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Gas gauge off after battery replacement

996scott
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996scott Member

996scott

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Posted

Installed a new battery a while back in my 2000 C2 (believe it or not, the original battery lasted 8 yrs! That must be some kind of record). I read up on a few things and it sounded like sometimes the gas gauge will not register correctly afterwards. I filled my tank before changing the battery, but it seems like the gauge is off a little. Does the dealer need to reset the computer? If so, is it a really quick fix? Thanks. Scott

wross996TT Member

wross996TT

Posted
Posted

How much is it off and how do you know? Note the fuel level sensor need not be calibrated if the battery was disconnected. The values are stored in the instrument cluster. Calibrating the fuel level sensor is not an easy thing. It requires removal of the sensor, all of the fuel, refilling the tank with an exact amount of fuel (12 litres) and calibrating using a PST2 or PIWIS.

topmech0 Member

topmech0

Posted
Posted
How much is it off and how do you know? Note the fuel level sensor need not be calibrated if the battery was disconnected. The values are stored in the instrument cluster. Calibrating the fuel level sensor is not an easy thing. It requires removal of the sensor, all of the fuel, refilling the tank with an exact amount of fuel (12 litres) and calibrating using a PST2 or PIWIS.

i may be wrong but i thought it was only the C4 with the saddle tank that needed calibrating after battery disconnection. loren will know for sure though

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Loren Member

Loren

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  • Admin
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topmech0 is correct - you should not have to recalibrate a C2. It should correct itself the next time you fill up.

If not, after the fill up disconnect the battery for 5 minutes then reconnect it.

wross996TT Member

wross996TT

Posted
Posted (edited)
How much is it off and how do you know? Note the fuel level sensor need not be calibrated if the battery was disconnected. The values are stored in the instrument cluster.

i may be wrong but i thought it was only the C4 with the saddle tank that needed calibrating after battery disconnection. loren will know for sure though

That is what I posted! (it was a direct quote from the workshop manual BTW)

Edited by wross996TT
996scott Member

996scott

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Thanks guys. I'll refill a few times and see how it goes. I thought it was off because after changing the battery and going through a tank of gas the needle was on empty and the computer said "0" miles to empty. When I filled it, it only took about 12-13 gallons so I thought it was off. I'll fill up again and check it. Thanks again. Scott

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