1998 V70 P0413 SAS Valve A open diagnosing

[dynamaniac]

I can't believe it's November and I'm dealing with this again. I replaced the SAS valve about 6 weeks ago and then took a LOT of driving to try to reset the sensors (I think 1500 miles? And that was after attempting to do two of the suggested RPM/MPH ramping patterns). Lo and behold, today the CEL and P0413 code was triggered again. (Also my OBD II reader still says that 6 of the sensors are incomplete... sigh).

When I installed the new SAS valve, the hydraulic tube and the air tube both seemed fine, so I reused them. How might I diagnose the problem at this point?

[Richard99]

Generally with these types of codes I like to take a shotgun approach and replace a lot of items as you'll likely just be replacing pumps, valves, and tubing again after replacing what was broken. The items that usually create these codes are as follows:

1) Faulty air pump due to water intrusion through faulty air pump check valve
2) Faulty air pump check valve
3) Faulty EVAP purge valve (easy to test with 9V battery)
4) Faulty SAS valve (also easy to test with 9V battery)
5) Cracked tubing connecting to the EVAP purge valve and around the intake manifold.

If you check or replace all of the items in a systematic fashion, you should not have any problems with the P04XX codes for a long time.

Eric

[Richard99]

What are the hydraulic and air tube? Where did you obtain your replacement SAS valve?

[dynamaniac]

Thanks for your response Eric. I should've said vacuum line and air pump hose, which I will replace in the next day or so. The new SAS valve is MTC (aftermarket), obtained from IPDUSA. I'll test the EVAP purge valve and might as well test the new SAS valve just in case. The pump isn't dead, so I'm hopeful the P0413 is directly connected to the SAS valve and not one degree up or downstream, if you will.

[erikv11]

..

2) Faulty air pump check valve

...

This one caught my eye - there isn't actually a separate air pump check valve I think? Not recalling that, my cars have all been through SAS delete.

[Richard99]

..

2) Faulty air pump check valve

...

This one caught my eye - there isn't actually a separate air pump check valve I think? Not recalling that, my cars have all been through SAS delete.

There absolutely is a separate air pump check valve. Hovers right above the exhaust manifold. When they go bad, they will let water in through th tubing and destroy the air pump. That's how most of them go. Here is a link to the part:

https://www.fcpeuro.com/products/volvo- ... -9125623-1

Eric

[erikv11]

..

2) Faulty air pump check valve

...

This one caught my eye - there isn't actually a separate air pump check valve I think? Not recalling that, my cars have all been through SAS delete.

There absolutely is a separate air pump check valve. Hovers right above the exhaust manifold. When they go bad, they will let water in through th tubing and destroy the air pump. That's how most of them go. Here is a link to the part:

https://www.fcpeuro.com/products/volvo- ... -9125623-1

Eric

That's the SAS valve.

Sorting through your posts it sounds like you may be confusing the solenoid (on the fan shroud) with the SAS valve (on the exhaust manifold). SAS valve is by far and away the major problem with the system. The solenoid rarely fails, it'a a good one to go junkyard part on if you need one or for troubleshooting.