7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHBattery disconnect = Alarm ?
Leading reported evidence
Disconnect all ok
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Leading evidence: 'Disconnect all ok' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check over' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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Discussions that performed work without a confirmed outcome
1
Discussions that contain suggestions
1
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Performed · outcome unconfirmed · Original poster
To do this I unplugged the sensor connected, reseated it, and disconnected the battery for 10 mins, then everything was OK.
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 performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
When I got the car, I was advised to reset the OBC after a new air mass sensor was fitted (The emission warning light came on) .
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 performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
Doing the reset again, I must have changed the order of doing things, and when I try to undo the batery terminal, the alarm goes off.
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
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Suggestion · Original poster
I am going to take the car in to be checked over, but can anyone help on the battery / alarm thing?
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.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T203514Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi,
Just getting used to my 996 C2 Coupe.
When I got the car, I was advised to reset the OBC after a new air mass sensor was fitted (The emission warning light came on) . To do this I unplugged the sensor connected, reseated it, and disconnected the battery for 10 mins, then everything was OK.
After 70 miles ,the light has come on again. Doing the reset again, I must have changed the order of doing things, and when I try to undo the batery terminal, the alarm goes off.
I am going to take the car in to be checked over, but can anyone help on the battery / alarm thing?
Thanks
Koenig
Migration info. Legacy thread was 20589
my alarm goes off as well when disconnecting the alarm - old t shirt wrapped around it for 10 minutes lessens the pain!
Migration info. Legacy thread was 21183
Hi
If you disconnect the battery the alarm senses it and goes off because it thinks you are trying to disarm it ! Not a lot you can do about that apart from put it in the garage, close the door and go inside. If you put the key in the ignitiontion it might switch the alarm off though.
rgds
Migration info. Legacy thread was 21202
I have found out through Renntech that you need to leave the key in the ignition whilst disconnecting the battery.
You live & learn!
Koenig
Migration info. Legacy thread was 21266
You should have a key that turns you alarm siren off if you disconnect the battery. The lock is on the alarm siren, but it may be a bit tricky to get to
Migration info. Legacy thread was 21273
the only way on a 996/986 is to have the ign on at the time of battery terminal removal - make sure key is still in ign when reconnecting too
Migration info. Legacy thread was 22018
I found out the about this, the hard way, todayon a 03 996 turbo. Disconnected battery to charge it as per handbook. Alarm goes off - and it is LOUD. Quickly reconnect and it goes off after about 20 secs.
Phoned OPC Reading but there was no one "technical" there able to help.
Did a search on here and found answer. May I offer a retrospective thanks. Switched ign on and disconnected, all ok.
Does it need the ign on, or will just having key in and switched off do? I didn't want to experiment and risk it going off again!
Many thanks!
Migration info. Legacy thread was 25415
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