So I am experiencing a leak that is really challenging me, I believe it is coming from #5 on the attached drawing. I am hoping one of you can first tell me what this sensor is? And secondly can or if this sensor is faulty can it cause an oil leak?
I appreciate your experience and knowledge in advance.
jesaire55

 

well, if its the oil pressure sensor, sure it can leak if the seal is bad. What year/engine is your car? I'd use a dealer web store to see if there's a part number for the seal and if its diagram matches what you've attached.

 

Hi MT6127,
my car is a 2015 xc60 T5 4 cyl turbo. So I found the diagram on a web dealer website but they do not list the the item. My engine model is B4204T11. I appreciate any help you can contribute.

jesaire55

 

there's two different parts to check out - one is the oil pressure switch aka sending unit that feeds the warning light #3545696 and #31405635. Take a look on the dealer's store to see what the device looks like and then see if that looks like what's leaking. Either case the part is cheap ($25) and you can get it replaced easily.

 

The sensor marked #5 looks more like a knock sensor than anything else. Knock sensor is about the only sensor that I know of that runs a hold down bolt through the middle of the sensor.

 

Good point in that it may not be the true source of the leak. As a next step, use some engine degreaser to clean around where you see the leak to help determine the actual source. If it appears to be something bolted on, you can check the seal and see if the part itself shows some damage (ie cracks etc).

 

Hi all, so with my wife keeping the rpm’s at 3k I was able to see a smudge of oil coming out of the intake hose going into throttle body.
Disconnected one of the intercooler hoses from the turbo and guess what I found? You guessed it, turbo seal is leaking.
anyways I am now looking for a rebuild kit for my turbo, need to lean on you experts to help me locate..(please) I will attached the turbo I’d tag.
many thanks
jesaire

 

Are you sure its the turbo seals and not an issue with the PCV's oil separator? Turbo seal failures are pretty rare at low mileage while PCV systems require regular maintenance. I'd probably check out the PCV system first and then get a professional diagnosis before pulling the turbo out.

 

Hi MT6127,
so when I took out the turbo there was notable play on the turbines -( not rubbing) also oil was on the secondary side… anyways I am very interested in your comment. Are you referring to the pcv check valve or does Volvo have an entire assembly.many thanks
jesaire55

 

Never worked on a 2015 Volvo but I suspect its similar to my VW CC where the oil separator bolts onto the top of the head. for the VW, I popped off the vanity cover, removed a couple of the coils, undid a bunch of torx screws and hose clips. Once the box is off you should see a spring actuated valve. that should move freely and not be clogged with any gunk. There's also a vaccuum diaphram in there which if that tears, will allow oil to suck into the intake. Cost of a replacemnent is in the $150-200 range but should only require an hour or so of shop time. You can inspect to see if any oil is getting into the intake. PS - quite often a failed oil separator will set off a fault code for fuel trim or lean idle as it can create an intake air leak.