Red oil pressure warning came on


Asked by Dec 01, 2015 at 12:02 AM about the 2005 Audi S4 quattro AWD Sedan

Question type: Maintenance & Repair

Red oil pressure warning came on. The status of how it is driving has not
changed. There is no knocking or pinging. I checked the oil, it was a little low
so i put a quart of full synthetic premium oil in. Problem still persists.

6 Answers


That light is on for a serious reason. Full quantity does not mean full oil pressure. For the sake of a $3,000 engine, have it towed to a shop or dealer. The sending unit may be faulty, giving a false low read. (Hopefully that's all) But that is a $10 part and the engine needs to be checked with a diagnostic computer, and I don't mean OBDII. But also, you say "a little low" and you added a full quart? Overfilling is just as bad as low, the crankshaft can dip in to the oil in the pan and whip it in to a a blender, causing no oil pressure

3 out of 3 people think this is helpful.
Best Answer

The oil is exactly the amount it should be after that quart. And i am aware that putting too much oil in can be harmful. I am a mechanic, i worked at Nissan for 3 years, but this is my first Audi, and in my opinion i dont know that much about it yet. Im letting her rest for the night. Although, If there were no oil pressure im sure i would know the difference in how she drives. Wouldnt u think?

1 out of 1 people think this is helpful.

With no tapping/knocking sound I do not think it would effect performance. But an Audi is not so exotic to be different than any car as far as that's concerned. I still lean to faulty sender. I did not mean to insult you as if you know nothing about this stuff... I have a bad habit of doing that.... going under the assumption that a question is from somebody that knows jack.

2 out of 2 people think this is helpful.

Im confused, r u calling me the sender, because i asked the question? I know plenty about cars, especially Nissans cuz i used to get paid o work on them. But like i said this is my first Audi. And really what im trying to ask is if this issue is something i can fix myself through trouble shooting a few things or should i immediately take it to my Audi guy?

1 out of 1 people think this is helpful.

No, no, I mean oil pressure sending unit. No way would I call you a faulty sender.. as a person. In the early 90's I had a Quattro that one day my (then) 6 year year old decided to fill her up... with the garden hose. The the wife pulled the hose out and proceeded to drive away. She got about one block and called me, bitching about 'her' car died. I don't know about the Audi's these days, but this was a 2.5L 5 cylinder that had a 'fuel distributor' that ran off camshaft, and produced something like 2500 psi (no typo, 2500) fuel pressure, it was set up to inject a such a moment to overcome compression and that little 5-banger would scoot. I think it was about 250 HP. Anyway, the car, after $1500 work, was never the same. Since you asked, my opinion is take it you your Audi guy. When I said they are not exotic... well maybe I jumped the gun. Audi's are fairly exotic and what you spend may well save you a lot more in the end game.

2 out of 2 people think this is helpful.

I went back and looked it up and it was a 2.2 with 210HP. Still pretty decent

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions


Looking for a Used S4 in your area?

CarGurus has 994 nationwide S4 listings starting at $3,700.


Search Audi S4 Questions

Audi S4 Experts

#1 Cynergyzed
Reputation 170
#2 Ryan Conde
Ryan Conde
Reputation 150
#3 bachmusic
Reputation 110
View All

Related Models For Sale

Used Audi A4
205 Great Deals out of 11,130 listings starting at $1,333
Used BMW 3 Series
1,113 Great Deals out of 35,574 listings starting at $900
Used BMW M3
61 Great Deals out of 1,935 listings starting at $4,999
Used Audi A6
123 Great Deals out of 6,826 listings starting at $950
Used Audi S3
8 Great Deals out of 571 listings starting at $26,500
Used Mercedes-Benz C-Class
574 Great Deals out of 30,886 listings starting at $1,500
Used BMW 5 Series
526 Great Deals out of 14,722 listings starting at $1,375
Used Ford Mustang
319 Great Deals out of 45,670 listings starting at $2,000
Used Dodge Charger
246 Great Deals out of 27,490 listings starting at $1,997
Used Mercedes-Benz E-Class
475 Great Deals out of 22,705 listings starting at $1,999

Used Cars For Sale

2018 Audi S4 For Sale
125 listings starting at $55,175
2016 Audi S4 For Sale
4 Great Deals out of 37 listings starting at $33,995
2015 Audi S4 For Sale
4 Great Deals out of 67 listings starting at $32,900
2014 Audi S4 For Sale
3 Great Deals out of 166 listings starting at $24,990
2013 Audi S4 For Sale
4 Great Deals out of 121 listings starting at $22,403