Ran across a 2002 XJR, appx 82k miles. Ad says O2 sensor light on. Is this an expensive fix or can it indicate there may be other problems? I am new to Jaguars and just trying to learn all I can before buying an XJR. Thanks!

 

Well first off let me say Jaguars don't have an 02 sensor lite on the dash. Most likely the Check Engine Light is on and the the code was for an 02 sensor.
If the code is actually for an 02 sensor they are fairly easy to change and will probably run you a $100.00 to $150.00 each for the upper heated sensors and a little less for the downstream non heated sensors.
The prudent thing to do is to have a code reader and plug-in and pull the actual codes and then determine why the check engine light is on.

 

+1

Usually a seller fixes small stuff like that so as not to put buyers off, so question why this seller is different!

 

agreed, an O2 sensor fault isn't reason enough to sell the car!

As Vern says, a little OBD2 reader is the first tool you should buy if getting into these cars, many use the ELM327 with bluetooth or wifi and an OBD app on your phone can save thousands of dollars down the road when you diagnose faults for yourself.

Here is the code list for engines, it's for the AJ27 which is the same for a 2002 XJR.
You'll be looking for P0131 onwards for an O2 fault.

 

Indeed. You absolutely must scan any OBD equipped used car for codes. Even if it only registers one code for an O2 sensor, when you make an offer on a car like that you have to assume the worst, that the O2 sensor is fine, but rather there's a wiring problem or computer problem that's going to cost thousands to diagnose and fix. Otherwise, if its just a few hundred dollars repair, then the seller would have already fixed it. But in this day and age where the average American cannot cover a $400 emergency expense without going to a payday loan shark place, who knows, it may be steal of the century as long as the seller is willing to accept your risk-adjusted offer of just over salvage value.

 

Thanks for all the info everyone! I should have worded it better buy saying the engine light is on and is giving a code for an O2 sensor. I may try and give it a test drive this week.
Thanks again!