hi im new here im having issues with my nissan trying to get feed back i was having a hard time turning on my car it made loud crank noise at starting so i replaced the starter nothing happen it still wont turn on i replaced the camshaft sensor nothing i put in a new ignition sensor and still nothing it feel like the engine is locked but the car is well maintained with it oils it did have service engine soon light the code i got is p0420 but im cluesless of wat it means has any one had the same issaue please help me out thanks

 

P0420 is for a bad rear pre-cat. If you look at this link, in the second picture you will see the exhaust system. The part in question which P0420 is referring to is the piece labeled "front exhaust tube assembly" which has the rear precat built into it. However, P0420 will not cause starting issues with your car. It mainly is a silly annoyance.

 

the noise on the video u shared is not the same as i had my car made a noise as i tried turning it on not while it was runing i apreciate the video though ...

 

im gonna try a post a pic im what my engine looks like and a video of the noise it makes as i atry to start my car ...

 

It might make some really bad noises if that precat is completely clogged and no letting any exhaust through because you'd have massive back pressure on the rear-3 cylinders.

 

? Was not sharing that link for a video in it, was only referencing the picture in it so you would know what part you are dealing with.

 

oh ok i see thank you im a fenale and new to wat im doing here just learning ..

 

Have you checked ge battery, and altenator, all the times my Max didnt start in my 5 plus years with 3 Maximas always was dead battery, the ztarter or altenator, never had no issues witb sensors so far(knocks on wood) GL....

 

Hmm well in most cases that code would not keep the car from starting, I think you might be dealing with multiple issues here. Not quite clear on if you're car is actually starting or not, from what I gathered starting with difficulty, but it might help to get a recording of the noise it is making if you can.

 

ok guys so to shed some light on this p0420 problem. I had the p0420 problem for the last 7 months Ive owned the maxima. I had to pass inspection so the problem needed to be fixed. It was the precats. That is also the reason for the rattle that the 02 maxima is so notorious for.

 

Hi Damaris, first off, welcome to the org!
I was thinking that since you're new and you don't really know what's going on, you might want to say what your location is and see if anyone local might be able to come by and help you diagnose a little better. Most everyone is quite helpful. You can post what this person told you, and it might be a lot easier to go from there. Just sayin'!

Oh, and if that isn't possible, try to post a video yourself. It will make it much easier for everyone to help you diagnose the problem.