I RECENTLY PURCHASE A 2OOO INFINITI I30 .MY MEHCANIC SAID I NEEDED NEW PLUGS AND REAR /FRONT OXYGEN SENSORS OR O-2 SENSORS.IS THERE ANYHING MORE I NEED TO DO HELP IT PASS EMISSIONS AND RUN BETTER THAT IS INEXPENSIVE.ALSO DOES IT MATTER WHAT BRAND I USE

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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I would recommend simply purchasing an adapter with 2 USB ports on it. This way, you have 2 USB ports but it you need to plug in some other device, such as a portable air compressor or an electric torch, you still can do so by unplugging the USB port adapter.

code p 0134 refers to heated oxygen sensor(HO2S) 1 bank 1--no activity detected ===causes ---wiring open circuit--heating inoperative---HO2S sensor
it also refers to oxygen sensor (O2S) 1 bank 1 --no activity===causes wiring -- oxygen sensor
HEATED oxygen sensors are in the exhaust manifold or exhaust pipe before the cat converter
oxygen sensors are in the exhaust pipe after the cat converter
bank one is the side closest to the radiator on a cross fitted engine or on the lhs with you facing the fan

99 infiniti i30 brake lights not working - Nissan Forum ' Nissan ...

forums.nicoclub.com/99-infiniti-i30-brake-lights-not-working-t599143....
Apr 13, 2015 - hi, so my rear stop lights stopped working recently. but the brake light inside the rear window above the trunk works fine. that makes me ...
images for 1999 infiniti i30 wiring

You return it and buy the correct one to fit your car

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.

On the SOHC engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the front catalytic converter. On the DOHC engine the front oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the catalytic converter.

Oxygen sensor location-Baja 2.5L SOHC engine


Oxygen sensor location-Baja 2.5L DOHC engine



On the 2.0L engine the front (A/F) oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the rear catalytic converter. On the 2.2L engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the rear catalytic converter.

Oxygen sensor location-Impreza 1998-2001 2.2L engine



Oxygen sensor location-Impreza 1998-2002 2.5L SOHC engine

I hope helped with this; remember rated this help. Good luck.

Sensor 2(s) are those aft of the catalytic converter(s).
The pre-cat sensors typically fail more frequently than those post-cat.
The codes you cite are related to all sensors.
It is worth running a test of the sensors. Most garages can do the tests without any disassembly and for less than the cost of replacing any one of the four. Then you can replace the faulty unit with confidence.

it under intake goood luck