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Old 02-13-2009, 07:04 PM   #1
bnr34rb26dett
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Member#: 188424
Join Date: Sep 2008
Chapter/Region: Tri-State
Location: Under your car
Vehicle:
2012 640WHP STI

Unhappy CEL P2096 Post catalyst fuel trim system too lean (Bank 1) catless with MIL elim

i went catless, installed MIL eliminator, and did 05 rs engine swap with a motor that has 22k miles on it.
now I got the code pulled and its a P2096.
"Post catalyst fuel trim system too lean (Bank 1)"
apparently
"it looks like its only happening on 05MY models... as i read somewhere the rear o2 sensor actually has pulsating ohm resistance, and not a stedy one.."
i dont know if this is true or not, can i get a confirmation?
and is anyone else getting this code?
im lost as to fix this problem. any comments/ suggestions would be great!
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Old 02-21-2009, 09:47 AM   #2
bnr34rb26dett
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any solutions?
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Old 02-21-2009, 02:15 PM   #3
munkis
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This code is usually caused by a faulty front air fuel ratio sensor. But i suspect your Mill eliminator is causing the issue. If the ECM sees a steady 0 volt reading from the rear oxygen sensor it will cause this code.
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Old 02-23-2009, 09:23 AM   #4
ndmx52
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2006 LGT - sTg 1
BSM

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I don't know if this is going to help but here goes...

I've been suffering from this code on my LGT for about 4 months. My car is completely stock so that may not help you narrow it down. I have had my exhaust inspected for leaks multiple times, replaced my rear O2 sensor, had my front Air Fuel Sensor replaced. My Subaru dealership was lost for solutions.

But what I believe caused the problem was a cracked hose going too my boost gauge that was causing a vacuum leak. More air being drawn into the engine than the MAF sensor was calculating = lean condition.

Hope that helps.
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Old 02-23-2009, 10:05 AM   #5
bnr34rb26dett
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hmmm, thats interesteing. i was thinking its caused by the MIL eliminator but i do have a hybrid intake system installed.
this might have affected CEL but i doubt it. but my car is MAF. maybe i wil ltake that out and see what happens.
my car is NA by the way.
no boost ftl
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Old 02-24-2009, 08:38 AM   #6
ndmx52
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2006 LGT - sTg 1
BSM

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Well, it looks like my vacuum leak wasn't the main problem for me. My CEL came back on last night. So I'm back to being clueless myself.
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