I have 2003 2.1 V6 X Type.....Code PO1646 showing,is that O2 sensor? If so does it require immediate action? Where is it situated,and what sort of job is it to change? Thank-you

 

Here's the extract from the Jaguar DTC lookup for P1646:


(click on the image to enlarge it)

Members with the same model will advise location and difficulty.

My preference with a DTC once identified and noted is to clear it and see if it returns before throwing parts at the problem.

Graham

 

xtype62, must you replace it immediately and not drive the car with this code. No. Is the repair going to possibly be more expensive the longer you drive with the code locked in, most likely. So, now the question is how long do you want to drive with the code in risking hurting other parts of the car (specifically the catalytic converter). I would say to first start with replacing the affected O2 sensor and seeing what you have then. Replacing an O2 sensor isn't all that hard and if you know where to look, it isn't all that expensive either (I think I spent like $50 USD on an O2 sensor for my X-type). I spent another $20 on the special tool for removing the sensor (I highly recommend it as it works much better than the O2 sensor sockets).

If you need any more info, let me know. I can even include a few links as to where to find the sensors for cheap and what tool I am specifically talking about.

 

The bank 1 upstream sensor is located on the top of the exhaust at the side of the engine next to the passenger compartment. On the back wall you should see a black plug and a grey plug side by side. The grey plug is the upstream sensor. You can follow the cable back to the sensor. Take a look at the link below for some pictures of the plugs and their location. The pictures also show the sensor tool required for installation.
It is possible to remove the sensor without removing the intake manifold but you will probably also need a "crow's foot wrench" to break it free.

https://www.jaguarforums.com/forum/x...ensors-126530/

 

Once determined to replace it you may be able to get a normal ring spanner on it but would need to cut the connector off first.

 

Thanks...Is it easier to remove 1st bank upstream sensor from the underside of vehicle or from under the bonnet area?

 

The upstream sensor has to removed from the bonnet area. it sits on the exhaust manifold and is not visible from below. The visible sensor from beneath the vehicle is the downstream sensor.

 

Much easier from above. The big trick is you want to remove the vacuum line running to the brake booster out of the way. This will open up a hole from near the brake booster to the back side of the engine. This will give you room to stick your arm down in there and pull out the O2 sensor. It looks hard, but it isn't. The big trick is getting the correct tool to break the O2 sensor loose. After getting it loose, the rest is a piece of cake. This is where the correct tool can make it super simple or a real PITA.

 

Are the aftermarket sensors any good,such as available on Ebay for around £30? Thanks

 

xtype62, stick with a brand name (say Bosch or Denso) and get the sensor with the plug already done for you, then you will be fine. You get some off-name brand or you start having to do the wiring yourself (unless you understand wiring pretty well), the possibility of having issues with the new one go up greatly.

As for finding the part in your price range, should not be a big problem. Places like E-bay have a wide selection and should make finding what you want fairly easy. There are a few listings with the upstream sensor for $60 USD coming out of China. Should be about the same price for you in England.

 

Hi again...I can see two sensors from under the bonnet area,one appears vertical the other horizontal...Which is no.1 upstream sensor? Thanks for your help

 

In my previous post I put in a link with photo's. I'll put it in again down below. Follow the linnk to a forum thread with pictures of the connector for the upstream bank 1 sensor. Once you locate the plug on the firewall you can follow the wire to the correct sensor. It is a fairly short wire.

Go to this link:https://www.jaguarforums.com/forum/x...ensors-126530/

 

Check the placement of the wires, have seen O2 wires cut by heat shields.

 

Avern, if you look at a side of the motor, you will see where the catalytic converters are mounted pretty much to the side of the motor (integral part of the exhaust manifold). The sensor up near the motor is referred to as the upstream (or #1) sensor. The other is much lower on the motor and downstream of the catalytic converter. This is the downstream (or #2) sensor. Do not confuse the #1 and #2 sensors with Bank1 and Bank2. The Bank refers to the side of the engine, the # refers to whether it is near the exhaust ports or much further down the exhaust piping. You may also see the O2 sensors referred to as say 2/1. This would mean that the O2 sensor is on Bank 2, but is the upstream (#1) sensor.

Hope this helps.

 

Mmmmm Cannot shift that sensor,siezed in I guess Does that mean I will have to remove inlet manifold to get better grip on it?

 

Just ordered shorter sensor remover as mine is too long at 90mm Hope new ones 50mm and 30mm in length will do the trick...