13 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHHelp - Non-start Problem
Reported or suspected cause
immobilizer
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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 report identifying a cause
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported cause · Original poster
My mechanic scanned the fault code and said it was the Immobilizer.
Leading evidence: 'immobilizer' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'immobilizer' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check ignition coils' (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 performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
We checked the coil with an Ohmmeter and reads 12 Ohms, which is correct per the repair manual.
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
We replaced the transponder but the car still won't start.
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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Suggestion
With the cheap PIWIS clone you will be able to check all the messages stored in the immobilizer.
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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Suggestion · Original poster
We checked the coil with an Ohmmeter and reads 12 Ohms, which is correct per the repair manual.
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.
13 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.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T191851Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello,
I need some help with my 99 996 C2. It does not crank. The battery is good and everything seems to power up ok when I turn on the ignition. When trying to crank there is no response. My mechanic scanned the fault code and said it was the Immobilizer. I sent the Immobilizer to ECU Doctors and they could not find any problem.
We want to test the data stream from the rfid coil to the Immobilizer. We have the schematic and see there is a transponder between the coil and the Immobilizer. However, we cannot locate the transponder.
Where is the transponder?
Can we test the coil with an Ohmmeter?
If we use an oscilloscope, what should the signal look like?
Thank you.
The transponder antenna is a round ring around the ignition lock. The transponder itself is inside the key head.
There is also a small box attached to the ignition lock that the transponder antenna connects to if I recall.
I thought that when a start was attempted without a valid immobilizer signal that a fault code "immobilizer defeated start attempt" was stored though this might be on newer ones only.
@Viper1000
What is the ignition module? There is no part by that name in the manual.
We checked the coil with an Ohmmeter and reads 12 Ohms, which is correct per the repair manual. We replaced the transponder but the car still won't start. When we hard ground the control terminal on the starter relay the starter runs but the engine will not start.
We are not getting any codes now but the car still does not crank. If we get the cheap PIWIS tools mentioned here:
https://rennlist.com/forums/997-foru...only-75-a.html
will we be able detect the presence of the key with the rfid pill when it is inserted in the ingntion switch?
I think he means the Ignition switch. It is a DIY for sure.
Ignition Switch Genuine Porsche 4B0-905-849 4B0 905 849 4B0905849 4B0.905.849 | Pelican Parts
You got that "Some-timers " Disease ...I get that sometimes....lol
Op..yes you need to get that $75 PIWIS set-up... it is invaluable for tricky diagnostics ...
I have some-timers disease more often than I care to admit.
Thanks for the input on the PIWIS. I will go ahead and get it. Hopefully it will help solve the problem with my car.
Hooray, my car is fixed and running again! The mechanic found a bad power wire going to one of the computers. Thank you for all your help and suggestions.
I ordered the PIWIS clone. It will arrive in a few weeks. Even though it is no longer necessary to solve the non-start problem, I can have fun learning how to use it and get nervous if the cam deviation is nearing the end of the servicable range at 180k miles.
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