Intermittent CEL, P0026 - Subaru Outback - Subaru Outback Forums
 
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post #1 of 9 (permalink) Old 02-25-2013, 08:12 AM Thread Starter
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Intermittent CEL, P0026

Hey guys! My '05 Outback Sedan 3.0R keeps throwing a P0026 code (Intake valve control solenoid circuit range/performance bank 1)for, what seems like, no reason at all. The oil level is where is should be, there doesn't look like there are any oil leaks, and the sensors are all properly connected. Any suggestions on how to fix this? It's driving me nuts. Thanks.


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post #2 of 9 (permalink) Old 02-25-2013, 11:47 AM
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It may be a bad or leaking pressure switch. Number 5 in the pic.

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post #3 of 9 (permalink) Old 02-25-2013, 04:45 PM Thread Starter
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Thanks. Is there anything special to removing the pressure switch?

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post #4 of 9 (permalink) Old 02-25-2013, 09:34 PM
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No. Take the air filter box out of the way, unplug it, remove, replace.
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post #5 of 9 (permalink) Old 02-26-2013, 07:03 AM
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Incendio:

Further to cardoc's suggestions, check around the pressure switch for visible oil leakage, especially at the joint between the metal base and the plastic upper part, and at the connector at the top.

Also, if you have a digital multi-meter, could you check the resistance of the switch between the terminal at the top and the metal base/engine block when the engine is off? I suspect that sometimes the codes (P0026 and P0028) experienced with the variable valve lift mechanisms might be related to deterioration of the contacts inside the switches but need data to confirm. See my thread: Variable Valve Lift oil pressure switch resistance
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post #6 of 9 (permalink) Old 02-26-2013, 10:54 AM Thread Starter
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Quote:
Originally Posted by plain OM View Post
Incendio:

Further to cardoc's suggestions, check around the pressure switch for visible oil leakage, especially at the joint between the metal base and the plastic upper part, and at the connector at the top.

Also, if you have a digital multi-meter, could you check the resistance of the switch between the terminal at the top and the metal base/engine block when the engine is off? I suspect that sometimes the codes (P0026 and P0028) experienced with the variable valve lift mechanisms might be related to deterioration of the contacts inside the switches but need data to confirm. See my thread: Variable Valve Lift oil pressure switch resistance
I posted this in your thread, but the multimeter reading was 29.8.

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post #7 of 9 (permalink) Old 03-03-2013, 01:36 PM
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30 Ohms is a lot higher than the 10 Ohms I observed. (Thanks for reporting in the other thread.)

Did you identify where the leak is coming from, and if the switch was replaced, did that resolve the problem?
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post #8 of 9 (permalink) Old 12-12-2015, 03:58 PM
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How to troubleshoot if the oil pressure switch next to the variable valve lift solenoid is causing the P0026 Code.
P0026 REFERS TO THE PASSENGER SIDE PRESSURE SWITCH OR VVL SOLENOID.
P0028 REFERS TO THE DRIVER SIDE PRESSURE SWITCH OR VVL SOLENOID.
I had a problem with the passenger side and here is my instructional on how I was able to fix my problem code in my 2010 2.5i manual Outback. I hope this helps any of you out with either of these codes.
(Test resistance with the car turned off and keys out between terminal and base of switch).
Once you test the switch, which is a normally closed switch, for resistance you should be able to tell if it went bad or not. I tested the driver side resistance versus the passenger side resistance. The passenger side resistance was double versus the driver side when testing it on the engine before removal. A new pressure switch resistance was 1.7 ohms. The old bad pressure switch resistance when removed was 24.4 ohms (the high resistance means that the NORMALLY OPEN switch was stuck in an OPEN position. Also, the resistance will vary on a bad pressure switch).
Once I replaced the switch, I disconnected the negative battery terminal for 5 minutes to clear the codes and reset the computer.

AS A SIDE NOTE - IF the code came back, it would mean that this pressure switch was not the only culprit, I would then purchase the Variable Valve Lift Solenoid and replace it as well. The solenoid can throw this code if it goes bad or gets clogged.
CHECK YOUR ENGINE OIL, a low oil condition can cause this code to appear as well. search for and watch a youtube video ------->>> 2010 Subaru 2.5 Variable Valve Lift Solenoid and Switch Testing
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post #9 of 9 (permalink) Old 08-13-2016, 11:50 PM
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Code came back. You wouldn't believe what the **** causes this intermittent code!!!

A clogged pcv valve will throw this code under idle. At highway speeds it was fine but more and more it started to feel like the engine would want to stall under deceleration causing the cel to turn on and throw the p0026 code. By chance i checked the pcv valve due to friends recommendation. It was slightly clogged and not sealing properly. My car has 123k miles and valve is original. Instead of replacing the pcv valve, i sprayed carburator cleaner into it a few times and let it soak. Then replaced all hoses and clamps. Cleared the code. Started the car and 1000 miles now. Code is gone and no more!!!!!!!!!! What a god damned relief. This is such bullsh.t i had taken my car to the dealership paid $600 to have it properly diagnosed and they should know that a vacuum leak through a pcv valve can cause this issue. Yet it is not in any of the dealership service manuals. Hope this helps you boys with intermittent p0026 and p0028 cel issues under low engine speeds and idle.
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