My O2 Sensor problem

[TheHat]

So how about I am doing all this work on my 07 and discover that my O2 sensors has welded themselves to my cats. So the guys over at enjuku go threw all this crap to get them off only to find out that Nissan screwed them up so that when the came out not only where they cross threaded in there but what threads were left had melted away. Needless to say my O2s were worthless. We installed some new ones from and 06 that have worked just fine. Just figured I would let everyone know about my O2 problem so that maybe they can prepare themselves for the same possible problem.

[tdfyeoman]

I've had the same problem. Did you have to do anything to the new oxygen sensor you had to get it to connect properly? I just got Bosch o2 sensors and the connectors on it are the wrong size. Any idea of an o2 sensor which will fit right. Any insight would be great.

[TheHat]

the guys at enjuku took the 07 o2 sensors off and tossed them, then they took o2 sensors off of a 06 and wired them up to the orignial o2 sensor wireing. Never got the check engine light, if the check engine light is going to come on after replaceing the o2 sensors it will do it within the first 80 miles.

[NSRsheets]

That sucks. Good thing you got them fixed.

[cuffuup28]

Not cross threaded. New anti-tamper thread's called "X-thread". They make it so once it is screwed in, if ya take them out, you have to buy a new part. And where do most people go to get the new part...the dealer of course. The new part is a regestered emmisions part, so nissan wants to know why the part failed to quickly. Nissan sends out some inspectors from the dreaded DMV, to inspect the failed part. And what do the Inspectors find when they go to your house...an emmisions altered car, which in some states can be siezed if it is not a "Race only car" or "Track car". That's why if your gonna mess with the cat's, you'd better know how to do all the maintenance yourself, or take it to aftermarket place like TheHat did. Just another way "The Man" is trying to screw your fun!

[tdfyeoman]

I'll just get some o2 sensors from an 06 then splice the connectoin points seal it and stick it on. Same difference

[C-Kwik]

Not cross threaded. New anti-tamper thread's called "X-thread". They make it so once it is screwed in, if ya take them out, you have to buy a new part. And where do most people go to get the new part...the dealer of course. The new part is a regestered emmisions part, so nissan wants to know why the part failed to quickly. Nissan sends out some inspectors from the dreaded DMV, to inspect the failed part. And what do the Inspectors find when they go to your house...an emmisions altered car, which in some states can be siezed if it is not a "Race only car" or "Track car". That's why if your gonna mess with the cat's, you'd better know how to do all the maintenance yourself, or take it to aftermarket place like TheHat did. Just another way "The Man" is trying to screw your fun!

Do you have any sources to back this up. Seems highly unlikely to me. Especially, the notion that the DMV would actually go to someone's house...

I doubt the parts "welded" together. There is not enough heat in the exhaust to surpass the melting points of the metals used in exhaust components. Siezed maybe. A good penetrating oil and some time is a good solution for this. It's important not to force it loose until the oil has unsiezed the threads. Doing so can easily cause debris (usually from a small amount of surface corrosion) to build up between the threads which can ultimately rip out the threads when you try to unscrew it.

I would recommend the use of an anti-sieze compound on the threads of an O2 sensor when installing it.

[TheHat]

Yes so "welded" may not be the appropriate term but let me put it to you like this, when the guys at the shop were taking the o2 off they were useing liberal amounts of penetrating oil to pull them off and still were unable to salvage the part to use again. I am not sure what the technical term for it would be but when I saw the sensors myself they looked hella jacked.