For a free check on your code,go to Autozone and they will scan your code for free and it only takes a minute and they will tell you what's wrong.When was the last time you had your oil changed.You can take it to the Nissan Dealership for a oil change and they will see the check engine light on and run a free scan and tell you what is wrong and how much it will cost.They always check customer's vehicle's out to see if it need's anything.
SOURCE: 2003 Nissan Altima 2.5S, Check Engine Light Problem.
this problem could be caused by the mass air flow censor, i had the same problem with my car. it is really pricey at the dealer so you might want to check elsewhere for this part. I found one at a scrap yard for 85% less that the dealer and i also got life time warranty, the dealer does not offer any warranty on this part.
SOURCE: where is my fuel filter 2001 nissan altima
Most of the time there is an inlet screen/filter in fuel tank attached to fuel pump. But there should be another filter between tank and fuel rail. it should be located on the firewall, so if you work backward from an injector toward the gas tank you will bump right in to the filter along the way.
SOURCE: i have an 03 nissan altima engine makes loud clicking noise
1st check the the oil level and the vehicle's oil type.(owners manuel) 5w30-10w30
10w 30 is a thicker oil and could possibly be causing this.(Moves more freely through the engine heats the oil)
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