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06 3.2 XC90 Codes P0087, P0172 and P0175

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Old Mar 18th, 2019, 15:31   #1
jamesholley
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Default 06 3.2 XC90 Codes P0087, P0172 and P0175

Hello all

I need some assistance in working out what could be causing these codes to be thrown up.

I first saw them on Christmas Eve, no issues felt with the engine.

But my code reader confirmed

p0087 fuel rail/system pressure
p0175 system too rich bank 2
p0172 system too rich bank 1

I cleared the codes down, but four weeks later the CEL has come back on and I suspect that the issue has re-occurred.

The engine is seeming to make a two tone noise when I drive it, but it doesn't feel sluggish and appears still responsive.

Any help or suggestions on what to check would be greatly appreciated.

I have just moved house at great expense, so would prefer not to have a trip to the local garage.

Thanks




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Old Mar 18th, 2019, 15:35   #2
SwissXC90
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Look carefully at the intake system for air leaks, especially from Turbo to the intercooler

Split pipe, cracks, failed seals, etc.
May also be a leaking intercooler.

Any leaks past the MAF result in too rich a mixture due to too much unmetered air.

if you have a split pipe or a crack, you can make a temporary repair with some duct tape.... but make sure you replace any broken part you find.
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Old Apr 4th, 2019, 10:20   #3
jamesholley
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Hi all

I have been back from the local garage and they diagnosed a faulty fuel pressure sensor.

So they removed and cleaned the fuel rail and replaced the pressure sensor.

They handed the car back as fixed and so far so good, the CEL has not come back on in two days.

However, the engine in low revs still sounds like it is chugging. So for me, in my mind, I don't see a change.

I don't ever recall the engine sounding o rough. I suppose i am putting this issue in with the CEL codes, or it could just be a separate issue.

Any thoughts other than going back to the garage and spending more money?

Thanks



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Old Apr 4th, 2019, 13:23   #4
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It might be worth checking the oxygen (O2) sensors if its running rich as indicated this will potentially choke the fuelling making it chug at low revs, but fly on full throttle.
As with all things Volvo, buying good branded or O/E is far better in the long run.
(my old MR2 used to eat O2 sensors and the cheap ones wouldn't last a week)
Sometimes you can clean up the old ones, take them out carefully as they don't like to be knocked about and spray them with carb or brake cleaner and when dried out refit with a little copper grease.
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Old Apr 5th, 2019, 11:35   #5
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Thanks, I have a code reader so will see what it records for the o2 sensor.

I will do some homework on how easy it is to access and clean up.
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Old May 20th, 2019, 09:55   #6
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Well I have tried to shift the one reasonably accessible o2 sensor on the car (3.2 petrol) and it is not budging.

I used a WD40 Penetrating spray, 2 or 3 times over the weekend and had a couple of different o2 sensor tools connected to a 15 cm socket and then a longer torque wrench....NO GO.

I have a breaker bar coming today in the post, which might improve the leverage a bit, but are there any other tips that you all may have to get the f*cker loose?
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Old May 20th, 2019, 10:16   #7
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Heat.

You need a torch or propane burner.
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Old Jun 10th, 2019, 14:58   #8
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OK, so I was unable to remove the o2 sensors, either with heat or many dressings with lubrication.

So I booked it into a Volvo Specialist in Basingstoke (Ktek Automotive) and had them basically check the engine over and do some diagnostics to see if my theory that it was running rich was correct.

Annoyingly, even with a test drive on the road, they could not seem to hear the annoying chug that I hear when de-accelerating, or here any other engine noise that sounds odd.

The diagnostics came back clean and they gave the engine a clean bill of health. The only comment about a noise came when it was on their rolling road and they thought there might be a transmission related noise.

Essentially, the car has 131k on the clock, has never towed anything and has not had any transmission oil changes. The gear changes still feel ok to me, no warning lights at all of as far as I can tell gear performance issues.

What are peoples opinions on maybe getting a transmission change give the miles done and in the hope that it might eradicate the car of this ghastly noise?

The noise is definitely when I have taken my foot off the accelerator and I am coming to a stop.
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Old Jun 10th, 2019, 17:21   #9
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Quote:
What are peoples opinions on maybe getting a transmission change give the miles done and in the hope that it might eradicate the car of this ghastly noise?
Crazy, expensive, risky idea!
Diagnose, then replace parts if required.
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Old Jun 10th, 2019, 18:31   #10
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You mean transmission change or transmission oil change?

For the oil change, I know there are very different opinions about... IMHO do it. I did transmission oil changes on a few cars (two were mine), never had any problems. All were running better afterwards, but I always did a flush, not only a change.

If you really mean transmission change, why would you do that? As long as it runs without errors, don't waste money and time.
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