Resetting the Trouble Code after making a repair?

The tire size depends on which of the three models you have. The base model came with P175/70R13, the SE model came with P175/65R14, and the SE-R came with P195/55R15. Check the sticker on the drivers side door jamb and/or owners manual.

if you have done the gasket on valve cover then not tightend enough
valve rubbers will make smoke blue also the piston rings

We have two Nissan 200sx's, a 1995 manual and a 1996 auto. Both had this problem and both turned out to be the same thing. The "idle air control valve." It was most noticeable if you ran the air conditioner and then came up to a red light. You would have to keep pushing on the brake and race the engine a little to keep it from shutting off. Replaced that part and both cars have never had the problem again.

Turbo is not boosting

I have this talk with my customers almost daily

first things first... figure out how much you spent on this car over the past year and then divide this total by 12
this is the dollar amount you spent month on your vehicle
next compare this to the cost of a "new" car and the monthly payment you will have to make PLUS full coverage insurance
anything less than new isn't worth talking about because that stuff will just brake too and you have no idea what has or hasn't been done in its lifetime

assuming you can't fix things like this yourself, you also may consider leasing

Other thing to try; Clean your MAF, IAC and throttle plate.

http://www.2carpros.com/car_repair_information/year/1997/make/nissan/model/200sx/1997_nissan_200sx_drive_belt_routing_diagram.htm

Generaly o2 code comes up when anything at all is wrong in the combustion process. I'd have the egr valve tested and cleaned as well as the passages to and from it...They often get plugged up with carbon.

cORRECT. tHIS CODE DOES DEALs With emmissions. P1400 deals with the EGR valve. In case u are not aware, EGR stands for Exhaust Gas Re-circulation. What really this valve does is that it re-cycles some of the exhaust gases into the cylinder for combustion. The EGR valve might be blocked or has malfunctioned. It is advised that this valve changed or consult with a mechanic who is knowledgeable about this technology. a malfunctioned/dis-abled EGR system will cause the car to fail an emissions test, and may cause the EGR passages in the cylinder head and intake manifold to become blocked with carbon deposits, necessitating extensive engine disassembly for cleaning. So it is advised that u repair this ASAP

http://www.2carpros.com/car_repair_information/year/1997/make/nissan/model/200sx/1997_nissan_200sx_drive_belt_routing_diagram.htm