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Old 05-22-2011, 11:51 PM   #1
Leven 2.5
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Join Date: Feb 2008
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2006 Impreza i
Navy

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I used my buddies code reader, and it came up with: "P2097 Post Catalyst Fuel Trim System Too Rich Bank 1". Any idea what could be causing that? The CEL was solidly on, and the cruise control was blinking. Last week, I undid the battery to clear it, just to see if it would come back on, a few days later, it did.

I feel like there is definitely something shady with the gas tank. Last time I filled it, I swear it gargled gas back out at me. I always let the tank fill up all the way, and the pump shuts itself off. I rarely ever give it a couple more squeezes, although I have before (didn't do it this time).

The time before this (when I began to notice the problem), and found it difficult to get the pump out of the tank hole. It came out, but only with a bit of force.

I wonder if it caught on something, and I messed up some one-way type thing.

Any suggestions would be appreciated.

Car stats:

Automatic '06 Stock Impreza i
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Old 05-23-2011, 03:26 AM   #2
williaty
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Rear O2 sensor is pissed off. Reset it and get on with your life. Eventually, it'll get bad enough it'll come on frequently and then also throw other codes too. Then it's time to replace the sensor.
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Old 05-23-2011, 11:48 AM   #3
kewlboxer2
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umm. P2097. sure something isnt up with the cats? I got a letter for my 06 for the reflash so it doesnt melts the cats. How has your mileage been? Also what is your mileage? I think under 80k(?) is in cat replacement territory.
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Old 05-23-2011, 01:17 PM   #4
williaty
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2097 and it's companion just mean the rear o2 sensor was pegged either rich or lean for too many seconds in a row. As the O2 sensors wear out, they can get "stuck" in one state or another, which is why this code starts happening.
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Old 05-23-2011, 02:26 PM   #5
kewlboxer2
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Gotcha.
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Old 05-23-2011, 04:31 PM   #6
kero
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I got that code just recently with my uel catless setup. My local tuner advised to clear the codes and just drive the car, never came back up.

Maybe my car was just being touchy that day, who knows.

My rear 02 sensor really doesn't do anything since I have no cats, but I am sure both 02's get slammed with the stronger exhaust flow.
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Old 05-23-2011, 11:52 PM   #7
Leven 2.5
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When my friend hooked up the thing to check the code, he cleared it out (even though I didn't necessarily ask him to). I think I'm gonna get it checked out anyways.

I'm gonna call out a recall from a couple years ago for some one-way valve in the gas tank, I don't think it's been done yet. If they check that out, and find a legit problem, I want to get it fixed.

Heck, if I have to get a new o2 sensor and replace it myself, I'm fine with that. I just want the problem fixed.

Cars only got 43K~ miles on it.

On the plus side, I've got a friend with an '07 WRX, so as he does mods to his car, I can maybe cannibalize the stock parts from him if I ever need stuff (exhaust, suspension stuff, etc) .

But yeah, I'm still getting it checked out. I might ride it for a bit to see if the CEL and stuff comes back on, or if I notice anything else. I have had a couple issues where the car won't start up on the first try, but that's somewhat few and far between.

I just want the car to run and work like it's suppose to.
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Old 05-24-2011, 01:40 PM   #8
colorfull
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Since I changed my exhaust header for a TWE equal lenght unit, my car keeps throwing a P2096 code everytime I go on long road trips.
I checked the exhaust for leaks, changed/cleaned the Maf sensor, and changed the rear O2 twice already, but the code keeps coming back.
This code is the opposite of yours (post cat fuel trim too lean)

The car is a 2005 RS with the stock cat converter, and since the car drives just fine, I just decided to ignore the code and reset it everytime it appears, usually when I cruise at around 3000RPM at highway speeds.

I believe it is related to the fact that the TWE header is longer than stock, and also not heat shielded...
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Old 05-24-2011, 01:49 PM   #9
RaceFaceXC
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I also get the 2096 code with twe headers. Had the headers for 2 years, so I hope out the rear sensor going bad. The headers are wrapped but it needs to be redone, so that might be part of it. Code usually comes on after a freeway stint and sometimes goes away after lots of city driving. My fuel trims and errors are all good and unchanged from before the code and the front O2 is happy so I don't worry about it very much.
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Old 05-24-2011, 09:08 PM   #10
Leven 2.5
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yeah, if it comes back on, I'm gonna take it somewhere and see what they say.

If they find an apparent problem, I'll get it fixed. Just seems like some very annoying awful code that just exists to be annoying
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Old 05-23-2014, 03:33 PM   #11
mDemi
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Was it the rear o2 sensor?
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Old 05-24-2014, 11:08 PM   #12
Subie-Lifer
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Buy the $3 insert it goes in the O2 bung and then screw in the O2. I think they call them anti-foulers. People use them to get buy emissions with bad cats
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Old 05-24-2014, 11:24 PM   #13
JohnM10
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Quote:
Originally Posted by Subie-Lifer View Post
Buy the $3 insert it goes in the O2 bung and then screw in the O2. I think they call them anti-foulers. People use them to get buy emissions with bad cats

Got a link for that? I am due in for an emissions test for a RI inspection.
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Old 05-25-2014, 01:07 AM   #14
williaty
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Anti-foulers and MIL eliminators MUST NOT be used with the 05 and newer Impreza!
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