GDonald386

I’m just in the process of installing the Berk metallic HFC’s on my G37S 6MT, which has turned out to be a little more challenging that initially perceived, in that everything is so tight and requiring a lot of muscle to break free! The area I am looking for input on are the after cat oxygen sensors one of which was so hard to remove that the threads “gauled-up” in the process, so now I am looking for a direct replacement. The one removed had the following numbers on it NTK 0ZA603-N5 and 7J11 above the main number. They are four wire type probes. Looking for input on replacements, which can be either OEM, or other manufacturers on the proviso they are better quality.
Thanks in anticipation of your input.
Regards,
GraemeD
(GDonald386@aol.com)

BerkTechnology

I've been through your same situation plenty of times installing them on the G37's. The problem is that Nissan/Infiniti did not use anti-seize on the threads from the factory and the steel used for the O2 sensor body is softer than the steel that they are threaded into. Hence, when you remove the O2's from your stock cats the threads will gall badly.

But... I've never had to replace a sensor. Take a thread file, a small skinny file, or a M18x1.5 die and clean those threads. Make sure you use anti-seize when reinstalling those sensors. When removing the O2 sensors from our HFC's, you will not run into the same problem, we are using a much higher grade steel (304) than what Nissan is using.

The O2 sensors on the HR motors now use a Ford/Delphi style plug IIRC. The O2 sensors from a 03-06 G35 will NOT work, they use a different plug made by Sumitomo. As of right now you can use a set of 07-up 350Z sensors, they are the same as what you have on your 2008 G37.

Hope that helps!

MaxToTheG37

iTrader: (3)

So Do you have to be real carful when taking out the O2 sensors?

BerkTechnology

Yes, be careful. But as I said, I've ran into this on almost every HR motor (350Z, G35 sedans, G37's), but I've yet to replace the sensors in the cats from FUBAR'ed threads.

GDonald386

First off thanks to the Berk technology chap, thought it was only me! There was no thread anit-seize at all! With both the CAT and 02 sensor being a soft austenitic steel they will gaul big time, which they did. Why people don't use high temperature anti-seize I will never know.Just goes to show the OEM doesn't know and do everyhting right!

In taking them out, just go back and to trying in terms of attempting to unscrew the unit to get some spray lubricant into the threads by whatever means possible. They do come out but it does not look pretty***

"Berks" right in using a thread file but it is still not an exact science when trying to then screw them into these new HFC cats without gauling up those threads up as well. So new sensors it is. So now the next question is where to get them from?
Appreciated,
GraemeD.

BerkTechnology

Any Nissan or Infiniti dealer. Or, have your local autoparts store order them for you. There are a number of aftermarket replacements, but just make sure you are getting an OEM replacement, not a "universal but it fits" replacement. You just don't want to be splicing wires or re-pinning connectors down there. Most of the 4 wire heated sensors are all the same, just the connectors are different.

Your local auto parts store should also have an M18x1.5 die as a loaner tool as well. Might as well give that a try before shelling out $250 for new sensors. Like I said, I've never had to replace those sensors before.

Hope that helps!

kaos2774

I had the same problem http://www.gtmotorsports.com/search....=search&page=1 79.00$ bosch Oxygen sensor

peterbanks

iTrader: (4)

Oh Yeah. Also of note, the top bolt on the drivers side is directly behind the steering column shaft. You have to use a short socket on this bolt, and it is safer to break this one free manually.

MaxToTheG37

iTrader: (3)

Maybe it would be a good idea to Post the part numbers that we would need if we mess one up?
How bout that? Seems like a good precautionary thing to do...

I guess the Auto Parts store part numbers one seeing how most of us dont want to pay Dealership prices...

ANYONE? BERK?

UNV-IT46

iTrader: (3)

good to know.