gferren

In the process of replacing upstream and downstream O2 sensors on 1999 Jeep Grand Cherokee Laredo 4.0L, not CA emissions. Does anyone know which NTK sensors this would be ? I've come up with NTK 23506 (upstream) and NTK 23088 (downstream).

Ralph77

I was scoping out things and it is definitely not clear.
At least to me.
I think you need to measure your pigtails and go from there.

gferren

Yes, I measured them but still not sure about my choices... will keep looking for info before I commit to ordering the O2 sensors. What I have seen so far is that NTK/NGK is the better O2 sensor brand.

Ralph77

With my '00 XJ it is all you run. I am going with that a 99 WJ would follow suit.
My problem was when I first looked them up I came up with a different part number for the upstream.
NTK 23122

https://www.napaonline.com/en/p/NGO2...ut=o2+sneosrts

The downstream one is what I came up with.
The problem started when I Googled the upstream part number you came up with.

https://shop.advanceautoparts.com/p/...506/20474402-P

At the top is says this:

for your 1999 Jeep Grand Cherokee LaredoDirect Fit Oxygen Sensor; Upstream; B1S1; Calif. Emissions; 11.5" Pigtail; OE MFR: NTKDirect Fit Oxygen Sensor; Upstream; B1S1; Federal Emissions; OE MFR: NTK; Cyls. 4-6; B2S1; Calif. Emissions

But at the bottom of that page it says this:

1999 Jeep Grand Cherokee Laredo (4.0L 242CI L6 FI VIN: S)

• Direct Fit Oxygen Sensor; Upstream; B1S1; Calif. Emissions; 11.5" Pigtail; OE MFR: NTK

2000 Jeep Cherokee (4.0L 242CI L6 FI VIN: S)

• Direct Fit Oxygen Sensor; Upstream; B1S1; Federal Emissions; OE MFR: NTK; Cyls. 4-6; B2S1; Calif. Emissions

So it looks like that upstream one is only for a '00 XJ with Federal Emissions or a '99 WJ with CA Emissions.

But I don't want to give you the wrong info.
If I had to pick a site to trust I would go with the Napa one but I am kinda biased cause I work there. LOL.
Not that this helps, cause I replaced all 4 O2 sensors in my '00 XJ with CA Emissions, but out of the 4 I had to buy
two were the same part number for a Federal Emissions '00 XJ.

gferren

I came up with 23122 upstream, looks like it works for both CA emissions and Federal emissions (10.5 pigtail), and 23088 downstream... ordered the removal tool and re-threading stuff too. These links helped ...https://ngksparkplugs.com/en/part-finder and https://www.ngk.com/NGK-Automotive-Parts-l1411.aspx
Thanks for the comments on this.
btw, there is a NTK/NTG parts catalog out there somewhere, but best I could find for it was a paid subscription site... pay for access to view the .pdf file. partsgeek also lists their O2 sensors under the NTG label and I did not see a conversion for those part numbers, but one could chose from the O2 sensors descriptions I suspect.

gferren

I came up with 23122 upstream, looks like it works for both CA emissions and Federal emissions (10.5 pigtail), and 23088 downstream... ordered the removal tool and re-threading stuff too. These links helped ...https://ngksparkplugs.com/en/part-finder and https://www.ngk.com/NGK-Automotive-Parts-l1411.aspx
Thanks for the comments on this.
btw, there is a NTK/NTG parts catalog out there somewhere, but best I could find for it was a paid subscription site... pay for access to view the .pdf file. partsgeek also lists their O2 sensors under the NTG label and I did not see a conversion for those part numbers, but one could chose from the O2 sensors descriptions I suspect.