1991 jagur xj6 just had a check engine light just came on. its not OBD2 so how do I get the code to fix it

You need to find out what code or codes are stored in the PCM/ECM - engine computer , before you know what to fix ! Check Engine Light On read about OBD2 - onboard diagnostics an sensors etc...

Under dashboard near the pedals.

Do you have any obd2 scanner ? you can use them to check the engine system.

if the problem has been fixed it may work...check engine light useually indicates a sensor has failed..

You have an OBD1 System

Just like the current OBD2 1996 thru 2011,
you have to check for codes,then diagnose
your fault codes

P0001 Fuel Volume Regulator Control Circuit/Open The above code is about an oxygen sensor code for the heater circuit located in bank 1 sensor 1. (bank 1 is at exhaust manifold by the #1 cylinder head, bank 2 is on the 2nd cylinder head. On some engines, both exhaust manifolds could have one oxygen sensor each side and the 2nd cylinder head will have the sensor 2). On the oxygen sensor itself, it has 4 wires which are color coded. Two of wires are for the heater circuit that heats the oxygen sensor to make it reach optimum operation quickly. Those 2 oxygen sensor heater wires could be shorted between the sensor and the ecm (engine computer) or other engine components.
The common fix for this code is to check the integrity of the heater wires. Check the wires for insulation and routing which could be loose or touching a hot exhaust that can short the wires. If the engine has too many miles, it is possible that the heater circuit inside is worn and shorted which needs a replacement of the oxygen sensor. If you have a DVOM, you can also test the continuity of the heater wires from the oxygen sensor to your computer pins.
More detailed fixes will be provided as soon as you give the symptoms of the obd2 trouble code. ATS will provide the wiring diagram so you can trace the color coded wires. Use an obd2 code reader or scanner so you can access this obd2 trouble code. When you have this obd2 code list, use it as a reference and give the code to ATS. We will then send you all the possible fixes for the obd2 trouble code. ATS has lots of fixes for obd2 gm codes, obd2 ford codes, dodge obd2 codes and all obd2 import codes such as Toyota obd2 codes, Honda obd2 codes, Nissan obd2 codes, etc. All fixes for this obd2 codes are guaranteed or your money back.
Important TIPS about Oxygen sensor:
The oxygen sensor content of the exhaust gas indicates when the engine mixture is operating lean or rich. When the oxygen sensor detects that the engine is operating rich, the signal voltage is high, and any decreases in the signal voltage means the engine running is lean. The engine computer supplies a reference voltage like one volt or five volts, and then shows the change in the sensor return voltage as the sensor's resistance is changing. If you have connected everything properly, when you crank the engine, you should see the check engine light coming out.
Unheated oxygen sensors rely on the heat of the exhaust gases to reach the working temperature, therefore they might start to cool down while the engine is idling and revert back to a default air-fuel ratio setting. This type of sensor usually has a single wire connector, though others have two. Unlike the fuel pump relay, the 02 sensor heater circuits have a separate fuse for each sensor and grounds, which are controlled by the engine computer.
To read a voltage across the heater, one side must be connected to (+) and one side must be connected to (-), which is accomplished by the computer or a transistor. It can read 12V between each wire and a separate ground if it was connected to positive and the other was not yet connected to ground connection (for details, please contact ATS).after you replace oxygen sensor you have to drive for so many miles before it resets its sef

TO RESET ECM ON A 1988 XJ6 JAGUAR.YOU DISCONNECT NEGATIVE BATTERY CABLE FOR 30 SECONDS TO CLEAR CODE.THIS WONT DO ANY GOOD IF YOU HAVE A ECM TROUBLE CODE DONT FIX PROBLEM.CHECK ENGINE LIGHT WILL STAY ON, UNTIL YOU FIX FAULTY COMPONENT OR SENSOR.

Sorry this one doesn't have a good answer. After 1996 cars use what's called OBD2 (on board diagnostic version 2) This allows anybody to use a handheld scanner to test any car for "check engine" light. But before 1996 each manufacturer had their own OBD. So only the dealer could check it or you would have to buy a specific scanner for Fords only. I have a OBD2 scanner. You might ask your local autoparts store what they have to read your code. Otherwise you have to take to dealer or mechanic that has the right scanner. I wish you well.

the check engine comes on when a code is sent to the computer, if you dont fix the problem for the code being sent, it will not reset... you need to have the problem fixed first... then after the problem the shop can erase the code. or you can goto any autozone, pepboys, ETC. and pick up an OBD reader,the port for it should be under the driverside dash, it is normally there and might be covered by a cap. you connect it up to the computer there and read the codes, then you can clear them, after the problems are fixed.... the obd reader is not that expensive, you can pick them up for about 30 to 50 dollars depending on what you need to do, and there are ones that are very expensive also that will do everything except drive the car for you.... but as i said do not just reset the light cause you may think it is one thing, or something you replaced or fixed, but the light comes on for more then just that, there could be 1 code, or like 10 codes... you can get the code reader )OBD2) from Ebay also.... hope this helps you out....

The PAO you see on your dash in the VCM (Vehicle Condition Monitor) *is really* -PAD-.

I had the same beacon on my 1991 XJ6, it refers to the brake pads being worn.

Fuse 3 is a notice that there is a misbehaving fuse in your 3rd fuse box, which is located inside the center console (armrest)

Best of Luck!
JeremyM