We have just fitted 22641AA042 Front AFR Sensor into a P.WRX WRP10. The vehicle came in with the engine light on which indicated Front O2 AFR sensor.

I will be detailing pics of the install for those of you who want an insight into the installation process.

Pics of part to be installed:



1) Unplug the sensor harness. Plug is located on the driver's side of the engine bay close to the factory boost solenoid.


2) Remove the factory air ducting. This is held by 2 size10 bolts.



3) Unclip the factory harness from the metal support. This is located beside the driver's side coilpacks.


4) Jack the car up or use a hoist if you have access to one(makes life a lot easier, but in this illustration, I had the WRP10 jacked up on stands).

5) Remove the under cowl. There are 2 size12 bolts on the rear, 3 size12 bolts on the front and 2 corner plastic clips.
Front bolts are located in the circular indentation. There are 3 of them:

Rear bolts are located at the back middle section. --- Dont forget the 2 plastic clips: