Question about 2002 Nissan Altima

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Started to notice that the engine began to run rough then would be ok for awhile. The service engine soon light would come on when it ran rough and then go out when it ran fine. Now the service engine light is on most of the time and when you accelerate it begins to flash, then stops flashing when you let off the gas. Light still occasionally goes off but not as often. Seems to be worse with cooler outside temperature.

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Hi,

The first thing you need to do is have the vehicle scanned for fault codes which will be stored in the vehicles ECU. This will provide a clear diagnoses of the fault.

Without this anything else is pure guess work. Often these type of faults are related to faulty sensors such as MAF or O2 sensors or Coolant temperature sensor on the vehicle.

Other causes may relate to a problem within the electrical or fuelling system and the stored fault codes will give a clear pointer as to the cause of the problem. This can range from a faulty spark plug to a problem with the timing on the vehicle or the crankshaft sensor or a problem with the emissions system on the car.

As modern vehicles have several sensors it is vital to have these fault codes checked to identify the root cause of the problem. Some Auto parts stores such as Autozone will do a scan of the vehicle for free or for a minimal charge.

Hope this helps. Please do rate this answer. Many Thanks.

Posted on Sep 24, 2009

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