Hi my car is nissan sentra 98 se eng.2.0 has check engine light and p0400 code I need engine vacuum hose diagram where can I find it ? thanks

You should be able to find vacuum hose routing sticker in the engine compartment.
http://www.nissanpartsdeal.com/parts-list/2001-nissan-frontier/engine-control-vacuum-piping.html?Diagram=223_A001

Parts found for 1988 Nissan Sentra Engine Electrical Engine Control Vacuum...
there are a few different diagrams as there were different engines in 98 sentras, it has picture diagrams of each.

please be more clear. Which Vacuum Hose Diagram you are looking for. What is the problem you are facing . Please elaborate so I can help you further.

P0400 (EGR flow malfunction), P1333 Make sure about this code its a chevy code so you will need to recheck,If anything the EGR is stuck open.Or you are dealing with a vacuum leak causing rough idle

Hi Michael: here you have two diagrams...






DTC P0440 code indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
A code P0440 could mean one or more of the following has happened:

• The gas cap is not installed or working properly
• The purge solenoid has failed
• The canister is plugged and not working properly

Additional details could find in this links Fault Codes on Cars & Trucks or other diagrams in Cars & Trucks Vacuum Diagram.

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Hi. Thanks for your question. For any assistance on Nissan cylinder you can visit https://www.reliable-store.com and download the entire workshop manual which includes all the information along with the diagrams for better understanding. Good day!

I would check that spark plug, and have that coil checked or replaced. Also check for any vacuum hose leaks in the area of the cylinder.

Most cases you'll need a scanner to do this.
Most autoparts stores will do this for you for free. Places like Autozone or Kragen Autoparts.

P0400 is auxillary emmisions control and P0500 is vehicle speed idle speed control auxiliary inputs.

there is an EGR vacuum solenoid somwhere that controls on/off vacuum to actuate the valve. i am not to sure of the location, but follow the vacuum line back from the egr until you find a device that looks like an electrical check valve for vacuum. that is a possibilty. but then again i am a ford,chrysler guy and am just giving you an answer based on my understanding of the functuality of a vacuum egr system