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2005 Outback 3.0R Sedan
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Discussion Starter #1
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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2005 Outback 3.0R Sedan
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Discussion Starter #3
Thanks. Is there anything special to removing the pressure switch?
 

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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: http://www.subaruoutback.org/forums...e-switch-resistance.html?highlight=resistance
 

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2005 Outback 3.0R Sedan
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Discussion Starter #6
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: http://www.subaruoutback.org/forums...e-switch-resistance.html?highlight=resistance
I posted this in your thread, but the multimeter reading was 29.8.
 

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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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2010 Outback 2.5i Premium 6MT 87Kmi
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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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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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2001 Outback Wagon, 2005 Outback 3.0 (not running),2015 Forester
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Thanks

Just read your thread. I am having a similar issue. My resistance is low 8 ohm and the code only comes on once in a while when letting off the gas. I am hoping to clean up the PCV body and see if that works.

Thanks,
 

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2008 Outback 2.5i, 2009 Forrester 2.5 sohc
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I had the P0028 code in December, the sister code for the other bank. Both my pressure sensors read the same resistance , so I changed the solenoid with an OEM unit. The code hasnt returned. About $100 from the dealer with a discount. I bought a pressure switch, but did not install it. the valve change repaired my problem.

The left valve is a PITA to remove. Your lucky if you have to do the right side. Right side is very accessible.
 

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2001 Legacy L Sedan, 2009 Impreza Sedan, 2013 Crosstrek, 2016 WRX
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149 Posts
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
For this test do you have your multimeter on the 200 Ohm setting and not the 200K setting? Also, when you touch the probes together at 200 Ohms does the resistance show a perfect 0? My cheap meter shows a 2.X so it may be time I get something nicer.
 

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2010 Outback 2.5i Premium 6MT 87Kmi
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For this test do you have your multimeter on the 200 Ohm setting and not the 200K setting? Also, when you touch the probes together at 200 Ohms does the resistance show a perfect 0? My cheap meter shows a 2.X so it may be time I get something nicer.
For this test do you have your multimeter on the 200 Ohm setting and not the 200K setting? Also, when you touch the probes together at 200 Ohms does the resistance show a perfect 0? My cheap meter shows a 2.X so it may be time I get something nicer.
I posted updated information on this issue. After doing this repair the code comes back. It turns out this code is thrown because of a partially clogged PCV valve that doesn't close all the way and vacuum pressure is not maintained. Easiest thing to do that I did was clean the PCV valve by spraying some brake parts cleaner to loosen the debris and clean the ball inside without taking it off the engine. Then reconnect the hoses and clamps. Once I did that, it has been what a year or two years and the code hasn't come back since.
You can find my previous post on this. search by code and PCV.
IT PISSED ME OFF THAT THIS FIX IS NOT MENTIONED ANYWHERE AT SUBARU REPAIR MANUALS AND HAD TO FIGURE OUT ON MY OWN BASED ON TALKING WITH A MECHANIC.
Hope this helps.
 

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2001 Legacy L Sedan, 2009 Impreza Sedan, 2013 Crosstrek, 2016 WRX
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I posted updated information on this issue. After doing this repair the code comes back. It turns out this code is thrown because of a partially clogged PCV valve that doesn't close all the way and vacuum pressure is not maintained. Easiest thing to do that I did was clean the PCV valve by spraying some brake parts cleaner to loosen the debris and clean the ball inside without taking it off the engine. Then reconnect the hoses and clamps. Once I did that, it has been what a year or two years and the code hasn't come back since.
You can find my previous post on this. search by code and PCV.
IT PISSED ME OFF THAT THIS FIX IS NOT MENTIONED ANYWHERE AT SUBARU REPAIR MANUALS AND HAD TO FIGURE OUT ON MY OWN BASED ON TALKING WITH A MECHANIC.
Hope this helps.
Sure I will look at my PCV if the code returns. Any answers to my multimeter questions though?
 

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2010 Outback 2.5i Premium 6MT 87Kmi
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I posted updated information on this issue. After doing this repair the code comes back. It turns out this code is thrown because of a partially clogged PCV valve that doesn't close all the way and vacuum pressure is not maintained. Easiest thing to do that I did was clean the PCV valve by spraying some brake parts cleaner to loosen the debris and clean the ball inside without taking it off the engine. Then reconnect the hoses and clamps. Once I did that, it has been what a year or two years and the code hasn't come back since.
You can find my previous post on this. search by code and PCV.
IT PISSED ME OFF THAT THIS FIX IS NOT MENTIONED ANYWHERE AT SUBARU REPAIR MANUALS AND HAD TO FIGURE OUT ON MY OWN BASED ON TALKING WITH A MECHANIC.
Hope this helps.
yes when you touch the probes together you read "0" because there are zero ohms of resistance. when you hold the probes apart it reads "OL" for open loop because it reads infinite resistance or out of range. 20Kohms is huge amount of resistance.
 

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I deal with digital multimeters every day. It's good practice to measure the resistance in the test leads before taking a resistance measurement. For example if touching the leads together results in a reading of 2.5 ohms subtract that reading from the results of measuring your component to obtain the most accurate results
 
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