Questions on Some I30 Maintenance

[miccris93]

So I've had my I30 for about 6 months and I love the car. However, now that my Service Engine Soon light has come on, I ended up looking into more things. I'm just curious on two areas that I can't really seems to find answers on.

1. My SES light came on for code P0158. I know that it means Heated Oxygen Sensor 2, Bank 2. Is this sensor located before or after the catalytic converter? Now, also, I've read that there is an ECM update that should be applied. Is this absolutely necessary for the new sensor to work or should it be optional?

2. I was skimming through Technical Service Bulletins and saw three for the Transmission. Typically in my car, it will refuse to shift even at high RPMs unless it is perfectly warmed up. And even if it is cold still, the transmission will flare/slip, and this is mentioned in one of the TSBs (ITB00028A). And sometimes even if warmed up, the transmission will shift, but not fully settle into gear on one single action. There is no harshness otherwise, except for the first few shifts after sitting overnight in cold New Jersey weather. Looking around, I found a kit to replace a solenoid that my friend (automotive-inclined) said looks to fix this. The part number for that is 31940-80X25. Has anyone used that kit and seen any positive changes? Or would it be better to go to the dealer and ask what Infiniti issued as a fix for the TSB?

Thanks for any help anyone mentions with these!

[maxhopper]

1. bank 2 sensor2 should be the second sensor in line from the cylinder head nearest the radiator. Sensor 1 should be just below the exhaust manifold, and sensor 2 should be in the y-pipe before the cat.

2. I'd call the dealership and see what they have to say about the TSB.

[miccris93]

Thanks! I ended up getting the sensor from the dealership so now I just have to have it put in. My friend tried today by jacking the car up, but he said some heat shield was in the way and he couldn't get to the sensor. Will have to go to my dad's friend's garage on Monday to put it up on the lift. And regarding the transmission, a mechanic while I was at the dealer suggested that I service the transmission and flush it since even though there are only 31k miles on it (yes, original) the fluid probably thickened up after 12 years.

[loystock]

My 99 I30 (CA-Config) has similar exhaust layout as yours and I have replaced that sensor w/o any problem. It would be better to have an O2 Sensor Adapter (modified socket, @ $10) to prevent damage to the cable during removal/installation. Below is a link to get a better understanding of the O2 sensor layout.

post6227563.html?hilit=o2%20sensors#p6227563

The solenoid valve you mentioned can be bought on line for @ $80 (OEM, discounted price). However, I agree that a flush is due if you still have original fluid. Recommended fluid is Nissan Matic-D but Dexron III or the newer and better Dexron VI will do the job. You can add LubeGard Red (not Black) ATF Protectant after the flush.

[Towncivilian]

ITB00-028A has been superseded. See ITB00-028b - 2000-01 I30 A/T SLIPS FROM FIRST TO SECOND OR SECOND TO THIRD GEAR.