Anyone know of a good source for the titanium type O2 sensor?
Also, anyone know how to confirm the correct part number?
My old one has "NTK A4F" stamped on it.
Not sure if that no.# is correct for my 740, L4, 8 valve, no turbo.
Thanks, Rudy.
Over and out......................

Thanks, to all who responded.
I purchased one(O2) from "www.sparkplugs.com"(NGK-$120.85).
However, the new one did not fix my ruff idle, intermitent miss, and high-rpm-surge off of TB-idle-switch-click.
It(O2 sensor) did have 200k mi. on it and it sounded like a bean bag when shaken(something loose inside).
So now I am looking at injectors and ground connections again.
Wonder if anyone has seen similar simptoms?

Regards, Rudy.
Over...................

Curiosity asks "what indications say it's gone bad?"

I did a lot of research on this myself, talked to a lot of guys even the people of NGK.

I have a 91 Rex system 740
Best place is to just order it from NGK's website at www.sparkplugs.com. ITs 120 there. Don't get a universal one because it will not have the titania construction most likely and you will have to splice in the wires as well. I believe it is model 25063. Feel free to email them on their site though they email right back sometimes within the minute!


tbone

I think there is a Walker available at oxysensors.com(?) for about $95 (splice in) or $125 for the long lead (OE style) version.

Ther's been a lot of BrickBoard buzz on this recently. Do a search on titania (not titanium)
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.

Oxygen Sensor (made in Japan) Heated 3 wire Volvo part #3517394 $156.00 net at dealer
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1990 740GL Wagon 235k AW70L B230F 8 Valve Non-Turbo Rex/Regina Non-EGR R-12