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Another D7 code.. Another D7 code..
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Old 23rd September 2008, 09:08   #1
OC e39r
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Another D7 code..
Last night when I was parking the car, I noticed that the fuel gauge is still reading half a tank,although I drove +150 miles all day. I was too tired to check so I left it till the morning. And sure enough when I turned on the car today the unpleasant yellow light was on and the needle was on E. I conducted test no. 14,and those are the results..
DIAG 1 D7 81 047
DIAG 2 90 84 000
DIAG 3,4&5 00 00 000

While filling her up, I noticed the needle is moving smoothly till full,and test no. 6 became 34L/31L/65L, with the 34L reading declining gradually while driving-which indicates the fuel pump is healthy..good.
I had a similar problem a few weeks ago,and the fuel sensor was replaced,but test no. 14 was slightly different, as follows:
DIAG 1 D7 81 155
DIAG 2 BF 88 000
DIAG 3 90 84 000 - WHICH BECAME DIAG 2 THIS TIME
DIAG 4&5 00 00 000

Now, is it the same sensor failing again?. Is it common to fail twice few weeks apart? or it is a different problem??

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Old 23rd September 2008, 15:51   #2
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Which level sensor/sender did they replace? Left or right?
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Old 23rd September 2008, 17:49   #3
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left, pn 1 61 41 183 179. So the right one is due you think?. Should I replace the sucking pump while at it?
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Old 23rd September 2008, 19:14   #4
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Similar situation to mine. In my case, the sensor was replaced, but the dealer DID NOT reset the error. The 155 and 47 will decrement each time the car is started. I have no idea what the 81 is, but mine is the same 81.

I was told by multiple folks that it must be reset by the dealer.

I have no idea of what the 90 is, but I would have it investigated and reset.

It is also possible you have another failed sensor. Warranty applies to it as well. 1 year, if my memory is correct.

I suppose it could even be the guage.

(D7 is the syphon ... left ... pump)

I am wondering how many gallons your fill took. It should have been over 15.5 gallons.
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Last edited by jclyman; 23rd September 2008 at 19:18.
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Old 23rd September 2008, 19:22   #5
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Took 16.5 gallons to fill. And test 14 was all zeros after the sensor was changed at the dealer's under CPO. I think if it was just a resetting problem the needle would not be stuck half way while the car is getting low on gas. Which one did u replace? is the sucking pump relevant to this problem?. BTW the first one failed due carbon build up, in case this will add anything
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Old 23rd September 2008, 21:49   #6
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Quote:
Originally Posted by OC e39r View Post
Took 16.5 gallons to fill.
That's good.
Quote:
Originally Posted by OC e39r View Post
And test 14 was all zeros after the sensor was changed at the dealer's under CPO.
That's good, too.
Quote:
Originally Posted by OC e39r View Post
I think if it was just a resetting problem the needle would not be stuck half way while the car is getting low on gas.
True. It could be the guage.
Quote:
Originally Posted by OC e39r View Post
Which one did u replace? is the sucking pump relevant to this problem?.
It was, hence the "D7." (D7 = syphon pump failure) But, you said you have another "D7." That is suspicious. And, the "90" is also coming back. You need to find out what the "90" is telling you.
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Originally Posted by OC e39r View Post
BTW the first one failed due carbon build up, in case this will add anything
No, it wasn't carbon build-up. There was probably a carbon deposit on the sensor "spring," but that is caused from arching. Very common on all sensors in the gas tanks of all BMWs.

What did you computer say? How much Range and all.
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Old 23rd September 2008, 23:31   #7
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Last readings..
test no.14 DIAG 1&2 still as above
test no.06 29.8L/30.0L/59.8L
range 270 miles.
Don't know wts the 90 code refers to yet..had it twice now but as I said it cleared the 1st time after changing the left sensor
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Last edited by OC e39r; 23rd September 2008 at 23:33.
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Old 24th September 2008, 01:30   #8
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Hum m m ...

Was the engine running when you read the last Test 14 measurements? The fuel normally returns to the left tank with the engine off. Since the readings are very close to level, it looks like the engine was off.

When I asked about the Range, I was wondering what is was when you refueled. Sorry for the confusion.

I would still want to know what the "90" indicates. It may point to the ultimate problem you are having.
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Old 27th September 2008, 08:37   #9
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So if the range was moving proportionally with the gas level, then it is a sensor problem rather than a gauge problem?. I dont know about the 90 yet but will stop by the dealer's tomorrow and ask the SA..
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