Is the 2004 Porsche 911 reliable?

It can be reliable when maintained correctly, but it’s not a “set it and forget it” car. A strong service history, regular oil changes, and a thorough pre-purchase inspection make a big difference.

What are the most common 2004 Porsche 911 problems?

Common issues include IMS bearing concerns on Carrera models, rear main seal/oil leaks, cooling system failures (water pump or expansion tank), and suspension component wear that affects ride and tire wear.

Are maintenance costs high on a 2004 911?

Yes, costs are typically higher than mainstream cars due to premium parts, specialized labor, and the complexity of some repairs. Budgeting for preventive maintenance and occasional larger services is recommended.

What are the best years to buy in this era of 911?

Many buyers prefer later 996 years like 2002–2004 for the 3.6L updates, and GT3 models are often viewed as especially robust due to their different engine design. The “best” year still depends heavily on condition and documentation.

What should I check before buying a 2004 Porsche 911?

Get a PPI, check for oil leaks, review cooling system condition, inspect suspension wear, confirm tire/brake condition, and verify service records. On Carrera models, ask about IMS-related work and look for consistent oil service history. For deeper ownership confidence, get a complete owner’s guide with full specs, service intervals, and maintenance schedules tailored to the 2004 Porsche 911.

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Reliability AnalysisBased on known issue patterns, repair cost data, and ownership trends · How we score

2004 Porsche 911 Reliability ReportKeepScore 72/100 · top failure points · buy or avoid

72/ 100

KeepScore

MODERATE RISK

Grade: C-

A truly rewarding driver's car with the potential for five-figure engine repair bills if proper precautions are not taken.

Full system breakdown + what I would do

Quick Facts · 2004 Porsche 911

Outscores the 2002 Porsche 911 by 4 points — one of the stronger nearby years to consider.
The system most likely to surface first: intermediate shaft (ims) bearing (critical severity).
No active NHTSA safety recalls on record — a clean recall slate for the 2004 model year.

2004 Porsche 911: Buy or Avoid?

The 2004 Porsche 911 (996 generation) is an exhilarating performance machine that offers incredible driving dynamics for the price, making it a tempting proposition for enthusiasts. However, its infamous M96 engine carries several well-documented, potentially catastrophic flaws that demand meticulous pre-purchase scrutiny and a significant budget for preventative maintenance, shifting it from a straightforward purchase to a 'buyer beware' situation.

Biggest Strengths

Exceptional driving dynamics and handling balance
Robust braking system and chassis integrity
Engaging manual transmission experience

2004 Porsche 911 — Known Trouble Spots

The systems that break first on the 2004 Porsche 911. Mileage windows, repair costs, and fix-before-you-buy notes are in the full report.

Intermediate Shaft (IMS) Bearingcritical

Engine Bore Scoringcritical

Cooling System & Air/Oil Separator (AOS)moderate

Typical mileage, cost ranges, and the exact what-to-check list are in the full report.

Safety Recalls on the 2004 Porsche 911

No active NHTSA safety recalls on file for the 2004 Porsche 911. Always verify with your VIN atnhtsa.gov.

What breaks on the 2004 Porsche 911?

Full reliability breakdown — engine, transmission, rust, electrical. With repair costs and mileage danger zones.

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Porsche 911 — Year-by-Year Comparison

Compare KeepScores across nearby years of the Porsche 911. Click any year for its full report.

All Porsche 911 years ranked →Porsche 911 years to avoid →Porsche 911 common problems →

Competing 2004s Worth a Look

Similar class, similar year range — ranked by KeepScore.

2002 ToyotaLand Cruiser

92/100

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Frequently Asked Questions

Full Report

2004 Porsche 911

7-system breakdown, mileage danger zones, repair cost projections, buyer checklist, and expert verdict.

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Complete Owner's Guide

Already own one? Get the 13-chapter owner's guide with specs, service schedules, and fluid capacities.

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Same Model, Other Years

2002 Porsche 91168 2003 Porsche 91172 2005 Porsche 91168 2006 Porsche 91172

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2004 Porsche 911 Reliability ReportKeepScore 72/100 · top failure points · buy or avoid

2004 Porsche 911: Buy or Avoid?

2004 Porsche 911 — Known Trouble Spots

Safety Recalls on the 2004 Porsche 911

Porsche 911 — Year-by-Year Comparison

Competing 2004s Worth a Look

Relevant Products for Your 2004 Porsche 911

Frequently Asked Questions

2004 Porsche 911

Complete Owner's Guide

Compare This Vehicle

Same Model, Other Years

Know every issue before you sign.

Just bought a 2004 Porsche 911? Keep it that way.

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