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Re: showing a engine service soon
The code that it is throwing is P0128, "Coolant Temp Below Thermostat Regulating Temp. If your car is not running hot try this. If it is running hot take it to the shop or replace your thermostat yourself this is probably the problem.
Simply disconnect your battery, turn on the headlight switch for about five to ten minutes, and re-connect the battery. This is pretty simple, but will likely result in you losing your radio presets and perhaps some other small things like that.
This will reset your light. If it comes back on your thermostat or temper sensor may be bad.
Good Luck Hope this helps>
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P0420 NISSAN - Catalytic Converter Efficiency Below Threshold Bank 1
The most common cause for the OBDII code P0420 on Nissan vehicles is the three way catalytic converter Bank 1 has reached the end of its useful life.. Since this is a very expensive part you need the code fully diagnosed as some other things like exhaust leaks or poor engine tune can cause it as well
P0128 is a code for engine temp below regulated temp. It usually sets when the t-stat goes bad and is either broken or stuck open. Either of which can happen on the sentra. Replace the t-stat (especially if you have noticed that your temp gauge has been reading a little low) and that should solve the problem.
you need to get the computer scanned and see what codes are present auto zone does it for free you cant pass an emission test with a check engine light on or right after you clear the codes it has to be driven and be in a ready status to pass hope this helps