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Old 04-11-2012, 05:39 PM   #1 (permalink)
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Default Oil Pressure Gauge - Audi 80 Cabrio 2.3

Hi

I would like your help to find what is going on with my Audi, I recently bought.

The thing is the oil pressure gauge and I guess the oil temp too, stopped working.
When I cold start the car the temp stays at minimum and the oil pressure needle goes to max. (5).

Since I bought the car a few days ago, I don´t know if there is an oil light on the dash, if so it doesn't light when I turn the key!

What do you you think about it? Could it be the oil sensor? Or a fuse?!

Thank you for your help.

P.S.: I'll present myself and my car later, now I am looking to solve this asap.
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Old 04-17-2012, 02:42 PM   #2 (permalink)
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The problem you describe is common with, in fact almost typical in, B4 Cabrios and Coupes.
The bad news is that an OP sender for the gauge is stupidly expensive - I believe about £100. The better news is that there is (at least on the 2.0 4 cyl) a separate (cheap) OP switch for the light that should be coming on on your instrument panel. (Just below temp light). I would check the bulb first though, removing the I.P. is easy if you follow the brilliant instructions at:
HOW TO change dashboard lights!! - Audifans.net

I am still trying to sort out the same gauge problem on my Cabrio - I find it hard to believe that all the OP and Temp SENDERS fail together, so I guess there may be something else to try before ripping them out and replacing them.

If I come up with an answer I will post it.
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Old 04-17-2012, 09:14 PM   #3 (permalink)
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Thanks for your help.

There is another sender just below the oil pressure sender (the one with two poles, I guess). That sender has only on pole and it might be the one responsible for the light on the dash.

i will check prices here in Portugal.

Good luck and pls let me know if you solved it.

Last edited by Cabrio80; 04-22-2012 at 06:59 PM.
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Old 04-22-2012, 07:25 PM   #4 (permalink)
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Well, I have just removed the panel and, as you can see in the photo (pic1), it has no oil pressure bulb!
So, I wonder what is the other sender for (Pic2)?



P.S.: The cooling circuit was drained and cleaned so the engine looks bad... for now.
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Old 04-24-2012, 11:54 AM   #5 (permalink)
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I don't know if you have the computer display on your car, if you do, the following does not apply.

The block of lenses you show are the lower block. The oil light should be in the upper block - if you look on the link earlier in the thread you should be able to see three or four bulbs set into the black casing attached to the back of the instrument panel, the OP light is one of those.

I am out of the UK at present but if you haven't solved it before I get home I will check out the documentation that I have on the senders. Provisionally, I think the big one is gauge and OP warning light and the smaller one is a further OP warning light switch of either higher or lower pressure - effectively a "backup". Maybe someone with more detailed knowledge will step up to the plate first!
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Old 04-29-2012, 09:34 AM   #6 (permalink)
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I do have a computer display on it. When I auto-check, everything is fine, even the oil...
So, may be the smaller sender is for the computer!

Since I own other cars, and the sun isn't shining as usual, I haven't done anything to solve the problem, may be next week I will order the sender... and yes it is expensive here too, 100€!!!

Thanks for your help, I can't find anyone experient with this engine!

Last edited by Cabrio80; 04-29-2012 at 04:55 PM.
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Old 06-08-2012, 07:46 AM   #7 (permalink)
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Might be a bit late now but....

Engine Electrics for AUDI CABRIOLET (8G7, B4) 2.0 E - from 01.1993 115 hp ? Spare car parts for AUDI - Engine Electrics - Engine

Around 35 Euro
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Old 06-15-2012, 10:56 PM   #8 (permalink)
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I ordered a new sending unit from Holland (95€), but the gauge needle still stays at max (5 bar). But thank you anyway

I recently bought the car and when I spotted the oil pressure gauge at max never drive it again, because I thought something could be wrong with the oil pump too!

So, I have never checked the gauge with the engine warm and I just watched a video at youtube showing an S2 with the oil pressure at max too (with cold engine) and then it dropped to 2 bar, after a few runs, with the engine warm.

I am starting to think there is nothing wrong with the car... only with it's owner!!

What about your Audi? How is the gauge working?
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Old 06-18-2012, 06:57 PM   #9 (permalink)
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Tested it with warm engine and it works fine.
5 bar - at cold
2 bar - warm

Solved!
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