My car have the dreaded P1647 o2 sensor code and just planning to change out the sensor seeing it has about 96k miles on it.

Now I just need to find what is the brand or part number for the o2 sensor. Wondering is it Denso or Bosch will be suffice enough? Reason I didn't just go to autozone to pick up a Bosch unit is because few years back from Ford automotive forum Bosch o2 sensor leave a bit to be desire in performance application. Thanks for all the input.

 

Here's a British supplier, (they ship worldwide). Item 6 on the pic on the page.

Jaguar S-Type, X350 Lambda / Oxygen Sensor Front Upstream (C2C29250) | JustJagsUK.com=

 

From about a full day of search for future reference the OEM of the sensor is Denso and on many of the new 3.0 and 4.2 NA and SC car the part number is Denso 234-9030. Amazon have the current best price on them and I'm gonna buy a pair and switch it out and will compared the 2.

This explain why my MPG drop few months after I bought the car and I've always thought it's the blend of the gas up in Michigan here and the ECU/PCM adapts to it. Then after a few read on the forum and my thought always conflicted with fact posted by other. Then I formulated a second thought that at the mileage I have and thinking the sensor has lost it's efficeincy and always been wanting to change it out. Now it's the best time for me to prove my theory.

Got the code finally from using the ELM27 or whatever that call using the Android Torque program procuring the code P1647 and trying to see the o2 sensor and it said can't log because of open loop due to insuffiecent o2 temp or something, then from forum search about the the P1647 I then come up with my conclusion.

Will update once I fix it(or not fix???) on the later date once everything is done.

 

New O2 sensor arrive today and will change it out tommorrow and will update the result in terms of performance and fuel consumption. Do I need to reset the PCM/ECU for it to relearn or the PCM/ECU will adapt to it and relearn itself with the new sensor? Thanks.