[plain OM]

You've identified the VVL solenoids correctly (1st photo, sloped, with the blue connector). Each solenoid is paired with a pressure sensor -- the vertical part with the white connector. The bank 1 solenoid is the one the passenger side at the rear.

Even though the CEL has gone out (after three drive cycles), the code might still be stored in the memory.

The linked threads, unfortunately, don't seem to provide a clear conclusion whether or not the code is related to the reflash. There are few reports of post-reflash impacts.

 

[plain OM]

I haven't identified a definite connection between re-flashing and the appearance of the VVL control codes (P0026, P0028) shortly thereafter. However, the new software might have more stringent requirements for the pressure sensors (switch). If the resistance of the sensor contacts is too high, the ECM will interpret this as an "open" sensor when it should be closed. I believe this is a common cause of the two codes -- deterioration of the sensor internal contacts.

See this thread: http://www.subaruoutback.org/forums...blems-maintenance/49468-variable-valve-lift-oil-pressure-switch-resistance.html

If you have a digital multimeter that reads Ohms (resistance), measure the resistance between the pressure sensor contact and ground. It might be too high. This can also be an intermittent situation, with the resistance sometimes being too high.

To get a better idea of what might be happening inside a typical pressure sensor switch, see: http://www.subaruoutback.org/forums...forums/66-problems-maintenance/35622-oil-pressure-sensor-switch-how-clicks.html

 

[plain OM]

I may dig into it this weekend.

Might want to search the forums here for the two related codes P0026 and P0028.

 

[plain OM]

I presume that the problem with the codes and misfires appeared after the oil change.

Does the car have an automatic or manual transmission?

If automatic, check the level of the gear oil in the front differential. (It has its own dipstick.) That holds about 1 quart . . .

The differential might have been drained, and then oil added to the engine.

Also, was the oil filter changed?

There's a fair number of posts here related to the P0026 and P0028 codes. (Search for the codes for additional reading.) Although not confirmed, in one case it appears that the code might have been caused by an improper or defective oil filter.

 

[plain OM]

amntomek:

Nice write up and photos related to the 2010+.

I've been "collecting" stats on the switches for some time, and as you note, 20 Ohms or so seems to be the point where the ECM interprets the high resistance as an "open" at the switch when it should be closed. (See http://www.subaruoutback.org/forums...blems-maintenance/49468-variable-valve-lift-oil-pressure-switch-resistance.html)