2004 Volvo S40n problems

Common 2004 Volvo S40n problems

Based on the information provided in the sources, here are some common problems with the Volvo S40N 2004 as reported by owners:

1. Fuel Rail Pressure Sensor Issue:
   • The fuel rail pressure sensor is a common problem in the Volvo S40N 2004. This sensor communicates with the vehicle's computer to manage fuel pressure, affecting the engine's performance. Symptoms include lack of power, stalling, increased fuel consumption, and a check engine light.
   • Fix: Replacing the fuel rail pressure sensor can resolve these issues.
2. ECM Communication Problems:
   • Owners have reported ECM communication issues, such as codes ECM-740C, CEM-6C54, and CEM-3A00. These codes indicate problems with the central electronic module, leading to starting and cranking issues.
   • Fix: Reloading the ECM software at a dealer or replacing the ECM may be necessary to address these communication errors.
3. Vacuum Pump Running Constantly:
   • Another common problem is the vacuum pump running continuously even after the engine is turned off. This issue is often linked to vacuum leaks from hoses or the check valve.
   • Fix: Replacing parts related to the external vacuum pump, such as hoses or the check valve, can help resolve this issue.
4. Starting Issues and Immobilizer Problems:
   • Starting issues related to the immobilizer system have been reported by owners. Codes like CEM-6C54 and CEM-3A00 indicate faults in the ECM software, affecting the engine's ability to start.
   • Fix: Troubleshooting the immobilizer system, checking ECM codes, and potentially reloading the ECM software or replacing the ECM can help address these starting problems.

These common problems with the Volvo S40N 2004 can impact the car's performance and reliability, requiring specific diagnostic steps and repairs to ensure proper functioning.

What is the common problem with Volvo S40?

There are two weak points in the oil system, the fuel pump and the water pump. When either of these fails, it causes overheating and means that your car will be using a lot more oil. If you're using excessive amounts of oil, or you notice any performance problems, checks that the pumps are both working correctly.

Is Volvo S40 a reliable car?

The Volvo S40 is generally considered a reliable vehicle because of its decent ownership costs, great gas mileage, and above-average consumer ratings. Many owners of the S40 rarely bring in their vehicles for major repairs.

How many miles will a Volvo S40 last?

The estimated lifespan of a Volvo S40 is 286,000mi, before reaching the life expectancy upper limit. Fuel type is a major factor when looking into a vehicles lifespan/life expectancy.

Why did Volvo stop making the S40?

Volvo will stop selling its mid-size sedan, the S40, and its station wagon “twin”, the V50, in the USA during the 2012 MY. The reason? You guessed it; poor sales.

What is the common problem with Volvo S40?

There are two weak points in the oil system, the fuel pump and the water pump. When either of these fails, it causes overheating and means that your car will be using a lot more oil. If you're using excessive amounts of oil, or you notice any performance problems, checks that the pumps are both working correctly.

Is Volvo S40 a reliable car?

The S40 is well designed and built and that means a reliable run for the most part. There are no serious flaws that afflict it; the things that tend to go wrong are fairly minor and individual. Volvos tend to be well looked after by caring owners, which can make them a good used buy.

How many miles will a Volvo S40 last?

The estimated lifespan of a Volvo S40 is 286,000mi, before reaching the life expectancy upper limit. Fuel type is a major factor when looking into a vehicles lifespan/life expectancy.

Why did Volvo stop making the S40?

Volvo will stop selling its mid-size sedan, the S40, and its station wagon “twin”, the V50, in the USA during the 2012 MY. The reason? You guessed it; poor sales.