Question about 2001 Ford Focus

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Engine light Changed the air filter. Forgot to plug the air sensor back . Engine light turned on steady . Car is running fine once I plugged it back in but engine light is still there . How do you reset ?

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Hi,

Try removing any of the battery cables for at least 15 minutes. Pls be warned though that this will reset the vehicle's computer and would require driving around several times before the computer learns again your driving habits. Additionally, there are some car stereos that would require a code to work again when the battery cable is removed.

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.

Thank you for using FixYa.

Posted on Jul 19, 2008

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have a pressure test done on the fuel manifold to check for pump-regulator pressure and filter performance. You state that the filter was last changed in 2007 so it is well past it's blocked up date .. Run fault codes . replace the canister . Have a compression test done as the engine is getting long in the tooth and may need refreshing .. Check that the cat converter is still operational as they will block up the exhaust system and cause poor performance

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My 98 Century was running fine without any known problems. I decided to have the spark plugs, Air and Fuel filter replaced. Had originally intended to also replace spark plug wires, but had to leave that...


See the attached video for instructions on how to test the wires and coils. If that isn't the problem then it is likely the ignition module, or the crank or cam position sensor.

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Just had my oil changed and now I have a service engine soon light that will not go out


Most likely the air flow sensor was left of the intake hose going from the air filter housing to the air intake of your motor. Also the light may come on if the sensor was released while the key was turned on but the engine was turned off. If you can take a look under your hood and look for the air filter housing. Once you find it follow the Large air hose that goes into the motor. On this hose there should be a sensor plug in for the air flow sensor wire. If there is nothing plugged into try to locate the wire and plug it in. Once you have it plugged in or if it was plugged in try disconnecting your positive battery cable for about 10 minutes to reset the check engine light. Be careful when disconnecting the battery not to touch any metal with the end of your wrench or ratchet. Hope this works for you..

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93 volvo 850 glt changed the fuel pump now car wont start. Engine cranks, fuel pump working, fuel getting to the motor but it wont start. The car had trouble starting sometimes so i changed the fuel...


Check your fuel pressure to ensure proper pressure to the block, also did you replace the fuel filter.

On a side note: 3 things a automobile needs to run

AIR-make sure you have a clean air filter and your MAF (mass air flow sensor is plugged in) if you pulled your breather to innspect anything, there is a possibility that it came unplugged or you unpluged it and forgot to hook it back up, a car wont start without it being plugged in if equiped

SPARK-Make sure your car has juice to the plugs, if the plug doesnt fire the car wont run, if you have to pull each plug and ground them to the engine block to see if they arch. If not trace the problem down (if you changed the fuel pump you have some mechanical skill and should be able to troubleshoot a spark issue)

FUEL-Check for proper pressure, dirty fuel filter(s) and if your system has a return line, make sure your hoses didnt get crossed cause this will damage the engine and regulator.

Hope this helps Thanks for using Fixya.com

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VSC TRAC, TRAC OFF, and CHECK ENGINE lights


The VSC TRAC and TRAC OFF lights come on everytime the CHECK ENGINE light comes on. I think you just need to get the light reset.

Brian
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I would unhook your mass airflow sensor and drive the car if it runs better unhooked then it is confirmed that you have a bad mass airflow sensor. then you can replace it. also make sure you hooked up your plug wires correctly. hope this helps!!!

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1990 camry will not start


this is just a shot in the dark, but wiggle the wires on the top of the air filter canister...i had this same problem (though i never got in to check if the engine plugs) after I changed the air filter.

I had started to take that sensor off bove the air filter because i thought i had to, turns out i didn't need to do that. I put the air filter in, and my car wouldn't start...I unscrewed and screwed back in the tiny screws that hold that plug into the top of the airbox sensor thing (no idea what it's called)...and wiggled it around and it started fine again.

I will not change my air filter again!!

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Change the IAC the idle air control. You may be able to clean it and put it back on.

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