5 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
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YOUR RESEARCHSpare fob not working - Page 1 - Boxster/Cayman - PistonHeads UK
Leading reported evidence
Repair ' service
Suggestion or failed attempt
No successful repair reported for this finding.
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0
Unsuccessful attempts
1
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Suggestion · Original poster
I've seen a few websites offering a 'repair' service for £60 ish but I'd live with one key if I have to.
Spare fob not working - Page 1 - Boxster/Cayman - PistonHeads UK
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Leading evidence: 'Repair ' service' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Repair ' service' (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.
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
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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
If I unlock using the 'good' key, I can start and run the car with the spare so the chip in it is still recognised.
Spare fob not working - Page 1 - Boxster/Cayman - PistonHeads UK
Use 'good' key, i can start
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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
If I unlock using the 'good' key, I can start and run the car with the spare so the chip in it is still recognised.
Spare fob not working - Page 1 - Boxster/Cayman - PistonHeads UK
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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.
5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
PistonHeads: 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: 20261027T011819Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Common problem it seems. My spare key fob (2003 Boxster S) wouldn't work, discovered it's battery was down to 2.7V. Replaced it with a fresh one but although it flashes red when pressing the buttons, the car will not unlock or lock if unlocked with other fob.
A search suggested locking and unlocking the driver's door without opening it but this did nothing. Actually, I think that is the procedure if you haven't opened it for over 5 days. Does it need reprogramming? I've seen a few websites offering a 'repair' service for £60 ish but I'd live with one key if I have to. My last car only had 1 key for 3 years, and it was a Fiat, not known for electrical sturdiness.
Johnthepotter said:
Try inserting key and unlocking door. Then press unlock button on key while it is still in lock. This should re synchronise the key with the alarm.
If that don't work, put into ignition, switch on and then press the open button.
Key out and see if it locks/unlocks.
Thanks for the suggestions. I tried both and it still doesn't work.
If I unlock using the 'good' key, I can start and run the car with the spare so the chip in it is still recognised. But the remote buttons don't work to open the car or disarm the alarm. If I unlock the door with the key manually and open it the alarm goes off, which it should I suppose.
I am not sure about the formal re-syncing process but I used to unlock with the bad key in the door.
Then before too much alarm - put it in the ignition and turn the car on fully.
The alarm should stop, I think.
Then turn the car off and then the electrics back on (don't fully start the car) - repeat a few times - don't take the key out.
Then with it still in the ignition - press the unlock/lock button and the car should lock.
Then check it works.
I never worked out the exact process but essentially having opened it with the key in the door - putting it in the ignition and wiggling it a few times usually got the remote working again.
Good luck because otherwise it's £75 from a dealer I believe.
This is a source reference. Confirm exact model applicability in the original material.
