My 98 infiniti i30 did not pass smog due to code P14448. How do i fix this to pass smog

Question edited for clarity and toss in some CAPS.

There is nothing that backs up memory. When you disconnect the battery, all memory is lost, which is why it is important not to do it!

You don't tell us the model? Is it a secret? All questions need 'year make model' as the FIRST 3 words.

If your have a 1999 Infinity I30, the ECM Fuse is Fuse 58.

58 10 Engine Control Module (ECCS), Mass Air Flow Sensor, Crankshaft Position Sensor, Idle Air Control Valve (IACV-ACC) Solenoid Valve, Ignition Coils, EGR, EGR Volume Control Valve, EVAP Control System Pressure Sensor

Infiniti i30 (A32; 1995-1999) fuses and relays

Fuse Box Diagrams https://fuse-box.info > infiniti > infiniti-i30-a32-1995-...

Fuse box diagrams (location and assignment of electrical fuses and relays) Infiniti i30 (A32; 1995, 1996, 1997, 1998, 1999).

Infiniti i30, i35 (A33; 1998-2004) fuses and relays

Fuse Box Diagrams https://fuse-box.info > infiniti > infiniti-i30-i35-a33-1...

Fuse box diagrams (location and assignment of electrical fuses and relays) Infiniti i30 / i35 (A33; 1998, 1999, 2000, 2001, 2002, 2003, 2004).

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Help in the link

P0720 2000 INFINITI I30 Code Vehicle Speed Sensor

https://www.autocodes.com > p0720_2000_infiniti_i30
Diagnostic trouble code is detected when Transmission Control Module (TCM) does not receive the proper voltage signal from the sensor. 'What are P0720 2000 ...
Missing: miss ‎' Must include: miss

More here

https://www.google.com/search?q=2000+infiniti+I30+miss+shifting+code+P0720

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What to check when I am not getting power to all the coils of my 2005 Infiniti G35?

YOU NEED TO HAVE VECHICLE CODE SCAN FOR FREE AT ANY AUTO PARTS STORE THEY WILL GIVE YOU THE CODE THAT CAUSING CHECK ENGINE LIGHT TO FLASH.ITS MORE LIKELY EVAP LEAK THAT WILL CAUSE YOU TO FAIL SMOG TEST.

As you have probably discovered, the diagram isn't included in the
Owner's Manual (http://www.downloadcarmanuals.com/1997-infiniti-i30-owners-manual-download) or even the service manual (Infiniti I30 and I35 Factory Service Manuals NICOclub).
It looks like the layout is the same as the Maxima from that era:



The 1998 layout is the same, although I'm not sure whether the actual lid/door will fit-
98 1998 Infiniti I30 Gray Fuse Block Cover Lid Door Panel Bezel OEM M88...

98 1998 Infiniti I30 Fuse Block Cover Lid Door Panel Bezel OEM 68964 eBay

The first code could be due to a shift solenoid in the transmission. you can have a transmission shop use a scanner to observe the shift patterns while driving it, some will do free diagnostics if you shop around. the second code is for your oxygen sensor, you will need to replace it because if bad it can cause the engine computer to make the car run lean or rich and will make it fail said smog tests. the sensor the code is referring to is your upper sensor, if it is a v6 model it will be on the passenger side upper or if it is a 4 cylinder model it will be the only upper sensor.

It usually takes about 20 miles or 30 minutes to reset enough of the self tests to complete a smog cert.

I’m happy to assist further over the phone at https://www.6ya.com/expert/gregg_78ecbb34e27be215

You would probably fall into the Euro 3 category based off a few principles.
1. Year
2. Weight
3. Emissions (most important)

If you have an e-check site in your state you should be able to see the emissions from them and figure which category you fall into. Until you test the actual car there in no definitive way to tell.
Only because a car made in 2000 may pass the Euro (3) 2000 standars and also be suited to pass the 2005 Euro 4 standard. its hard to say until the car is tested. it may not even pass the euro 3 standard of 2000 even though it was new in 2000 due to the fact it was a US made car for the US and not Europe.
Good luck, and hope this helps
NGK