2012 Impreza Engine Surging, P2097

[bjagd02]

Hello,

I've been receiving a P2097 code for downstream O2.  I've made the following changes since receiving this code:

1. Replaced both up and downstream O2 sensors

2. Replaced air filter

3. Replaced spark plugs

4. Replaced MAF sensor

5. Replaced MAP sensor

6. Replaced ICV valve

7. Ran cataclean through fuel system

8. Cleaned throttle body

9. Performed idle reset

 

Even after making all these replacements, the code is still present and the engine surges/pulses.  Any suggestions on what to try next?  Faulty catalytic converter? Exhaust leak somewhere?  Someone on another forum even mentioned the knock sensor?

If needed, I can post ODB readings.

Thanks!

[Rampage]

Click this link and download the FSM. (195 MB)

https://sl-i.net/FORUM/showthread.php?18087-Subaru-Factory-Service-Manuals-

Click the link under Impreza at 2012. Another page will open. Click the big green download button and save the zip file. Another page with an add will open, just close it.

Extract the zip file to an empty folder.

Using File Explorer, expand the Engine Section folder then expand Engine Diagnostics and open the "19 Diagnostic Procedure with Diagnostic Trouble Code DTC pdf" file. 

Scroll down to page 289 (DTC P2097). There are 6 pages of things to check.

They refer to a lot of connectors. To locate them on the vehicle do this. Get the connector number. Go to the Wiring System Section and you will see several files with Wiring Harness in the name. Open them and find the connector number. That location is where you will find it.

[bjagd02]

Thank you Rampage!  I have downloaded this and will start testing whenever my job lets me have some free time LOL