There is a vacuum hose between the firewall and the back of the motor, it is formed with the 2 ends different diameters. The hose collapses when it is running which causes the engine to stall. I believe this is a dealer only item. Just replaced mine and the car runs fine now.
Take it to auto zone and have the codes read for free.
its just a vacuum hose probably. mine did it before too.
Autozone will not provide enough help.
Pull the codes from the computer, match the code to the troubleshooting procedure, follow the procedure to find the source. Repair the source, light will go out if that was the only problem. There are "monitors" or self tests the computer runs the car through a drive cycle, if a problem occurs, it may not run all of the self tests until that problem is taken care. Therefore, another problem may exist. It is emission related. OR hook up a scanner that is capable of clearing codes, and hope that none are still active.
Check that the Oxygen sensors are correctly installed and working. Also check with your Ford dealership to see if your car is one of many that needs a new FUEL pump. Ford has a TSB on this and will replace it for free... I have a 2003 Focus SVT with all the same problems.
could be a PCV Valve. My 01' Ford Escort with similar engine needed that recently. Appox 5 dollars easy fix.
My 2000 Focus wagon had the exact same problem and I could hear vacuum sucking in the engine compartment. In the end it was two failures at once: 1) the PCV hose failure like everyone else, and 2) a broken white plastic vacuum cap on the intake manifold.
Some folks have luck simply replacing the odd-sized PCV hose with the Ford replacement, but I was not so lucky. In my case both ends of the PCV line (under the intake manifold and connected to the PCV valve) were bust. So, to replace the entire assembly I did the following:
I bought a "PCV elbow" (by Help! auto parts), hose clamps, 3 feet of 7/16" fuel line, and a replacement PCV valve all from Pep Boys. I bought a 1/2" brass hose connector from Lowe's. I connected the elbow to the fuel line with the brass connector and secured the PCV valve in the other end of the fuel line with a hose clamp. I removed the old hoses and PCV valve and replaced them with the new rig. I had to route the new hose around the engine block, but there was plenty of room.
I still had vacuum leaking and a really rough idle after replacing the PCV line. I found the source of the leak by using a length of hose as a stethoscope. It was a rotten, white plastic cap on the intake manifold. I bought a set of rubber vacuum plugs (by Help! auto parts) from Pep Boys and one was a perfect fit.
After both of these fixes the idle was back to where it was a couple of years ago. Good luck!
the vaccume hose is broken and is over heating you need to replace it for only $500:if nothing has helped so far, check your egr valve as it probably just needs a good cleanin'. egr stands for exhaust gas recirculation and is usually located between the exhaust manifold and the intake manifold. it gives metered, pre-heated air from the exhaust to the carburetor and generally has carbon deposits on it. it sounds like yours has an abundance of carbon in the passage causing the car to die when your approaching a stop sign or something.
Use a code reader to find out why the check engine light is on.
The check engine light is a " picture " of an engine , just to the left of the engine temperature gauge
The check engine light on a 2002 Ford Focus can be reset by disconnecting the battery for 1 to 2 minutes. This resets the vehicle's computer and clears the light.
Then you need to have code checked, you can diagnose from there.
Sounds like a sensor issue, I would check the temperature sensor for the ECM as a possibility or get the car scanned to see what the sensors are doing. If the check engine light is on there will be stored codes to give you direction.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
it might be your throttle
The light comes on when the car stalls because the engine is not running and the pump therefore is not pumping. The pressure will always be 0 when the engine stalls and the light is directly related to pressure. This is normal, you have no problem, other than the engine stalling.
Have vehicle scanned to determine the problem
Check Engine light is on. Engine OK when cold, but when reaches operating temperature it stalls at idle.
is the computer setting a code or check engine light, if not it could be your crank sensor.
It comes on when the engine computer detects a malfunction and sets a code.