Most common 2003 Porsche 911 problems
Share of the 9 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Porsche 911 complaints by model year
Best 911 years: 2000, 2001. Compare all years →
NHTSA defect investigations
Federal safety investigators have looked into a possible defect involving the 2003 Porsche 911:
Rapid coolant loss
On April 26, 2013, the Office of Defects Investigation (ODI) opened PE13-009 to investigate 10 complaints alleging incidents of sudden coolant loss while traveling on public roadways in certain model year (MY) 2001 through 2007 Porsche 911 vehicles.The complaints alleged that pipe ends joined by epoxy to certain cooling system components may fail suddenly and separate, resulting in large volumes of coolant…
What 2003 Porsche 911 owners say
Engine & cooling
I was driving my car to a charity event hosted by a high school tennis team when I noticed steam coming from my engine bay. All my cars coolant leaked out into the parking lot and it created a very large puddle. My wheels were covered in coolant and it created an unsafe driving condition for the participants behind me who were follow me into the car was. As all of the coolant evacuated my car, it is a miracle that it did not happen on the freeway where it could have caused an accident. Because the cause of this was faulty coolant lines, my alternator was also shorted and need to be replaced, again, if this happened on a long trip or on the freeway I could have been stranded.
Entered highway and reached highway speed, low coolant light appeared and large cloud of smoke exited the rear of the car. Pulled over and engine bay smoking with coolant everywhere inside engine bay and over rear of car including tires. Coolant had completely drained due to a glued in fitting which had come loose.
Frequently asked questions
Is the 2003 Porsche 911 a good car?
Based on 9 owner complaints filed with NHTSA, the 2003 911 rates few complaints: about as many complaints as a typical year of the 911 at the same age. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2003 Porsche 911?
The engine & cooling — 4 complaints, 44% of all complaints for this model year. Next are the a/c & heater (1) and equipment & accessories (1).
How many recalls does the 2003 Porsche 911 have?
NHTSA lists no recalls for the 2003 Porsche 911. You can still confirm with your VIN using our VIN recall check.
What are the best and worst years of the Porsche 911?
The best years by complaints, compared at the same age, are 2000 and 2001. See the full Porsche 911 years comparison.
At what mileage do 2003 Porsche 911 problems happen?
The median mileage reported in complaints is about 69,000 miles; 17% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.