Good morning,

I am wondering if anyone else has had this problem?
I got a code of P1647 bank 2 upstream O2 and replaced it and cleared the code, then after about 3 miles the check engine light cam back on, and sure enough the same code reappeared.
Anu ideas of what it could be?

Thank you, Sean

 

 

 

The fuses for the 02 sensors are fuse 38 bank A and fuse 42 bank B in the engine compartment fuse box

 

I just measured the ohms on the old sensor and it is reading
0 ohms. Does anyone know if that shows that the sensor is good?

 

I checked the fuse which is F42 for bank 2 and the fuse is good.

 

First question is did you replace it with OEM or one of the troublesome eBay cheap ones?

Shade tree mechanic testing of O2 sensor =


Multimeter testing =

 

I am using a Denso sensor.
Do you know which terminal I should check for the voltage and ohms, as I do not have a manual.

Thank you.

 

 

Correct, I was just not sure which color wires in the terminal I am supposed to check the voltage and ohms on. On the upstream, sensor side am I supposed to check the ohms reading across the 2 black wires?

 

There are 4 wires on the upstream bank 2. 1 white, 1 blue and 2 black. Does anyone know on the sensor side which ones I am supposed to take the ohms reading on and which ones on the harness side that I am supposed to take the voltage reading on?

Thank you

 

You can check this by going to the "stickies" on the main page and downloading the workshop manual.

 

XTYPESEAN: This post has pdf wiring diagrams for our X-Types: https://www.jaguarforums.com/forum/x...4-25-a-152076/

Oxygen sensors are in Figure 03.1 - Engine Management System

Search for "H02 Sensor" (Jaguar's abbreviation for Heated Oxygen Sensor)

 

Ok update. I worked on it this weekend and I have ohms readings on both upstream sensors of 1.2 I have power going to Bank 2 upstream. I attached a test light across the heater circuit wires and turned on the ignition and the test light lit up for a few seconds and then turned off. I hooked up the scanner and it is showing no voltage fluctuation reading for both upstream sensors. Erase code and it comes right back. Has anyone had this problem before. I am at a loss! Any help would be much appreciated. Thank you

 

PROBLEM SOLVED! I spending hours testing, I ran across an article online talking of fake Denso O2 sensors, and sure enough The first one I purchased off Amazon was a fake. Bought a new one at a local parts store last night and problem gone.

 

See post#7 :-) :-) :-)

 

Got mine from Amazon, and it was advertised as a Denso, But goes to show even someone off amazon is scamming. lol

 

 

On the Lexus forum but still applies of how to spot a fake Denso sensor (no part number ON the sensor = real, WITH a part number = fake) =
https://www.clublexus.com/forums/ls-...-can-tell.html
The #4 about the lead wire is interesting. This might be a major reason so many eBay and Amazon clones cause problems.

https://www.ebay.com/gds/Oxygen-sens...9223532/g.html