2004 Audi A4 Quattro Oil Sensor Light
08-19-201409:twoscore AM #1
Established Member Ii Rings 
Oil Sensor Lite
Okay, about 7 years ago I had the oil calorie-free come on in my B5 A4 ane.8t. The mechanic said information technology was a sensor, replaced it twice, then my engine blew upwards on the freeway. I knew nothing near cars and had them fix the damage which was THOUSANDS!
Fas forward to now, I have learned a lot and now do all my own work on my cars. In my current B6 A4 ane.8t Quattro I e'er run Castrol Syntec 5w40 and take never had sludge issues.
Last month I was on a road trip in the centre of nowhere in Washington state, when apparently I sprung a leak and my oil low-cal came on. I stopped at the nearest gas station which was fortunately less than a mile, and was the but one in like 20 miles. They had no synthetic, and only carried Pennzoil. Then I put 5w40 in and hoped for the best.
A while down the road I got the oil indicator with the word "Sensor" on my dash. The oil was at the correct level, only out of paranoia considering what happened to my B5, I stopped driving and did seafoam that nighttime and put fresh Mobil 1 Total Synthetic 0w40 in.
Long story short, the oil/sensor light keeps coming on the nuance, like every ii-3 min. Should I try the sensor first, thinking information technology could be screwed up by the Pennzoil? Or should I drop the pan and clean everything?
Besides, shouldn't at that place be no more seafoam smoke coming out subsequently I changed the oil?
I'm feeling like I killed my engine.
08-19-2014xi:04 AM #three
Veteran Member Iv Rings 
Bailor LIVES!!
Pretty shut to 100% odds on information technology being the sensor. HOWEVER!! It is possible for the cluster to go bad and give the aforementioned mistake. I'yard probably the only i in the world who's had the oil sensor processor in the cluster go bad. And don't sweat the synthetic vs. regular oil affair. It's oil. Synthetic is better. Premium gas is also ameliorate. But would you run out of gas and tow your car if all you had to fill up it was regular gas?
No.
You didn't injure anything. And that seafoam can take many miles to fully run through. It could smoke (some / more usual) for some time.
Stop by next time you're Nowhere!
foley803 : What does an electric surge sound like? Barking dogs? Watermelons?
08-nineteen-2014eleven:39 AM #four
Veteran Member 4 Rings 
Originally Posted by rollerton 
Bailor LIVES!!
Pretty close to 100% odds on it being the sensor. HOWEVER!! It is possible for the cluster to become bad and give the aforementioned error. I'm probably the only one in the earth who's had the oil sensor processor in the cluster go bad. And don't sweat the synthetic vs. regular oil matter. It'due south oil. Synthetic is meliorate. Premium gas is also ameliorate. But would you run out of gas and tow your car if all you had to fill it was regular gas?
No.
You lot didn't hurt anything. And that seafoam tin can take many miles to fully run through. It could smoke (some / more usual) for some fourth dimension.
End by next time you're Nowhere!
Hey expect another Washingtonian, HIIII
Anywho basically what he said. I tend to cheque sensors first out of pure habit. Go the error, test the sensor, if reading is bad or questionable, supercede sensor, start car, mistake comes dorsum, search for real problem.
Do you have a friend with a B6? I would endeavor swapping the sensor to see if the error clears. If information technology does y'all know the problem.
Oscar "The Grouch": Is at present dead thanks to a boozer driver RIP
08-19-201412:28 PM #5
Veteran Member Three Rings 
buy audi sensor, not meyle, not hella, no annihilation, i spent so much money on this stupid thing. just get to the dealer, requite the parts guy your vin# and your cc.
/end
08-xix-201412:33 PM #6
Veteran Member Four Rings 
"Beep beeeep bloop boop" - R2 D2
08-19-201412:xl PM #vii
Veteran Member Three Rings
Originally Posted by WiLl2FLY
Hella is OEM
hella from euro parts place crapped out, went to dealer, bought a vw/hella ane, identical and didnt crap out.
lesson learned, get the stupid dealer white with circles box instead of the yellow hella one.
08-19-201412:45 PM #8
Established Fellow member Ii Rings
Haha.. I will stop past. Really I'll be a Washintonian myself pretty soon. Thank you for the encouragement. The smoke had me worried, I've washed body of water foam before simply never noticed it lingering much after an oil change. I ordered a sensor through the dealer. I checked around and could only detect them for $80-$90. The dealer was just $15 more so I decided to just be safety and go with that. After I ordered the sensor I noticed i of the wires peel is worn through. That could be part of the consequence. It will all get fixed up tomorrow and hopefully that lite turns off on my nuance. (Fingers Crossed)
08-19-201412:54 PM #9
Veteran Member 4 Rings
Most dealerships have discounts on part found on their websites. Besides try some BG44K if you lot get the adventure. I hear it werks wonders.
"Beep beeeep bloop boop" - R2 D2
08-20-201405:35 AM #10
Veteran Fellow member Four Rings 
Originally Posted by rollerton
Information technology is possible for the cluster to go bad and requite the aforementioned error. I'm probably the just one in the world who's had the oil sensor processor in the cluster go bad.
That's very interesting, rollerton. Can you tell me exactly where this sensor in the cluster is, and where you found the replacement part? Equally y'all may know, my three.0 has been flashing the red OP light at me for some time now. Oil pressure is above spec, dropped the pan and cleaned out the mesh pickup screen, and have replaced the OP switch with an off make. I've got a VW/Audi OEM switch coming this week, in a final ditch endeavour to prove that it'due south the switch. If that doesn't work, I may desire to give the sensor in the cluster a cheque.
08-20-201410:57 AM #13
Veteran Member Four Rings
Originally Posted past SlickFix
That's very interesting, rollerton. Can you lot tell me exactly where this sensor in the cluster is, and where you found the replacement role?
In that location's no sensor in the cluster. But..if I remember right upwardly to former in 02'(?) many of the engine /sensor signals were processed through the ECU and the ECU talked to the cluster. After that the cluster programming interpereted the signals directly (or vice versa?). Which is one reason there's a kind of significant VIN# cutoff for clusters in 02/03.
And there'southward no 'sensor' in the cluster, it only has a unlike circuit / programming- if the cluster DOES have the fault the replacement role is a different / new cluster. Oddly, the bad cluster I had was given to me past the Audi dealer Brand NEW. Afterward putting in the NEW cluster They said my oil sensor went bad at the exact fourth dimension I replaced the cluster, "weird coincidence". Huh. Correct. I replaced the oil sensor..didn't fix it.
It took WEEKS of fighting them to get it right. Even afterwards I had installed a different replacement cluster and shown them all was fixed and handed them their BAD $900 cluster (that I didn't need any more) they wouldn't give me a refund. I got Another CLUSTER . Assholes.
Anyway- the RED oil low-cal isn't the oil sensor?, it's the pressure level switch I think (or i of them?). The error I always got was the xanthous oil can with "sensor" under information technology.
foley803 : What does an electric surge sound like? Barking dogs? Watermelons?
08-20-201403:54 PM #14
Veteran Member Four Rings 
Originally Posted by ionicswing
When the oil level sensor light comes on, information technology doesn't hateful that it had no oil in it, it means the oil level sensor is proverb the oil is low.
That all depends upon which light you go. There are iii different warnings:
08-xx-201404:05 PM #16
Veteran Member Four Rings
I've got an showroom "B" staring at me right now. 
Will put in a new sensor this weekend when I change the oil.
08-xx-201405:13 PM #18
Veteran Fellow member Iii Rings 
Originally Posted past rollerton
Anyway- the RED oil light isn't the oil sensor?, it's the pressure switch I think (or 1 of them?). The error I ever got was the xanthous oil tin with "sensor" under it.
Red oil light is triggered when the pressure switch is OPEN (ie pressure level less than about 20psi) and other atmospheric condition are met. Walkey_talkey20 schooled me on this.
The betoken on the B6 does non pass through the ECU. Basically the cluster has a pivot (t32a/sixteen) connected to a single wire which connects to the pressure switch. Switch closed completes the circuit to ground.
In that location must exist some sort of logic bit within the cluster which triggers the warning when the rpm and engine temp are too at the advisable level. The wiring diagram in my repair manual doesn't get any deeper.
So information technology does make sense that a cluster failure could cause a false warning for the pressure sensor merely all the same seems like a very simple simple excursion.
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08-25-201403:12 PM #twenty
Veteran Member Iv Rings
Well my sensor concluded upwards being fine. Some goddamn little rodent got nether the hood and chewed upward a agglomeration of wires. The footling f#@* chewed off the wires right where they go into the harness plug on the oil level sensor too equally the lower radiator hose CTS. I had to hacksaw the harness connectors open then I could go enough wire to hook upwardly a temporary connection. In that location wasn't fifty-fifty enough wire left to de-pin the connectors. I 've got the connectors McIvored for now and ordered new replacement plugs.
08-25-201403:14 PM #21
Veteran Member 4 Rings
Gotta set some mouse traps next time lol.
"Beep beeeep bloop boop" - R2 D2
08-25-201403:15 PM #22
Veteran Member Iv Rings
Originally Posted past WiLl2FLY
Gotta set some mouse traps next time lol.
And I'm going to fire the cat.
08-25-201406:l PM #23
Veteran Fellow member Three Rings
Man that sucks, but at to the lowest degree you know information technology wasn't some Audi electrical gremlins.
A while back I cough 5 mice in my torso. Constitute that they got in through a missing bleed encompass nether the spare and were living off a bag of cub-picket popcorn that had fallen out of my kids backpack or something.
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08-26-2014ten:49 PM #24
Established Member Two Rings
Information technology ended up being a bad oil level sensor. Proficient to go now.
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2004 Audi A4 Quattro Oil Sensor Light
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