2003 Ford Focus check engine light isn't working

SOURCE: Check Engine Light

Go to a mechanic and check out the car, in some cars you need to take it to a mechanic several miles. you have have to worry about, but dont take risks, and go check out your car.

SOURCE: crankcase capacity for 2003 ford focus 2.0 liter split port engine

Hi,

To my knowledge, a 2003 Ford Focus 2.0 SPi engine would need 4 quarts of engine oil (roughly 3.78 liters). Incidentally, the Ford/Cosworth Zeta/Zetec engine would be needing 4.25 quarts (~4 liters).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

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SOURCE: Ford Focus Engine Light

Start by getting either a mechanic or someone with an OBDII scanner to read the code so you know where to start. Lots of time a loose gas cap will cause a "Evap system small leak" code which illuminates the check engine light for a while. Other than that I can't help you much without knowing what code comes up.

SOURCE: 2003 Ford Focus ZXT

Oxygen sensors do go bad, but having the code there doesn't necessarily mean a bad sensor.

In your case P2195 means your front oxygen sensor (on the exhaust manifold) read a lean mixture for more than 25 seconds on 2 consecutive drive cycles (2 times you turned your engine on, then off).

Ford does have a service bulletin out for that code and the code usually indicates you have a vacuum leak somewhere around the engine.

If your car drives well, I wouldn't worry about it right now. It's not a condition that will leave you stranded in any way, the worst that can happen is decreased fuel mileage.

I'd run the car for a while and see if the light comes back on, and if it does, how often. It may never light up again. If it does light up, and/or if you notice any increased fuel consumption, erratic idle (engine feels like it wants to stall at idle), or any other driveability issue, i'd start by looking for a vacuum leak before anything else...

Other possible causes could be
-Bad Oxygen sensor (possible, but i wouldn't jump to this)
-Bad injector(s) (unlikely, you'd probably notice in the way the engine runs)
-Fuel pressure issues (you'd notice this too)
-Bad engine computer (very unlikely)

A vacuum leak can a lot of times be pin pointed easily:
Start the engine and let it idle. Get a propane torch (the kind used to solder plumbing pipes) and open the gas valve slightly (without lighting the torch). Pass the torch around vacuum lines and connections (they run from the intake/throttle body to the transmission, brake booster, PCV valve etc...) When the torch comes around where the leak is, the engine speed will increase noticeably.

There are pumps available to check for this but I find this method to be quite easier, cheaper and more reliable.

SOURCE: Where is the O2 Sensor located on 2003 Ford Focus?

The code will tell you which O2 sensor it is.
The code will point to either bank 1 sensor 1; bank 1 sensor 2; bank 2 sensor 1; bank 2 sensor 2.

From what I remember with a focus, it should only have 2 sensors, sensor 1 will be located before the cat, and sensor 2 will be located after the cat.

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