Does anyone know whether or not a 1989 Dakota, V-6 came with an oxygen sensor or not? I can't find any sign of one having been on my truck. There is no port in the exhaust pipe for one anywhere that I can see.


If an oxygen sensor was there once upon a time and a PO removed it for whatever reason, wouldn't I constantly get "check engine" messages popping up? I'm not getting any message to that effect.


Thank you for any help.

 

I see a part number for one. You don't have a check engine light on?

 

No the check engine light dos not come on. However, it does come on initially at start up to indicate that it is working

 

is yours fuel injected or carburated? I know what it should be, but......

 

It has a Holley throttle body. Don't even know if that was original or not It is definitely not multi port as there is no fuel rail.

 

What's puzzling to me is that I have a 1st generation Dakota Shop Manual but according to it, I shouldn't have single port fuel injection in a 3.9 V-6. They contend that single port was only available in the 2.5L 4 cylinder. It's a mystery

 

Well, since the 1988 used two injectors in the throttle body (provided by Holley for Chrysler Corp), then technically you won't have single port injection ...

Yes, there's an O2. It's on the Y pipe, and scanted up towards the passenger side from the Y joint on my 1988 (which used the same Y pipe part number as the 1989). There's only one, though.

My exhaust shop had to drill and weld on a bung for my replacement - the old one had self-welded over 27 years and over 280,000 miles (!!) when I finally got around to replacing it.

RwP

 

Thank you for your comments. On the driver's side of the Y pipe there is a tab welded to the pipe that I thought was where the O2 sensor would go but there was no hole in the pipe. Could it have "healed" over and stopped itself up?

 

no it would be a leak every time the engine ran

 

By "self-weld" I meant the threads of the O2 had welded to the bung, so it wasn't coming out.

Mine is on the passenger side in front of the "Y". If I get under the truck in a day or two, I'll take a pic of the old one and the new one both.

Or you could trace the wiring from the harness down to the pipe, that'd work also.

RwP