I have error code 1647 on my 3.0 x type,the problem is that there is so much conflicting views as to which sensor this is! upstream,downstream,bank 1,bank 2,sensor 1,sensor 2,Aaaaaaaaaaaaargh. Does anyone out there have a definitive answer? thanks.

 

Welcome brothel to the forum.

I moved your question over here to the X Type section for better exposer.

Please go to "New Member" section and introduce yourself per forum protocol.

Also if you would use the "User CP" located in upper left corner of any site page and add your vehicle details ie.. year, model, engine etc...

Thank you and enjoy all the site has to offer!

 

After replacing ALL the oxygen sensors, and still getting code 1647, I must have a vac leak. Can anyone point me to the location of the most likely culprits? Thanks folks.

 

If no one points you to a suspected place (but maybe even if they do...) a good way to test to see if a leak is there is to get a can of starter fluid and spray the suspected spot liberally. If there is a leak some of the fluid will get sucked in and the engine will speed up momentarily. If there is no leak the starter fluid will just evaporate leaving nothing to clean. This will, at least, confirm the existence of a leak and then you can start trying to figure out how to fix it... ;-)
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Jaguar: Grace, Pace, and Space - Sir William Lyons

 

Brothellash-
You meant P1647 correct
Concerns with HO2S2/1 (heated oxygen sensor left side #2 sensor rear)bank1
Heater failure
circuit shorted to ground
circuit shorted to high voltage(signal not reaching PCM)
circuit open (wire broke,connection ect)
Bad PCM or connection
P1 verses PO means it's model specific
The H means it's heated
Heated should be the rear one
So It's Heated 02, sensor 2 (rear)bank 1
there should be a collector where the exhaust pipes meet thats where it is by the thermostat pipe. The connector is under the battery box by the head light, there's two of them there.
As for where the problem started it's hard to tell,vac leak,connection,if it isn't fixed it will come back.

 

I have checked for a vac leak,and nothing.Therefore im guessing its a wiring fault.

 

Here goes, I changed all oxygen sensors, checked for vac leaks and had all relevant wiring checked over. And still got the same code! So back to basics. I cleared the code then unplugged each sensor in turn, until I came to the sensor that was throwing up the same code. I tested this sensor with a meter,and everything was fine. Now,being an expert at removing these little suckers, I decided to whip it out and have a visual inspection. Ten minutes later, nothing. Out of sheer desperation I ran to the dealership and got another, fitted the little devil,cleared the code, took the car for a few runs, a few days later and no dash light,no codes. GO FIGURE. Just one last point,the sensor I got from the dealership is made by Denso.