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Porsche · Known Issues

2021 Porsche Cayman Problems: 2 Known Issues

2021 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated September 2026

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Issue summary

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2021 Porsche Cayman has 2 documented known issues, with 2 rated critical. The most serious are Recall 21V200000: Connecting Rods May Crack and Loosen (2021 Cayman GT4 / GTS 4.0) and 718 Cayman (982) Gasoline Particulate Filter (GPF/OPF) Failure ($2,500-$7,500 repair). Across all issues with published estimates, repair costs range from $2,500 to $7,500. DIY maintenance guides at au7o.io.

In This Article

  • Cayman Engine1
  • Cayman Emissions1
  • Recalls2
  • FAQ
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In This Article

  • Engine1
  • Emissions1
  • Recalls2
  • FAQ

All 2 Known Issues

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On the 2021 Porsche Cayman, porsche Cars North America recalled certain 2021 Porsche Cayman models — specifically the Cayman GT4 and Cayman GTS 4.0 — under NHTSA campaign 21V200000 (Porsche recall number AMA4) because the engine connecting rods may crack and loosen. If a rod connection comes loose while the car is being driven, the result can be engine damage, an engine stall, or an oil leak, and NHTSA states this raises the risk of a crash or a fire. This is an internal engine defect, so there is nothing an owner can inspect from outside the car; identification is by VIN. The campaign as a whole covers 193 vehicles across all the models included in it (Cayman GT4, Cayman GTS 4.0, 718 Spyder and Boxster GTS 4.0) — that figure is campaign-wide and is not a count for the Cayman alone.

Common Symptoms

  • Engine stalls while driving
  • Oil leak
  • Engine damage

How to Fix

The repair is free of charge at an authorized Porsche dealer. Dealers replace the connecting rods, or replace the entire engine where that is necessary. Porsche mailed owner notification letters on May 21, 2021, so if you bought a 2021 Cayman GT4 or GTS 4.0 used, the letter may have gone to a previous owner — check your VIN yourself at nhtsa.gov/recalls to confirm whether this recall is still open on your car. Porsche customer service can be reached at 1-800-767-7243; reference recall AMA4. Given the stall and fire risk described by NHTSA, do not defer this repair.

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

On the 2019-2021 Porsche Cayman, eU-spec 718 Caymans built from the 2019 model year onward carry a gasoline particulate filter integrated into the catalytic converter assembly. A production-era software fault plus high oil-ash loading causes the GPF to clog and fail, often with no warning light beforehand. Because the GPF is bonded to the cat, replacement is extremely expensive, and Porsche classifies particulate filters as service/wear items excluded from warranty — a major pain point for European owners.

This issue also affects: Porsche 718 Boxster, SEAT Leon, Skoda Octavia

Common Symptoms

  • Engine control warning light
  • Reduced power / driveability issues
  • Increased fuel consumption
  • Sudden failure with no prior warning

How to Fix

Confirm the fault via diagnostics. Apply the updated GPF/OPF software where available and fit the revised filter (e.g. part 982 254 400 AF designed to resist the problem). Use the correct low-ash specification oil and avoid only short trips. Failed units require GPF/cat assembly replacement.

Typical repair cost:$2,500 - $7,500

Research This Issue

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Community Reported
High ConfidenceVerifiedReviewed Jun 2026
NHTSA Recalls2 recalls

SUSPENSION

Porsche Cars North America, Inc. (Porsche) is recalling certain 2021 Porsche Taycan Turbo, Taycan Turbo S, Taycan, Taycan 4S, 911 Turbo S Coupe, Cayman, Cayman T, Cayman S, Cayman GT4, 911 Carrera Coupe, 911 Carrera S Coupe, 911 Carrera 4S Coupe, 911 Carrera 4S Targa, 911 Carrera Cabriolet, 911 Carrera S Cabriolet, 911 Carrera 4S Targa Heritage Design Edition, 911 Carrera 4S Cabriolet, 911 Turbo Coupe, 911 Turbo Cabriolet, 911 Turbo S Cabriolet, 718 Spyder, and Boxster vehicles. Certain suspension components may not have been tightened correctly and can loosen.

Campaign #21V15700010/03/2021

ENGINE

Porsche Cars North America, Inc. (Porsche) is recalling certain 2021 Porsche Cayman GT4, Cayman GTS 4.0, 718 Spyder, and Boxster GTS 4.0 vehicles. The engine connecting rods may crack and loosen.

Campaign #21V20000024/03/2021

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

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Other Porsche Models

Porsche 91131Porsche 718 Boxster18Porsche Panamera17Porsche Taycan13Porsche Macan12Porsche 718 Cayman11

Frequently Asked Questions

What are the most common Porsche Cayman problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2021 Porsche Cayman has 2 documented issues. The most frequently reported are: Recall 21V200000: Connecting Rods May Crack and Loosen (2021 Cayman GT4 / GTS 4.0), 718 Cayman (982) Gasoline Particulate Filter (GPF/OPF) Failure. Of these, 2 are rated critical and should be addressed promptly.

Is the Porsche Cayman reliable?

The 2021 Porsche Cayman has 2 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 2 issues are rated critical: Recall 21V200000: Connecting Rods May Crack and Loosen (2021 Cayman GT4 / GTS 4.0) and 718 Cayman (982) Gasoline Particulate Filter (GPF/OPF) Failure. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Porsche Cayman problems?

Repair costs for known Porsche Cayman issues range from $2,500 to $7,500, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2021 Porsche Cayman Recall 21V200000: Connecting Rods May Crack and Loosen (2021 Cayman GT4 / GTS 4.0)?

Porsche Cars North America recalled certain 2021 Porsche Cayman models — specifically the Cayman GT4 and Cayman GTS 4.0 — under NHTSA campaign 21V200000 (Porsche recall number AMA4) because the engine connecting rods may crack and loosen. If a rod connection comes loose while the… Severity: high.

What is the 2019-2021 Porsche Cayman 718 Cayman (982) Gasoline Particulate Filter (GPF/OPF) Failure?

EU-spec 718 Caymans built from the 2019 model year onward carry a gasoline particulate filter integrated into the catalytic converter assembly. A production-era software fault plus high oil-ash loading causes the GPF to clog and fail, often with no warning light beforehand. Becau… Repairs typically run $2,500-$7,500. Severity: high.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data compiled from NHTSA recalls, manufacturer TSBs, automotive forums, and AI-assisted research. No aggregated owner-report counts available for this vehicle yet.