I'm getting four different fault codes for my 2000 infiniti i30. I have canceled all the codes several times but they always come back within a month or two. The i30 runs fine in every respect. The codes are po138,139,158,159. There are two oxygen sensors responsible for these codes. Should I replace them. My cheap code reader tells me their Bank 1 sensor 2 and bank 2 sensor 2, but which ones are those? Thanks Jeff

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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is the noise going overtop of even your radio? how long has it been doing this? when you turn the steering wheel right or left does it go away?
from just your above issue it sounds like a wheel bearing is going on your vehicle but would need more information to be precise.

Quiero saber donde queda el filtro de gasolina de un infiniti I30 modelo 2000

This is common issue with Infiniti I30 1999-2001.

When the coil packs fail they burn up components/parts on the engine computer ECU. If the problem gets worse, you will need to replace the ECU or have it rebuilt.

Is your check engine light on?
You might also get code P0505
Technical bulletin also recommends to replace
The Idle Air Control Valve MUST be replaced prior to re-installation of the ECM, or immediate damage to the computer will occur again.

http://www.myairbags.com/product/ecu-infiniti-i30-2000-2001
Common Failures:

• No Start, Hard Start, Engine Stalls
• Rough Idle, High Idle, or Idle Up and Down
• Misfire to one or more cylinders
• No signal to the ignition coils
• Engine Trouble Codes For Idle Control Valve (IACV)
• No Communication With Computer
• Replacing IAC Does Not Fix The Problem

Hi:
You most likely have an intermittent stalk mounted switch on your steering column. The same turn signal lever lets you flash your brights, also can make your lights flicker and act up if its bad, so It would be a good place to start looking for the problem.

NO ITS JUST A POWER SERGE THE WILL HAPPEN TO AVOID THAT TAKE THE BATTERY GROUND OFF NEXT TIME BEFORE REPLACING THE FUSE ;IF THE FUSE BLOW AFTER THE GROND IS BACK ON CHECK THE RADIO POWER SOURCE THERE COULD BE A SHORT SOME WHERE

what is a full tune considered for a 1997 infinity with a 115,000 on it

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

timming chain not belt . its a really big job i suggest the dealer.to much work and u need a lift to do the job!