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As for your codes p1131 and 1151: Ford - Lack Of Heated Oxygen Sensor Bank 1 Sensor 1 Switches - Sensor Indicates Lean
Last week I had the very same catalyst, evap and ECG codes come up on my 1999 Mercury Mystique which is like a Ford Taurus. A friend was able to find a hole or leak in the hose connected, replaced it and it runs fine. I havent run it a full and straight 50 miles yet to clear the check engine light but that repair alone changed the entire way the car was poorly driving. Im sure that hasnt fixed all the probs but thats a good starting point.
When "check engine" turn on, one or more fault codes are stored in the PCM; I suggest scanned the PCM (computer) to know exactly what fault codes there. With this code numbers go back and could send you additional details.
Flashing CEL is an indication of a misfire. You would need a code scanner to find out which cylinder it is. The code should be a P030n where n= 1 to 8 ( the cylinder number ). Could be a P0300, which is a misfire indication.
The check engine light will represent fault codes that the computer is sensing. Have a mechanic, or go to your local auto parts superstore and have them scan for the fault codes. This will at least give you an idea about some of your problems.
Go to auto zone tell them your check engine light is on and that you need to have it checked. they will go out hook a little hand held computer to a connecter under your dash and it will give them a code. They will then look the code up and tell you the problem. It takes about 10 min and its free
The check engine light is not for maintenance related notifications, it is for indicating emissions and drivetrain malfunctions. There are literally hundreds of causes for the light to illuminate on a modern vehicle, and you will need to take it to a repair shop or an auto parts store to have the diagnostic codes scanned to get an idea of what is wrong. Most auto parts stores do this for free. They also sell diagnostic scanners so you can do it yourself. The range of problems can go from as simple as a loose gas cap to major transmission internal failures, etc, so it is best not to just guess at it. If the light is lit solid, the vehicle is in most cases safe to drive until you can get the problem diagnosed; however if the light is flashing, you should shut the car off and have it towed. A flashing check engine light indicates a misfire so severe that it could cause catastrophic damage.