My 7.3 diesel did not pass smog because of code p1396 what does this mean?...

It won't pass smog in California because the 1st thing a smog tech does it check for fault codes on the vehicle's computer with a scanner.

You will need to go to either a specialist auto electrician or a Kia dealership to find out what the problem is as any P1*** code is specific to the manufacturer so could be anything. Dealership usually means dealership prices but they have the correct information for each Kia car.

This is a wheel speed code If you did not get a second code it maybe the PCM if another code is present it could be the ABS module. There are other codes for each wheel sensor. good luck

Your code is a PO785 is a SHIFT TIMING SOLENOID BANK A wich is a transmission code nothing to do with your smog failure so go to your local auto store and buy this product it's called guaranteed to pass this will get u buy the bs emissions test for 10 bucks regards Chris

Just because the car seems to run well, does not mean the emissions are within spec. For example, you could be running a little rich and the car will start and run great, but the exhaust is not within code.
What you can do is take it to a "smog shop", that is a repair shop with the proper equipment to diagnose the problem. If the testing is simply the reading of the on board computer codes, then most any place can read those, but you need an experinced mech to know what to do about it. May need an exhaust gas analyzer to physically sample and analyse the gasses. For the actual test, as long as the computer says all is fine, usually, you're good to go.
If the computer looses power any saved run data will be lost and must be re-accumulated to pass the smog test. A few hours to a day is usually enough run time to accumulate enough data.

depends on what code it is displaying,won't pass if anything but a transmission code

two codes are for an oxygen sensor & the 452 for the evap system

Google OBD2 Systems followed by the code

that code means exhaust gas recirculation (EGR) valve closed position performance....in other words stuck closed...replace EGR valve.then it should pass will never pass otherwise....might cost @around 100 bucks but call around and check dealer some parts are cheaper at dealer. hope this helps

Evaporative Emission ( EVAP ) system fault

Not a solution: This is my problem...
I needed to get my car smogged, but the check engine light was on. Took to to a local smog station that had replaced a sensor for me in the past in order to pass smog. They could not fix it. Put car in dealership garage for repairs and to date, the transmission module sensor (computer) went out and the ignition sensor was out also. The mechanic replaced both and now the code P1702 comes up. What does that code mean? My car still won't pass smog....