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Gas gauge show empty after battery change

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10 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHGas gauge show empty after battery change

Leading reported evidence

Disconnect battery

Suggestion or failed attempt

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
Just filled up gas and the gauge is reading properly, all without disconnecting the battery.
Original post Read captured discussion
Gas gauge show empty after battery change

Suggestion
I think there is a warning in the Owner's Manual about disconnecting the battery with low fuel.
Original post Read captured discussion
Gas gauge show empty after battery change

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Leading evidence: 'Disconnect battery' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Disconnect battery' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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1 matching discussions · 10 captured posts examined · 0 partial discussions

Compare 4 other evidence results

Disconnect battery again (then re-connect it)

Suggestion or failed attempt

No successful repair reported for this finding.

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Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

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Suggestion
On a C4 you will need to fill the tank - disconnect the battery again (then re-connect it) - then it will re-calibrate.
Original post Read captured discussion
Gas gauge show empty after battery change

Fill tank

Suggestion or failed attempt

No successful repair reported for this finding.

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Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

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Suggestion
On a C4 you will need to fill the tank - disconnect the battery again (then re-connect it) - then it will re-calibrate.
Original post Read captured discussion
Gas gauge show empty after battery change

Reset note

Suggestion or failed attempt

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

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Suggestion
Also, if your gas guage doesn't reset, note that there was a recall on C4 cars about the gas gauge only showing 3/4 full after reset, so you might need to bring it to Porsche if that happens.
Original post Read captured discussion
Gas gauge show empty after battery change

Use calculation not

Suggestion or failed attempt

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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion · Original poster
I think I read somewhere that the 2nd half of the tank is mesaured using calculation not with the tank float?
Original post Read captured discussion
Gas gauge show empty after battery change

Frequently discussed actions (6)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Disconnect battery

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
Just filled up gas and the gauge is reading properly, all without disconnecting the battery.
Original post Read captured discussion
Gas gauge show empty after battery change

Suggestion
I think there is a warning in the Owner's Manual about disconnecting the battery with low fuel.
Original post Read captured discussion
Gas gauge show empty after battery change

Disconnect battery again (then re-connect it)

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
On a C4 you will need to fill the tank - disconnect the battery again (then re-connect it) - then it will re-calibrate.
Original post Read captured discussion
Gas gauge show empty after battery change

Fill tank

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
On a C4 you will need to fill the tank - disconnect the battery again (then re-connect it) - then it will re-calibrate.
Original post Read captured discussion
Gas gauge show empty after battery change

Reset note

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Also, if your gas guage doesn't reset, note that there was a recall on C4 cars about the gas gauge only showing 3/4 full after reset, so you might need to bring it to Porsche if that happens.
Original post Read captured discussion
Gas gauge show empty after battery change

Use calculation not

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
I think I read somewhere that the 2nd half of the tank is mesaured using calculation not with the tank float?
Original post Read captured discussion
Gas gauge show empty after battery change

Use stalk and cycle through the choices you'll see

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Switching back to miles can be done from the OBC, just use the stalk and cycle through the choices you'll see.
Original post Read captured discussion
Gas gauge show empty after battery change

Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

10 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

1 acknowledgements have no verified action link; they do not establish a repair result.

Outcome without a verified action link
That did the trick, got the miles back.
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No unique explicit quoted action; no causal link assigned

Generation: 20261026T183130Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Battery died this morning, after 8 years? Maybe... at least it was a original Porsche battery. After a new battery she started right up, but now the gas gauge is showing empty. Normal?

POST 2Original post

On a C4 you will need to fill the tank - disconnect the battery again (then re-connect it) - then it will re-calibrate. I think there is a warning in the Owner's Manual about disconnecting the battery with low fuel.

POST 3 / ORIGINAL POSTEROriginal post

Loren, I will give that a try today. Also I noticed that the speedometer is showing km now instead of mile. How do I switch that back to miles instead? TIA

POST 4Original post

Switching back to miles can be done from the OBC, just use the stalk and cycle through the choices you'll see. Also, if your gas guage doesn't reset, note that there was a recall on C4 cars about the gas gauge only showing 3/4 full after reset, so you might need to bring it to Porsche if that happens.

POST 5 / ORIGINAL POSTEROriginal post

My car doesn't have the OBC option installed.

POST 6Original post

Quotes source post: 4473763

From the manual: "With ignition on, hold adjustment button B turned to the left for about five seconds." Button B is to the upper right of the tach.

POST 7 / ORIGINAL POSTEROriginal post

Thank you! That did the trick, got the miles back.

POST 8 / ORIGINAL POSTEROriginal post

Just filled up gas and the gauge is reading properly, all without disconnecting the battery. I think I read somewhere that the 2nd half of the tank is mesaured using calculation not with the tank float? Or something like that. Thanks

POST 9Original post

that is corret the first halve is measured the 2nd half is gues.............i mean calculated

POST 10 / ORIGINAL POSTEROriginal post

Sorry, I should have RTFM.... Too lazy... all those stupid SOPs they are making me read in the pharmaceutical business is killing me.

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