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#4641862 - 01/21/18 11:48 AM Intermittent oil pressure warning Audi A4
dlundblad Offline


Registered: 09/30/13
Posts: 10026
Loc: Indiana
Good Sunday afternoon BITOG.

2004 Audi A4. 3.0 V6. ~178k.
The oil pressure warning comes on intermittently. The oil level is correct. I am hoping it's either a faulty oil pressure sensor or faulty bypass in the filter, but research has lead me to believe the oil pickup screen may be plugged up with junk.

Long story short, it was purchased as a daily driver to keep the miles off a beloved vehicle, but an exhaust cam lob was gone and the engine ended up getting replaced with a junkyard engine back at ~120k. VW502 oil and German Mann filters have always been used since the transplant.
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03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4641868 - 01/21/18 11:54 AM Re: Intermittent oil pressure warning Audi A4 [Re: dlundblad]
rooflessVW Online   content


Registered: 12/24/11
Posts: 4041
Loc: North Carolina
Pop a sensor in it. They're $15 or so if I recall correctly.
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#4641871 - 01/21/18 11:55 AM Re: Intermittent oil pressure warning Audi A4 [Re: rooflessVW]
dlundblad Offline


Registered: 09/30/13
Posts: 10026
Loc: Indiana
Originally Posted By: rooflessVW
Pop a sensor in it. They're $15 or so if I recall correctly.



Yes sir.

Looks like it goes right above the oil filter housing.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4641974 - 01/21/18 02:07 PM Re: Intermittent oil pressure warning Audi A4 [Re: dlundblad]
VeryNoisyPoet Offline


Registered: 12/16/17
Posts: 290
Loc: Massachusetts
Is there any pattern to when the warning comes on? Such as less frequent when cold (higher oil viscosity and higher pressures), but more frequent when sitting in a roasting hot traffic jam, or flickering at idle after getting off a long highway run (oil at operating viscosity and thus lower pressures)?

Does blipping the throttle to raise the RPMs off idle make the warning stop?
_________________________
1998 V70 GLT / 187k miles

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#4642000 - 01/21/18 02:39 PM Re: Intermittent oil pressure warning Audi A4 [Re: dlundblad]
FowVay Offline


Registered: 06/02/02
Posts: 2679
Loc: Southeastern USA
If the problem isn't sensor related then you might have a worn oil pump drive chain. At the age and mileage I wouldn't be surprised.
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#4642050 - 01/21/18 03:37 PM Re: Intermittent oil pressure warning Audi A4 [Re: VeryNoisyPoet]
dlundblad Offline


Registered: 09/30/13
Posts: 10026
Loc: Indiana
Originally Posted By: VeryNoisyPoet
Is there any pattern to when the warning comes on? Such as less frequent when cold (higher oil viscosity and higher pressures), but more frequent when sitting in a roasting hot traffic jam, or flickering at idle after getting off a long highway run (oil at operating viscosity and thus lower pressures)?

Does blipping the throttle to raise the RPMs off idle make the warning stop?


From what I understand, it's when the car at full temperature and is shifting through gears during stop and go traffic. No issues on highway driving.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4642097 - 01/21/18 04:27 PM Re: Intermittent oil pressure warning Audi A4 [Re: dlundblad]
CT8 Online   content


Registered: 10/09/14
Posts: 10953
Loc: Idaho
At idle when the oil is hot?
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#4642108 - 01/21/18 04:41 PM Re: Intermittent oil pressure warning Audi A4 [Re: dlundblad]
das_peikko Offline


Registered: 01/01/18
Posts: 503
Loc: San Antonio, TX
Originally Posted By: dlundblad
From what I understand, it's when the car at full temperature and is shifting through gears during stop and go traffic. No issues on highway driving.


Since the oil level is sloshing back and forth inside the pan while driving in traffic; and since the oil level is steady on the highway; that leads me to suspect the oil level is too low and you have the wrong length dipstick.

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#4642152 - 01/21/18 05:35 PM Re: Intermittent oil pressure warning Audi A4 [Re: dlundblad]
incognito_2u Offline


Registered: 12/15/16
Posts: 113
Loc: Long Island, N.Y.
From past experience, Drop oil pan and clean sludge off oil pick-up screen........Audiís extended oil change intervals of the early 2000ís are to thank for that. laugh
This is coming from a previous owner of a 2003 A4,


Edited by incognito_2u (01/21/18 05:37 PM)
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2006 Jeep Commander 3.7 V6 -108k (PUP/XG3600)
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#4642246 - 01/21/18 06:49 PM Re: Intermittent oil pressure warning Audi A4 [Re: dlundblad]
dlundblad Offline


Registered: 09/30/13
Posts: 10026
Loc: Indiana
Looks like these don't use a fiber gasket and just use this stuff.
https://www.fcpeuro.com/products/audi-vw-oil-pan-sealing-compound-50ml-d176501a1

Would I be asking for trouble by using a Permatex equivalent?
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4642249 - 01/21/18 06:52 PM Re: Intermittent oil pressure warning Audi A4 [Re: das_peikko]
dlundblad Offline


Registered: 09/30/13
Posts: 10026
Loc: Indiana
Originally Posted By: das_peikko
Originally Posted By: dlundblad
From what I understand, it's when the car at full temperature and is shifting through gears during stop and go traffic. No issues on highway driving.


Since the oil level is sloshing back and forth inside the pan while driving in traffic; and since the oil level is steady on the highway; that leads me to suspect the oil level is too low and you have the wrong length dipstick.


Good observation, but it's had this dipstick for the last 60k miles.

I will say it is hard to read since it's black plastic, but I've confirmed the level many times after a fresh 7 quart oil change as well.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4642669 - 01/22/18 09:06 AM Re: Intermittent oil pressure warning Audi A4 [Re: dlundblad]
VeryNoisyPoet Offline


Registered: 12/16/17
Posts: 290
Loc: Massachusetts
Quote:
From what I understand, it's when the car at full temperature and is shifting through gears during stop and go traffic. No issues on highway driving.

So, on acceleration or deceleration, but not at idle?
What about immediately after exiting the highway and coming to a stop at idle?


Quote:
Would I be asking for trouble by using a Permatex equivalent?

Permatex Ultra Black is very similar, but I would recommend going for the OEM specified material just to be safe, unless someone else here has good experience with a substitute.
_________________________
1998 V70 GLT / 187k miles

"Use yah blinkah!"

"Be nice. The alternative involves an air horn and 7000 lumens of high beam."

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#4642688 - 01/22/18 09:20 AM Re: Intermittent oil pressure warning Audi A4 [Re: dlundblad]
jeepman3071 Offline


Registered: 04/15/10
Posts: 4216
Loc: Storrs, Connecticut
Might be worth pulling the fill cap to see what the engine looks like inside. A co-worker's A4 had the same issue with a 1.8T engine, and it ended up being pretty sludged inside from PO neglect. The oil light would flicker at hot idle, and putting a gauge on it revealed the engine only had a couple PSI at idle. It scorched the turbo soon after and he sold the car.
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2000 Jeep Cherokee 4.0L (179k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (32k) - Castrol Edge Euro 0w40, MANN HU816X

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#4647863 - 01/27/18 10:09 AM Re: Intermittent oil pressure warning Audi A4 [Re: dlundblad]
dlundblad Offline


Registered: 09/30/13
Posts: 10026
Loc: Indiana
The oil pressure wire is frayed. Not too bad, but wire is exposed.

I couldn't get to the oil pressure sensor so I gave up and removed the pan. Took 15 mins if that.. The engine was spotless. I also removed the oil pump chain cover. The chain was tight and once again, everything was spotless. I fiddled with the sensor connector for about 30 mins, sacrificed one of my picks to shorten it up since room was tight.. there was no way. Finally gave my Autozone clearance Dorman electrical connector disconnect tool a try and it came off with the first attempt.

I used the hook shaped tool.
https://www.summitracing.com/parts/rnb-8...BSABEgKMpPD_BwE
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4647867 - 01/27/18 10:14 AM Re: Intermittent oil pressure warning Audi A4 [Re: dlundblad]
dlundblad Offline


Registered: 09/30/13
Posts: 10026
Loc: Indiana

That wire is at a bit of a harsh angle and it was pretty tight. The disconnect tab was also perfectly aligned with that bump in the engine block, which made seeing and getting to it that much harder.




Edited by dlundblad (01/27/18 10:16 AM)
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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