2005 OBXT Stutter on Acceleration and P2096 Code

Asked by Blaizon Dec 17, 2019 at 10:12 PM about the 2005 Subaru Outback 2.5 XT Limited Wagon

Question type: Maintenance & Repair

My car has been stuttering/surging on acceleration for a while now. It has a
check engine light and a P2096 code that tells me that the post catalytic O2
sensor says that it’s running too lean. Some of the things I’ve done to try to
fix it are:
- Cleaned the MAF sensor
- Replaced the fuel filter
- Replaced the upstream O2 sensor
- Replaced air filter

After I got the car back from the shop with a replaced O2 sensor the car was
running great but on more acceleration, I noticed the surging again and
when it persisted, the CEL came back on. The only modification is that I
removed the intake resonator but I sealed the hole and I’m pretty sure I had
this problem before I did this. I’ve heard that it could be a faulty TPS, but I’m
honestly out of ideas. Any help or advice would be greatly appreciated

3 Answers


So you replaced the REAR O2 also? If it's new then maybe it's not getting hot enough to function correctly, so check the wires and connector to it. I ran into this once when I moved a rear O2 further back (downstream) on a custom midpipe, wherein it didn't get hot enough to function without a software trim.

The rear O2 sensor has not been replaced. I replaced the upstream one before I read the code. I'll check the connection though. Do you think the rear one should be replaced?

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