Hello All,

About to purchase a 2004 X-Type from a co-worker and want to fix the P1647 CEL before taking possession. I know the code is for the Upstream bank 2 O2 sensor and I found these on Amazon -Denso 234-9029 Air Fuel Ratio Sensor and Denso 234-9016 Oxygen Sensor (Air and Fuel Ratio Sensor). Is there a difference between them besides the $40 price difference?

Any help is appreciated.

Thanks,
GMWebster

 

The 9019 is a downstream unheated sensor and will not work in the upstream position. Downstream is a 2 wire and upstream is a 4 wire.

 

both the upstream and down stream sensors are four wire. two wires for the heater and two for the sensor. the sensors have different color plus for up and down stream and keyed to prevent you pluging the wrong one into the loom.

 

I have the P1647 upstream sensor ecl code, I did replace with generic of ebay but still have error, I know I now have to get right one with grey plug and four wires but the jag parts are expensive, this is a mondeo in the engine bay a 2.1l v6 isn't there a compatible ford part??

 

While there are many mechanical similarities between the Mondeo and the small-engined X-type, the electrics and control systems are not the same. The Jaguar ECU is designed to work with Denso sensors.
While Denso sensors come with a grey plug on the upstream sensor and a black plug on the downstream sensor, this is not always the same for other makes. Even though the upstream and downstream plugs are differently keyed, they can still be made to plug into the wrong connectors with little force.
It is possible for a fault in the ecu to produce a P1647 code with a good sensor. Swapping the two sensors on either bank of the V6 will show whether it is the senosr or ECU which is at fault.
Hope this helps.

 

thanks kepla I was thinking with the number of sensors out there this might be the case, I have ordered one more from Ebay :
JAGUAR X-TYPE 2.0 2.5 3.0 V6 XK XK8 XKR 4.0 4.2 LAMBDA OXYGEN SENSOR UPSTREAM | eBay
although mine is suposed to be a 2006 the 2005 is the only 2.1L v6 fwd I can find so I am hoping I have not ordered another failure but time will tell I guess.
thanks for the input very useful

 

Okay, WayneinAus, no problem.
On the face of it, the new one you have purchased on e-bay looks like it would be correct. If you look at the picture of the plug you will see one keying notch on the left of the picture. A downsream sensor would have two notches instead. As far as I know, most of the Jaguar models around the age of our cars used the same spec O2 sensors. One thing I have noticed about the original Denso sensors is that they are too long to fit properly in some of the socket tools you can get - the ones which look like a spark plug socket with a slot (for the wire) in the side.
Do you have a decent OBDII diagnostic tool ? Once the new O2 sensor is fitted, you could use it to monitor the fuel trims to check that the system is now working correctly.
Good luck.

 

Did you erase the code and the check engine light came back on or did you just replace the part and the check engine light stayed on? If it was the latter, you might just need to drive the car more times and the light will go out on its own.