PO522 oil pressure sensor/switch low voltage code

jeepdaddy65 · **Posted:** Sun Nov 09, 2008 1:19 am

PO522 oil pressure sensor/switch low voltage code

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I have a 05 Liberty with a 3.7L. On the first start up of the day my oil light comes on and stays on and it throws this PO522 code. If I shut it down and restart it right away the light goes right out, and doesn't happen anymore until it sits awhile or overnight. I don't know if its the oil pressure sending unit or an electrical problem. The oil level is good no valve train noise. Seems to only happen in cold weather and when it sits for a while, just was wondering if this is a common problem. The sensor/sending unit looks to be an easy and cheap fix. Just kinda tossing this out there for other opinions. Thanks in advance for the help

tommudd · **Posted:** Sun Nov 09, 2008 9:52 am

I would go ahead and install a new switch, more than likely that is what it is, but if nothing else you will eliminate that from the list.
Also what kind of oil filter are you using?
Did it start right after the last oil change?
What weight oil are you running?

Tom

jeepdaddy65 · **Posted:** Sun Nov 09, 2008 5:43 pm

Thanks for the reply. It just started doing it as the weather got cold. I use castrol 5w-30 and a fram tough gaurd oil filter. I am about due for a oil and filter change, I am going to switch to Mobil 1 Synthetic, and also change the switch, since that only cost about $19.00. Funny thing is it only does it usually on the first start up of the day. If I shut the engine right back off the oil light goes out, engine runs smooth no valvetrain noise, oil is clean and up to level. Maybe weather related as we had temps in the 60's and 70's here in Ohio last week and it didn't do it at all until the weather got colder. and as I said it does it just once, after it's been sitting for hours . Thanks for the help

Jeepjeepster · **Posted:** Sun Nov 09, 2008 11:38 pm

Never use Fram filters. They are known to destroy engines.

Use a good quality filter, such as the Pureone purolater.

tommudd · **Posted:** Mon Nov 10, 2008 8:00 am

jeepdaddy65 wrote:

Thanks for the reply. It just started doing it as the weather got cold. I use castrol 5w-30 and a fram tough gaurd oil filter. I am about due for a oil and filter change, I am going to switch to Mobil 1 Synthetic, and also change the switch, since that only cost about $19.00. Funny thing is it only does it usually on the first start up of the day. If I shut the engine right back off the oil light goes out, engine runs smooth no valvetrain noise, oil is clean and up to level. Maybe weather related as we had temps in the 60's and 70's here in Ohio last week and it didn't do it at all until the weather got colder. and as I said it does it just once, after it's been sitting for hours . Thanks for the help

Yes it was nice for a few days there last week. I was stuck down in Columbus at a Housing Conference all week at the Convention Center

only thing I could do was look outside and think I need to be home. :lol:

grnd93 · **Posted:** Fri Dec 05, 2008 11:03 pm

Jeepjeepster wrote:

Never use Fram filters. They are known to destroy engines.

Use a good quality filter, such as the Pureone purolater.

I've always used Fram, never had a problem.

Would like to hear an example of how a filter destroyed an engine.

sleeve84028 · **Posted:** Sat Dec 06, 2008 9:43 am

Fram filters have a cardboard pressure cap in the bottom of the filter.

I know of 1 engine that has been destroyed because that cardboard collapsed and shut off the oil flow back into the engine of a vehicle.

Stick with high quality filters and read up... Link 1 Link 2 and my favorite Link 3

snowsport · **Joined:** Tue Oct 18, 2005 11:52 pm **Posts:** 1211

sleeve84028 wrote:

Fram filters have a cardboard pressure cap in the bottom of the filter.

I know of 1 engine that has been destroyed because that cardboard collapsed and shut off the oil flow back into the engine of a vehicle.

Stick with high quality filters and read up... Link 1 Link 2 and my favorite Link 3

Thanks for posting those, they're a good read. I've done some other reading about filters and the conclusions were similar. Surprising thing is, the difference between a really good oil filter and a poor, engine-threatening one is just a few $$.

grnd93 · **Posted:** Sat Dec 06, 2008 6:38 pm

sleeve84028 wrote:

Fram filters have a cardboard pressure cap in the bottom of the filter.

I know of 1 engine that has been destroyed because that cardboard collapsed and shut off the oil flow back into the engine of a vehicle.

Stick with high quality filters and read up... Link 1 Link 2 and my favorite Link 3

Quote:

Fram engineers perform hot oil circulation tests on the filter element and also regularly cut open used filters to examine how well they have withstood the rigors of actual use on a vehicle. For over 38 years, Fram end disks have stood up to hot oil and their adhesives have sealed off the dirty oil.

I seriously doubt that Fram could have remained in the business for 38 years if their filters are "known for destroying engines".

sleeve84028 · **Posted:** Sun Dec 07, 2008 1:11 am

I've stated the facts.

Fram makes cheap filters

But hey, it's your money and your choice so....

Canlibjeep · **Posted:** Mon Dec 15, 2008 12:43 pm

My KJ started doing the same thing (oil light comes on sometimes after sitting. Turn engine off then back on, it goes out) once it started getting cold outside. I was wondering if changing the sensor, solved your problem?

PO522 oil pressure sensor/switch low voltage code

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