Whats is code FF23 on a 94 xjs - XJS Jaguar Cars & Trucks

A good chance that your car does NOT have one. OBDll was not required by law until 1996.
Some manufacturers had there own systems before then.
I found the following web reference:

"Sorry fellas, the 1989 XJS has no onboard diagnostics at all. It only has a red feedback monitor hookup [with a blanking cap] back near the fueling ECU in the boot. It was used for mixture setup and that's pretty much it.
The trip computer fault code readout didn't arrive until 1992."
The trip commuter readout he refers was a way to get codes (after certain steps taken) to show up in the trip computer display.
For OBDll compliant cars .... the port has to be within 3 feet of the driver with full access .... usually under the dash
Helpful?

Jaguar Sensor, XJ6, XJ8, XJS, XK8, S-TYPE, X-TYPE, XJ40 ...

www.jagbits.com/jaguarsensor.php
FITS: 1993-1994 6.0 XJ12 AND 1989-1993 V12 XJS FROM VIN 157118 ON, 1994-1996 6.0 V12 XJS FRONT DAMPER .... LNA1622AA - MAP SENSOR ... C42166-USED - USED SENSOR COOLANT TEMPERATURE FOR FUEL INJECTION

images for coolant temp sensor 89 xjs v 12 jagua

Jaguar XJS Coolant Temperature Sensor - YouTube

? 5:39
www.youtube.com/watch?v=awd2f3HL7N4
Jun 15, 2014 - Uploaded by Abe Caleb
Working on the Jag and bringing it back from bad mechanics that have bad skills. If you do not know how to ...

Thread: 6.0 V12 XJS High RPM When Warm - Jaguar Forum.co.uk

www.jaguarforum.com/showthread.php?t=54266
Mar 3, 2013 - I recently bought a 1993 6.0 V12 XJS and when it is started from cold it runs ... to 1300 RPM so it wants to surge forward when braking which is strange. ...Classics · XJS 3.6,4.0,5.3 & 6.0; 6.0 V12 XJS High RPM When Warm ... You might want to adjust the aux (extra) air valve to bring the idle speed down.

I would start with a tune up, then isolate any symptoms other than lack of power if it persists, like rough idle, sputtering, jerking, engine trouble codes, etc.

Hard to find repair info. on this vehicle,here's a repair manual,then you will have it so when something is wrong,you can find out in your book.I have one to all my vehicles.http://www.ebay.com/sch/i.html;jsessionid=39061EBCC63678877FE6A7BF784BF05E?_fspt=1&LH_CAds=&_udlo=&_sadis=&_sop=&_sacat=&satitle=88+jaquar+xjs+repair+manual&_fpos=&_mPrRngCbx=1&_udhi=&_nkw=88+jaguar+xjs+repair+manual&_nkwusc=88+jaquar+xjs+repair+manual&_rdc=1

the engine computer needs to be reset we had the same problem with our xjs our mechanic reset the computer to fix it

hey go to this website they have all the stuff for jags, their in houston,texas and i have used them to order parts for my 85 and 79 jags :p

http://www.motorcarsltd.com/

if this helped, please rate me or what ever! :p

fuel pump

hi mate cet the number for gmf car spares they will help general motor factors