O2 sensors?

[180sxDrifter]

thier are what i believe to be 3 O2 sensors on the header of my KA24DE and I can't get two of them off so I can put my new headers on.. anyone know what size wrench to use or what? we tried metric and standard & everything was eaither to big or too small

[TehWagon]

i know for my car you need a special 02 socket... try sears.

[180sxDrifter]

na i can get that normal O2 sensor out.. its these two other like lines that go to the headers no clue what they are lol im assuming thier O2 sensors but yea its not the one ur thinken of

[specVogel]

i dont know about that exact engine, but if there are lines running to the header they might be lines for an egr system. they should be metric.

[highmilehatch]

Make sure you spray the hell out of it with some penetrating solvent before trying to remove.

[silver05bullet]

definitely use crc solvent on them to loosen them up a bit, not really sure on the size if you dont have a wrench that works try using an adjustable one

[auk113]

ok on 240s there are 2 O2 and 1 EGr

headers have 1 O2 and
1 EGR tube that tube is ether a 23mm or a 27mm

[TehWagon]

egr? i thought it was egt? or am i being dense?

[awdlaserbeam]

egr is for emissions egt measures exhaust temperature

[Bryan]

If the engine is OBDI there is only one o2 sensor, the other two parts on the exhaust will be the AIV which should be below the o2 sensor I believe, and the EGR which will be closer to the top.

[glyph]

EGR - exhaust gas return this is the pipe that should come off the exhaust manifold back to the intake system
EGT - exhaust gas temperature - just what it sounds like, the temperature of the exhaust gases (not usually measured without aftermarket gauges)

Use an adjustable wrench. That's what I do.

[180sxDrifter]

lol they are stuck in, I had a guy at the shop try and do it and he tried everything i did and more, I have to cut them off and get new ones for it to work

[glyph]

Have you tried the PB blaster/break free products?

[180sxDrifter]

yes, and heating it up, trust me everything has been tried, professional advice was to cut it off and get new ones lol

[cburwell]

I used a 22MM open ended wrench on mine. I had one person pull/turn the heaer in on direction while I tuned the wrench in another. You can also use the O2 sensor socket, and a pipe on the end of the ratchet oth get some extra leverage.