Porsche bulletin No. 88-20
What it saysTechnical information for a Complaint - Oil Leakages on Double-Clutch Transmission (Porsche Doppelkupplung (PDK)): Observe Specified Procedure NHTSA’s full summary ↓
Porsche filed this with NHTSA as a service bulletin dated Apr 1, 2026, received Oct 1, 2020, about the power train — 6 documents under this number. It names 7 model years (2019–2025). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationTechnical information for a Complaint - Oil Leakages on Double-Clutch Transmission (Porsche Doppelkupplung (PDK)): Observe Specified Procedure
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| No. 88-20 | Service bulletin | Apr 1, 2026 | 11030905 | PDF, 1,506 KB |
| No. 88-20 | Service bulletin | Oct 16, 2025 | 11025116 | PDF, 1,518 KB |
| No. 88-20 | Service bulletin | Aug 20, 2025 | 11022925 | PDF, 1,537 KB |
| No. 88-20 | Service bulletin | Feb 16, 2024 | 10251208 | PDF, 1,438 KB |
| No. 88-20 | Service bulletin | Jan 29, 2024 | 10249917 | PDF, 1,417 KB |
| No. 88-20 | Service bulletin | Sep 8, 2020 | 10180510 | not found |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 9P1321359 | under 4A-4B | — | eBay Motors → |
Read by machine from the document NHTSA serves (58 pages), read Sep 30, 2026. A part number is shown only where it matches Porsche’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Doing the repair yourself, or pricing it before the shop does? Search the part by fitment on eBay Motors — the listing and the price are the seller’s.
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Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 7 model years this bulletin names have filed 38 complaints with NHTSA since 2015. 28 of them name Fuel/Propulsion System, Engine, Power Train — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
Two separate instances of fuel line failure and fuel leak in the engine compartment. The first in March 2024 and the second in September 2025. The situations both resulted in fuel leaking on top of the hot engine components. Repair requires removal of the engine and transmission. In 2024 repair time was 9 weeks, in 2025 - 3 weeks.
2021 Porsche 911 · Fuel/Propulsion System · filed with NHTSA Oct 15, 2025 · ODI 11693498
The cars auto idle off function that saves fuel by turning the engine off at stop signs and lights in inoperative. I have had it into multiple dealers 4 times since 12/2020 with the complaint. In my opinion there is a temperature sensor that is malfunctioning and not allowing the car to go into the fuel saving mode.
2019 Porsche 911 · Engine · filed with NHTSA Feb 11, 2021 · ODI 11395726
Strong fuel smell in rear of vehicle, Upon further inspection, it was discovered that a hard fuel line connection was leaking from a fitting on top of a very hot engine and very close to a very hot manifold. Leak was very pronounced and there was strong evidence that this leak and been dropping for some time.
2022 Porsche 911 · Fuel/Propulsion System · filed with NHTSA Jul 13, 2026 · ODI 11750011
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the power train
Source: same model, same component group26 other manufacturer communications filed against the Porsche 911 under the same component group (power train), newest first. The eight newest are listed; the rest are on the Porsche list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| No. 91-26 | Service bulletin | Sep 24, 2026 | Technical Information for Particles/Metal Chips/Residues in Engine Oil |
| SY No. 72-26 | Service bulletin | Sep 23, 2026 | Symptom-based workshop manual for High-Pitched “Whining” and Whistling Noises in Partial Load Operation from the Engine Area. Note that this… |
| No. 72-26 | Service bulletin | Sep 23, 2026 | Symptom-based workshop manual for High-Pitched “Whining” and Whistling Noises in Partial Load Operation from the Engine Area. Note that this… |
| No. 28-26 | Service bulletin | Sep 22, 2026 | Technical information on Transmission Warning Message “P Not Available”, Fault Memory Entries for Parking Lock Buttons in the Shift Console… |
| No. 26-26 | Service bulletin | Sep 22, 2026 | Manufacturer's Certificate for Overview of Approved Porsche C30 Engine Oils. Note that the bulletin includes all models back to model year 1… |
| 18/26 | Warranty extension | Jul 23, 2026 | Warranty Information: Warranty Extension for Transmission Electronics Control Unit (18/26) |
| 09/26 3730 | Service bulletin | Jun 30, 2026 | Permanent Fault Memory Entries “P1775”/“P071400”/“P184900” in Transmission Electronics Control Unit (PDK) (09/26) |
| GR12D787 | Other | Jun 18, 2026 | Parts Withdrawal - Drive Shaft |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Porsche, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Porsche No. 88-20 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the No. 88-20 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every Porsche warranty extension on file lists the ones Porsche has filed.
Which vehicles does No. 88-20 cover?
The manufacturer filed it against 7 model years: 2025 Porsche 911, 2024 Porsche 911, 2023 Porsche 911, 2022 Porsche 911, 2021 Porsche 911, 2020 Porsche 911 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.