps someone else here has had the same problem and has dealt with it some how. An inline resistor perhaps? Thanks!
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Old 04-16-2002, 05:25 PM   #2
Scooby Guru
Member#: 2958
Join Date: Nov 2000
Chapter/Region: NWIC
2001 6.0?RS


I have had this same CEL light for quite a while, and I am pretty sure the car does not run in open loop preprogrammed mode.

does anyone know for sure?

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Old 04-16-2002, 05:48 PM   #3
Scooby Specialist
Member#: 2817
Join Date: Nov 2000
Location: NYC and Troy, NY
2001 Impreza 2.5RS


I can almost guarantee you have a P0420 Catalyst Inefficiency Code. If so, adding some kind of a resister between ECU and rear O2 would help. The car doesn't run in open loop. Someone was selling that here a while ago.
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Old 04-17-2002, 03:07 AM   #4
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Member#: 6551
Join Date: May 2001
Chapter/Region: MWSOC
Location: Carol Stream, IL
'01 GC8 Dinged STM
'09 Concours 14 ABS Black


sounds like you have an O2 sensor slow response code...no it doesn't run open loop for that...it will however decrease your performance slightly...wrap the section of the pipe between the flange and the cat...it'll fix it.

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Old 04-17-2002, 01:39 PM   #5
Scooby Specialist
Member#: 16085
Join Date: Mar 2002
Chapter/Region: SCIC
Location: Chatsworth, CA
2005 STi


i got this code on sunday coming back from san francisco after getting my exhuast installed. i got it cleared and its been fine so far.
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