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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHrear plastic leak onto ECU? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Reported or suspected cause
often clogged drains beside the engine compartment
Reported cause
No successful repair reported for this finding.
1
Identified cause
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Suspected cause
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Reported fixes
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Reported cause
Along with a bad rear window, the problem is often clogged drains beside the engine compartment.
rear plastic leak onto ECU? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'often clogged drains beside the engine compartment' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'often clogged drains beside the engine compartment' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check links now' (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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rear plastic leak onto ECU? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Clean connectors
Suggestion or failed attempt
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rear plastic leak onto ECU? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Clean drains regularly so it doesn't happen
Suggestion or failed attempt
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Suggestion
Clean your drains regularly so it doesn't happen again.
rear plastic leak onto ECU? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Repair &t=ffab&atb=v405-1&ia=web
Suggestion or failed attempt
No successful repair reported for this finding.
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Reported fixes
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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
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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.
rear plastic leak onto ECU? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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.
6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
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0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261027T003124Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello, new member here, from Hawaii. About to begin a life's dream of owning (done) and hopefully driving a 2001 boxster s. Long story but neglected outside for 6yrs, other than oil change and safety each year. Paid only 2k, BUT rear plastic leak has allegedly "fried the ECU". At some point the ecu kept locking and unlocking the driver door, burnt the motor. Now there seems to be a lockout with no electronics.
I know this could be a nightmare scenario, but in for the gamble. Prior owner believes the ecu can be removed and sent for diagnostic and ? repair as 1st step.
I suspect huge topic, what would be great is if any of you Pro's could speculate on first the possible extent of electrical gremlins i am about to unleash, and secondly are there any tips on the logical sequence to approach this?
She has not been towed to me yet, so other than exterior viewing, that's all I got, for now.
Many thanks, in advance
garry
Just a quick bit of info for you, more later. The ECU (Called the DME by Porsche) in the rear trunk does not normally get damaged by a leaky rear window. The thing that gets wet and corrodes is the Central Locking Module under the driver's seat. It's often referred to as the immobilizer box. If it is lightly corroded it can sometimes function again after being dried and carefully cleaned. If the car has sat for years in Hawaii, chances are that it will have to be replaced.
Try this link to a search of the forum:
https://duckduckgo.com/?q=site%3A986forum.com+immobilizer+wet+repair&t=ffab&atb=v405-1&ia=web
More...
If it is a case of a bad 'immobilizer box' there are a variety of solutions.
ECUDoctors.com has been repairing these for years. There are also some vendors on eBay that offer repair service.
Buy a good immobilizer box and have the chip with the car's data transferred from the corroded board.
Buy a complete matching set of immobilizer box + key transponder + DME from a similar year and model car and swap it all in.
Spend more than you paid for the car for a dealership to repair it.
* I'm pretty sure that 'Qmulus' who has been mentioned in many related threads is fully retired now and no longer repairs these.
If battery power was applied for a long time with the immobilizer box corroded, it may have damaged some of the wires that connect to it. Inspect them and clean all the connectors.
Along with a bad rear window, the problem is often clogged drains beside the engine compartment.
Clean your drains regularly so it doesn't happen again.
https://986forum.com/forums/boxster-general-discussions/73399-blocked-convertible-drain.html
https://986forum.com/forums/diy-project-guides/64615-water-battery-area-1999-boxster.html
ECU Doctors also sells a waterproof box to put the immobilizer into . If/when you get this sorted out and running that box could save you $$$ in the future .
This is a source reference. Confirm exact model applicability in the original material.
