Davi926

Fuel Gauge reads zero! A6 2005 3.0TDI

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Hi all.

Kind of exhausted all avenues here so im asking to see if anyone can help.

Bought my A6 avant a few months ago from a private seller and noticed it was low on fuel so took it to the fuel station and filled up and was half way home when i realised the fuel warning light was on and it was telling me i had zero range and needed to fill up. Got it home and seller wont answer texts or calls ( Probably got the first flight out the country lol ).

Ive had it on a few occasions when ive put my foot down and gunned it to get the gauge to read what is in the tank and it'll go back to zero when I start it again. This happens very rarely though so can never get it to happen when I want it too. Ive had it once where its been working for three trips one after the other on the same day but stopped working over night.

Pretty sure when it does work it tells me what I have in there at that exact moment and stays that way as the range doesn't go down.

Things ive done since ive had it is have the fuel pump / sender out and play with the connectors (nothing happened) tapped both sides with the car running to see if the gauges move (Nothing). Replaced the Fuel pump and sender for another used one from a working car. Nothing at first but two days later after changing it with the battery disconnected it worked and continued to work until today (3 Days) where it read zero. Not sure if it has anything to do with how much is in the tank but i was between 3 quarters and full. Not sure if it working for 3 days is a coincidence?

Also tried pulling fuse 15 and no result.

So as you can see im lost for ideas of what I can try next as I feel there is nothing apart from hanging it over to audi themselves to diagnose it and ive read stories that theyll just change anything will nilly until they find the fault.

Many thanks guys.

 

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This is definitely a common fault on the C6. It’s on mine also.

I believe from memory there are two floats/senders on the tank, have you found both and played with them?

Others have said that the terminals just need a clean. Thought mine had a touch of the fairies and fixed itself but alas it’s not reading at all again.

As mine is off the road for a while I won’t be able to attempt to fix it but if I can I will have a look next weekend.

Hope you get to the bottom of this soon.

 

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16 hours ago, Dan3222 said:

This is definitely a common fault on the C6. It’s on mine also.

I believe from memory there are two floats/senders on the tank, have you found both and played with them?

Others have said that the terminals just need a clean. Thought mine had a touch of the fairies and fixed itself but alas it’s not reading at all again.

As mine is off the road for a while I won’t be able to attempt to fix it but if I can I will have a look next weekend.

Hope you get to the bottom of this soon.

 

Ok thankyou for that.

All i did was change the one on the driver's side as that's the one with the electrical connector. I'll have the other side out and see what that does.

I'll let you know

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Ive gone and bought VAG COM. I needed it any way to reset my service schedule.

This is what im getting.

4 Faults Found:

 

00438 - Fuel Supply Sensor 2 (G169)

            010 - Open or Short to Plus

             Freeze Frame:

                    Fault Status: 01101010

                    Fault Priority: 7

                    Fault Frequency: 254

                    Reset counter: 103

                    Mileage: 143532 km

                    Time Indication: 0

                    Date: 2017.03.16

                    Time: 19:09:31

 

00438 - Fuel Supply Sensor 2 (G169)

            007 - Short to Ground

             Freeze Frame:

                    Fault Status: 01101010

                    Fault Priority: 7

                    Fault Frequency: 254

                    Reset counter: 103

                    Mileage: 143532 km

                    Time Indication: 0

                    Date: 2017.03.16

                    Time: 19:09:31

 

00771 - Fuel Level Sensor (G)

            010 - Open or Short to Plus - Intermittent

             Freeze Frame:

                    Fault Status: 00101010

                    Fault Priority: 7

                    Fault Frequency: 1

                    Reset counter: 117

                    Mileage: 208465 km

                    Time Indication: 0

                    Date: 2019.01.27

                    Time: 09:38:24

 

01314 - Engine Control Module

            004 - No Signal/Communication - Intermittent

             Freeze Frame:

                    Fault Status: 00100100

                    Fault Priority: 2

                    Fault Frequency: 1

                    Reset counter: 120

                    Mileage: 208531 km

                    Time Indication: 0

                    Date: 2019.01.27

                    Time: 16:11:21

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I wish I had VCDS tbh but not always sure what all the readings mean. But, looking at yours surely it’s pointing to bad connections or a broken wire?

Maybe an good old google search with the fault codes and see if you get more info else where. I don’t have time tonight but I will have a good search on it tomorrow, see what I can find on it.

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Out of interest which VCDS did you buy and how much? I am wondering if it would read all VAG vehicles?

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Sorry, last post before I drive home tonight. Did you try resetting fault codes?

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On 3/20/2019 at 5:46 PM, Davi926 said:

Ive gone and bought VAG COM. I needed it any way to reset my service schedule.

This is what im getting.

4 Faults Found:

 

00438 - Fuel Supply Sensor 2 (G169)

            010 - Open or Short to Plus

             Freeze Frame:

                    Fault Status: 01101010

                    Fault Priority: 7

                    Fault Frequency: 254

                    Reset counter: 103

                    Mileage: 143532 km

                    Time Indication: 0

                    Date: 2017.03.16

                    Time: 19:09:31

 

00438 - Fuel Supply Sensor 2 (G169)

            007 - Short to Ground

             Freeze Frame:

                    Fault Status: 01101010

                    Fault Priority: 7

                    Fault Frequency: 254

                    Reset counter: 103

                    Mileage: 143532 km

                    Time Indication: 0

                    Date: 2017.03.16

                    Time: 19:09:31

 

00771 - Fuel Level Sensor (G)

            010 - Open or Short to Plus - Intermittent

             Freeze Frame:

                    Fault Status: 00101010

                    Fault Priority: 7

                    Fault Frequency: 1

                    Reset counter: 117

                    Mileage: 208465 km

                    Time Indication: 0

                    Date: 2019.01.27

                    Time: 09:38:24

 

01314 - Engine Control Module

            004 - No Signal/Communication - Intermittent

             Freeze Frame:

                    Fault Status: 00100100

                    Fault Priority: 2

                    Fault Frequency: 1

                    Reset counter: 120

                    Mileage: 208531 km

                    Time Indication: 0

                    Date: 2019.01.27

                    Time: 16:11:21

 

I presume the car is quattro with 80l tank that has 2 senders .

Faulty sender on passanger side. Its a common fault on a6 c6 . There are few ways to get it fix. Did you manage to get it working now ?

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35 minutes ago, niedzial1983 said:

Yeah that's the one I replaced the driver's side. Typical. Haven't fixed it yet as I'm driving to get the fuel down. What's the easy fix?

Play with the connectors?

Thanks

I presume the car is quattro with 80l tank that has 2 senders .

Faulty sender on passanger side. Its a common fault on a6 c6 . There are few ways to get it fix. Did you manage to get it working now ?

 

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23 hours ago, Dan3222 said:

Out of interest which VCDS did you buy and how much? I am wondering if it would read all VAG vehicles?

I got the full vcds hex+can but it's a cracked version so stuck on 12.12. works fine though. Was £50 on eBay. Reset the codes yeah

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22 hours ago, Davi926 said:

 

In esence yes. So

fix one to remove the bench and cover plate held by 3 screws. Then unplug electrical connectors , clean with contact cleaner and put back 

Of this does not fix then you would need to take the sende out , plastic ring can be a pain to unscrew but few taps of a hamer through a wood block dose it. On the sender there is a connector hanging out that fails. Best option would be to cut it out and solder the cables. 

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Ok thankyou for that I'll try that tomorrow. Would soldering something that's been in diesel be smart? 

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Watching with anticipation.

Be great of you could take a couple of photos to help other (and me)

dont forget to hoover like crazy before you open the large plastic nut. You don’t want crud getting into the fuel.

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1 hour ago, Davi926 said:

Ok thankyou for that I'll try that tomorrow. Would soldering something that's been in diesel be smart? 

Well you would obviusly clean and degress all prior ...

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I'll be cautious not to use anything electrical near the opening. I'll get light through a gas lantern that should be safe

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I could send u a box of safety matches, my shout!!

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16 minutes ago, Dan3222 said:

I could send u a box of safety matches, my shout!!

It says safe on the box that means I can trust it 😂

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