Hi, I have Nissan sentra 2002 gxe. After how many miles should i give the car in service? Which kind of service should I ask for? Thanks

Have someone check the exhaust back pressure.

What fits you car is on the white label inside the door
on the A or B pillar.

A tire store will have a listing also

good day Sir, your nissan sentra 1999 gxe have a timing chain this is some tips for your routine maintenance.
Replace engine oil
Replace engine oil filter i

it has a timing chain, no service is needed for a chain.

Here is a diagram of the 1.8 exhaust from the service manual, you can obtain a full factory service manual for relatively cheap from Promanuals.net here.

You will need a new catalytic convertor assembly. Yours is below treshold efficiency in other words its "no good".If you have it replaced, ask the garage/dealer to give you the old one back. Its worth some cash if its full. It doesn't matter thet it failed. They are going after the mesh inside of it and that is worth some $$$$. May not be much , but better than nothing.

SERVICE IT .....OIL PLUGS, AIR ,FUEL AND OIL FILTERS GET TROTTLE SENCOR AND THE MASS AIR FLOW SENCOR CHECKED

buy a used unit from the junk yard.

when you pulled the trunk down on the firnature it could have set the latch without it being shut look inside where the latch is put your key in the trunk lock and turn it, using you finger or somethin smaller you should be able to pull the latch back out and the trunk should close

Check for vaccume leaks and also you PCV valve. check the hose too. Visually inspect every vaccume hose you can find. Sounds like a leak .