MFTS rubber boot

[Michael S2]

Yes still available from Audi

[le mans]

443 971 876 A for the grommet

Excellent, thanks

[Mikes2]

443 971 876 A for the grommet

[andy10v]

And nobody actually answered by question he he.

Have you asked Audi? Shows in ETKA IIRC.

You will need to take the connectors out the plastic plug to get them through the grommet.

[le mans]

And nobody actually answered by question he he.

[macspring]

interesting topic, so I will hijack it.

A man after my own heart.

( I'm guilty of this a number of times as well ).

[domas]

is it? must have overlooked it. or maybe s2 cluster is different in this regard, but i'd doubt it.

[Nuvo]

The heat sink is also gnd.

[domas]

i can't stop wondering why could that be the case - as regulator uses 3 pins, vin, gnd and vout. Tab is connected to heat sink which is not connected anywhere. Why would any resistance matter there?

[ThatGUY]

@Newsh... Great info, cheers

[domas]

will mess around with mine as well

[newsh]

Yes they both use the voltage from the regulator bolted to the back of the cluster. What fixed mine was to remove the captive washer from the regulator, it seems there was corrosion or some kind of resistance between the washer and the regulator. My temp and fuel gauges have been fine since.

[domas]

What is the correlation between the MFTS and low reading fuel gauge?

My guess is that both use regulated 10v reference.

[ThatGUY]

So a question, does the fuel gauge also read low?

What is the correlation between the MFTS and low reading fuel gauge?

[domas]

interesting topic, so I will hijack it.

Both my temp gauge is slightly low and fuel gauge is quite low.

Temp gauge can be explained by mediocre quality behr MFTS, which is okay compared to other aftermarket crap, it is some 5C low, not a big deal. It got low after i swapped it from another behr sensor that was spot on, but it had false overheat signal.

Fuel is a different story. It show full with the full tank but it is only so because i have adjusted it with adjustment screw to do so. I can see it is not behaveing as supposed, as fuel tank capacity is not linear, and non-linearity is in wrong spot. It just happened at some point that it started to show about 15-20 liters low (80l tank in my car). SO I have just adjusted it according to bentley. I have a spare sender, they both have the same resistance range. Sensor arm in ok shape, not bent or so.

I think there is a problem with my cluster, because:
a) voltage regulator outputs a bit low but within tolerances of repair manual. chaned to spare one, no differnece, same output though. IIRC 9.6V instead of 10v
b) board computer shows that i have 1600-2000 kilometers to go on my tank. should be 800 with full tank. THe value adjusts +-10% with a little potentiometer. but i need like 100%.
c) other 5 BC functions are spot on.
d) Every single solder joint is resoldered in the cluster apart from huge *** chips.
e) tried a different BC, same result.

my car is 200 20v, but the systems are very similar to s23b

any ideas?