P1647 Linear O2 Sensor Control Chip (Bank 2)

My car threw this code about two weeks ago and it runs decently and has not been getting bad fuel economy. I can't see or am having a stupid moment and can't see where the wiring for the left hand side upper sensor wire goes to. I wanted to check the connection and wiring and then see about replacing the sensor if it all checks out.

Where does it go, and if I replace the sensor, how in world do I get a wrench or socket on it?

ANy comments or suggestions are greatly appreciated. I searched and couldn't find much on this fault code or anything on the replacement process of the upstream O2 sensor.

 

I think you can reach the upstream 02 sensor from the top of the engine, may have to remove the air pipe and vacuum lines, not to mention the engine cover. If you don't have tiny hands, you may have trouble. Swap bank 1 for bank 2, see if the code follows the relocated sensor to troubleshoot the sensor is the issue.

 

When I swapped my cats out, I had to transfer the O2 sensors. They were seriously siezed and I broke two O2 sockets on them. I think it would have been even harder to get them out with the cats in the car.

If you do need to take the cats out, here are my instructions. The instructions also indicate where the connectors are (they are hard to reach also, BTW). Enjoy

 

All 4 O2 sensor connectors are supposed to be latched on holders at the top of the trans bellhousing, along with the trans connector. The code is for the O2 sensor heater for the LH upstream sensor. The connector will have two gold terminals and two silver terminals. Check the resistance of the heater using the two silver terminals and compare the resistance to the one on the RH bank. If they are not really close to the came figure, it's toast.

Cheers,

 

I had one of mine go a couple of years ago 2001 XKR at 48K miles. I ended up changing them all bought the Bosch ones from Amazon for $65-75 lower/uppers. Jag dealers sell them for $605/each !!!!

All 4 on the XKR 2001 are heated with the black or grey connectors. I seem to remember the bosch website had the wrong ones for XKR but right ones for XJR i.e all heated.

Yes you need to take out the Cat Converters theres just not enough space + they tend to be really tight (theres a TSB for this problem). While you have the Cats out change the Transmission oil and elec connectors as you have easy access once the cats are removed. Oil + filter Amazon again $30 filers + elec connector + $60 for tranny oil

The O2 sensors are the following Bosch 15626/15627 these are listed on the Bosch web site (for the XJsupercharged) and have the correct plugs. Note top and bottom are heated ones in that years model. Hardest part of taking O2 sensors out is getting to the plugs and undoing the four nuts at the top where it connects to the manifold.

15626 = $66
http://www.amazon.com/s/ref=nb_sb_no...sensor&x=0&y=0
15627 = $61 on Amazon.
http://www.amazon.com/s/ref=nb_sb_no...sensor&x=0&y=0

Remember alot of aftermarket products are better than Jaguar parts as technology in the last 10 yrs has come along way. Its always worth shopping around as things like fluids can be found with big discounts and no sales tax on places like Amazon or eBay.

Good luck!!

 

Thanks all. I have time this weekend to do this. It runs and drives fine, so I'm going to finish the head gaskets on my Corvette and then do this, this weekend.

I'll post up the details and resolution.

 

Is bank two the sensor on the drivers side down below the coolant tank before the cat?

 

Yes, that is the Bank 2 upstream oxygen sensor.

Cheers,

 

ok thanks. The car never got that code till I soaked the motor with water cleaning it, dumb yes, then multi rad fluid spills on it fixing octo hoses, so I am ganna check the connections on it first then replace I guess. I did a lot of yanking and pulling on that octo hose replacing it, maybe I did something to the connector for that one that is on the back side of motor in the area of the octo hoses.

 

I pulled the offending upstream bank connection and sprayed contact cleaner in it, blew both ends out, plugged back in, cleared code with my TORQUE phone app, CEL is now gone where before the sec I turned the car on the code was there.

 

Keep in mind, 02 sensors / emissions usually take 2-3 driving cycles to register. I'm not sure if the cycle is mile dependent or time.

 

it came back today, ganna replace that one. arrrg.

 

I was able to replace that one without removing the cat. Borrowed a open end wrench head that had a 3/8 sq. drive hole. I was set to use the torch but it came out easily.
The hardest part was the plug connection and fishing the new one through. Tie a piece of string to the sensor and pull it out by the plug end, then use the string to lead the new sensor in. A open end wrench will tighten it sufficiently.

 

Don't know if this helps,I usually cut off the wiring harness flush at the tip of the 02 sensor itself,and then sawzaw off the sensor flush to its nut.

Then remove the nut with my new clearance. I had a car where I had to use a torch and heat the socket cherry red before the Nut/part of sensor came out.

There was a member on here that found a secret access panel for the O2 sensor, and one that made his own access by doing something , been a while, so I forgot.

 

Are the upstream ones on my 03 the same, meaning you can put this one I found

on either side upstream? The wires on it are the same color as mine also.

This one is identical to mine, the first one listed, the bosch for 78.63. Will it work on the left (drivers?) side upstream?
http://www.partsgeek.com/catalog/200...en_sensor.html

 

I replaced my LH upstream (drivers side) o2 last night as I had the code for it. Cleared the code with my Torque app and drove it around for 20 minutes or so last night with no check light. Get in it this morning and BOOM the check light is on again right at start up. I did not have my stuff to test it but ganna have to assume that is my issue again/still as that is my only code I was getting other than the p1000. What the hell. I already cleaned the connectors with electrical contact cleaner. This car gets tiresome at times. Arrrrrg

 

I have had this code for 10 months. I replaced the sensor and cleared the codes and the light always comes back with the same code. I have given up as it doesnt affect the running of the car.

 

It does affect the running of the car. The ECM increases the richness of the fuel mixture and could damage the catalyst.

 

Heed RJ's comments above. Either you obtained the wrong sensor, the O2 Heater relay failed, the fuse blew or there is a wiring fault to one or more O2 Sensor Heaters. Bear in mind, if the heater relay fails for instance, the ECM will set a fault for the first sensor it fails a test for. Once that code is set, it will NEVER look for any other like faults. Meaning once it knows the O2 system has a heater fault, it quits looking for heater faults. That's why the failed relay example will not result in codes for all four sensors.

Cheers,

 

Interesting. How do you go about checking the wiring for faults then? Get a multimeter to the wiring connection at the sensor end?