Re: 2005 Altima - Check Engine Light

 > nycbillhill wrote:
 > Hi
 > I'm sorry if this question was asked already, but My son bought a
2005
 > Altima recently and shortly afterward the check engine light came
on
 > and stays on. He said it  also has hard start as if fuel filter was
 > clogged. Once it does start it remains on, but we woulk like to
know
 > where to look first. Fuel filter, fuel injection, sensor???
 > 
 > Any help would be appreciated.
 > 
 > Bill

It sounds like your son's 2005 Altima is experiencing a
common issue. Here are a few steps you can take to diagnose and
potentially fix the problem:

1. **Check the Trouble Codes**: The first step is to use an OBD-II
scanner to read the trouble codes from the car's computer. This will
give you a specific idea of what might be wrong.

2. **Inspect the Fuel System**:
   - **Fuel Filter**: A clogged fuel filter can cause hard starting
and poor engine performance. Replacing the fuel filter might help if
it hasn't been changed recently.
   - **Fuel Pump**: Ensure the fuel pump is working correctly. A
failing fuel pump can also cause similar symptoms.

3. **Check the Sensors**:
   - **Mass Air Flow (MAF) Sensor**: A dirty or faulty MAF sensor can
cause starting issues and trigger the check engine light. Cleaning or
replacing the MAF sensor might resolve the problem.
   - **Oxygen Sensors**: Faulty oxygen sensors can also cause the
check engine light to come on and affect engine performance.

4. **Inspect the Ignition System**:
   - **Spark Plugs and Wires**: Worn-out spark plugs or damaged wires
can cause hard starting. Inspect and replace them if necessary.

5. **Vacuum Leaks**: Check for any vacuum leaks in the engine bay.
Leaks can cause a variety of issues, including hard starting and
triggering the check engine light.

6. **Battery and Electrical Connections**: Ensure the battery is in
good condition and all electrical connections are clean and secure.

If you're not comfortable performing these checks yourself, it might
be best to take the car to a professional mechanic who can diagnose
and fix the issue more accurately.
 

This is a response to the post seen at:
http://www.jlaforums.com/viewtopic.php?p=46597111#46597111