Where is the PCV Valve located?

BEJOE95

MEMBER
2003 MERCURY SABLE
3.0L
6 CYL
2WD
AUTOMATIC
142,000 MILES

My CEL came on, so I took it to AutoZone to have it scanned, it came back with codes P0174 and P0171 and a suggested fix for replacing the PCV valve. I have no idea where to even begin looking for this thing, and Google isn't helping so now I come here. I am not mechanically inclined in the slightest, so any assistance would be greatly appreciated!

Edit to add: This is the 24 valve DOHC engine, according to the plate dealy on the engine.

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,380 POSTS

Here is information on the codes:

P0174 - System Too Lean (Bank 2):

P0171 - System Too Lean (Bank 1):

This guide can help as well:

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

Here is the location of the PCV valve. Check out the images (below). Please let us know what happens.

Image (Click to make bigger)

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Saturday, June 3rd, 2023 AT 11:09 AM

BEJOE95

MEMBER
2 POSTS

Thanks for the response, Ken! I went and had a look under the hood, and it seems the hoses indicated in the picture you provided are just vacuum lines. At least the one in the front is, I don't know about the one in the back because I would have to dismantle a big something-or-another in the way.

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Sunday, June 4th, 2023 AT 10:55 AM

KEN L