Under the Hood: 1999 Nissan Altima 2.4L

Our featured Under the Hood candidate is a 1999 Nissan Altima. The Altima uses a 4 cylinder engine and is a front wheel drive car, so the general layout of the engine components will be similar to most other 4 cylinder, FWD vehicles.


  1. Engine Oil Cap
  2. Engine Oil Dipstick (hidden from view in photograph)
  3. Radiator
  4. Radiator Cap
  5. Upper Radiator Hose
  6. Engine Coolant Reservoir
  7. Windshield Washer Reservoir
  8. Fuse/Relay Boxes
  9. Battery
  10. Air Filter Housing
  11. Mass Air Flow Sensor (MAF) location
  12. Brake Fluid Reservoir
  13. Power Steering Reservoir
  14. Spark Plugs
  15. Distributor Cap

  1. Engine Oil Cap
  2. Engine Oil Dipstick
  3. Radiator
  4. Upper Radiator Hose
  5. Engine Coolant Reservoir
  6. Windshield Washer Reservoir
  7. Fuse/Relay Box
  8. Power Steering Fluid
  9. Spark Plugs
  10. Alternator
  11. Accessory Drive Belt

  1. Spark Plugs
  2. Distributor Cap
  3. Lower Radiator Hose (barely visible in photo)
  4. Battery
  5. Air Filter Housing
  6. Mass Air Flow (MAF) Sensor location
  7. Brake Fluid Reservoir
  8. Brake Booster
  9. Fuel Filter
  10. Fuse/Relay Box

Identification Aid
The above photographs with diagrams should help you locate the main parts and systems under the hood of your vehicle. If you have any questions about the outlined parts that are not answered in the relevant text or links, or need help identifying addition components, feel free to contact me.
Are there any parts you can identify that I left out? Let me know by leaving a comment!


Relevant Sites
Here is an external link to a site with information relevant to this article.

4 comments:

Anonymous,  December 23, 2009 at 2:34 AM  

Dont know how long ago you did this but its very helpful, thanks. What is the roundish part to the left of #9 on the third picture?

Adam,  November 26, 2011 at 1:02 PM  

Thanks Matt, We really appreciate you taking the time to explain and depict the location of the major parts in our Nissan 1999,1998 Altima.

Amartya Roy February 1, 2012 at 9:03 PM  

Matt where is the front O2 sensor on a 99 Nissan Altima GXE

Anonymous,  November 21, 2015 at 3:53 PM  

transmission dipstick and cap missing in all

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