Mystery upstream O2 sensor, what does yours look like?

Talkin about a 1998 2.4L auto trans, base model DLX Taco. I'm trying to remedy a P0420 code and pretty certain that it's the upstream sensor.

So I ordered a new Denso O2 sensor from Rockauto, who I've had great experience with. This one here: http://www.rockauto.com/catalog/moreinfo.php?pk=991722&cc=1317613&jnid=474&jpid=8

This one looks like the downstream, but not the upstream sensor on my truck. I called RockAuto and the rep was pretty surprised at my issue. It's a commonly ordered part and he couldn't find a return because of this problem in the order history of the part.

My upstream sensor looks like this: http://www.rockauto.com/catalog/moreinfo.php?pk=1514872&cc=1317613&jnid=474&jpid=14 Has anyone else ordered this part for their truck?

This is contrary to what RockAuto database says, even after giving them my VIN, but the upstream on my truck definitely looks like this, where the whole sensor screws into the exhaust, not with a flange that is held in with two small bolts.

I wanted to see if there are other Taco owners that have run into this and see if there are other Tacos out there with the same O2 sensor arrangement. This one costs $30 more than the Denso, so I'd like some assurance that someone else has been here before.

Thanks!

 

I did this same mistake. I ordered my first, upstream, from Amazon. It turned out I ordered the downstream one. The upstream sensor has shorter connecter wires than the downstream.

Luckily, my downstream went out shortly after my upstream one did so I saved it and installed the downstream sensor.

After ordering the wrong part, I learned to just go to a parts store (AutoZone, O'Reilly's, etc.) and just get them to search and hand you a receipt for the part. Yeah it might be a little more at the parts store, but I would rather do it right the first time in my opinion.

 

I didn't make a mistake though, saundern. I ordered the part that according to Rockauto most Tacomas use for the upstream sensor, but mine is different. I don't see any evidence that the pipe has been replaced recently. I'm trying to see if there are other Tacomas out there that have this same pre-cat sensor or if mine is an anomaly.

 

Ahh, I see what you're saying. Sorry about that.

 

Possible someone replaced the upstream port because of rust or broken bolts. Does the pipe look factory, maybe someone used an aftermarket front pipe?

 

My 03 2.7 5spd 4x4 upstream is an afr sensor, not o2 sensor. Ive replaced both of them on mine, mine was the 2 bolt thing.

 

I figured out what part I needed. I got a Bosch O2 sensor for $90 from Auto Zone, replaced it and now my truck is accelerating and performing better. I guess some Tacos have a different pre-cat sensor than others.

 

On the old 95-97 Tacos they were the same part numbers so I doubt a picture of mine would help.

 

are you sure you weren't looking at the manual tranny one? they are different and since you chose a brand that doesn't specify what it fits or if it was upstream or downstream o2 sensor, well that's where you made your mistake.

with rockauto.com you should always choose from the selections marked by red hearts, these parts are confirmed to fit and be the right parts, anything else they are not assuring you it will work, only that the part manufacturer lists it as fitting your vehicle.

too late now but here is a better factory OEM one at half the price

DENSO 234-4154 Oxygen Sensor

and its $48 at rockauto.com

always go with denso brand if you want factory OEM replacement parts, they don't say Toyota but they supply all the factory parts Toyota puts on their trucks

 

Clearly, you didn't read this thread very closely