Question about 2000 Ford Focus
Mechanic told me the connection to the mass air flow sensor had come loose and he reconnected it again. It was surging a lot. Now the engine light is on again but the car is not surging and is running normal.
Only one way; it's to have it scanned again to see why the light is on.
Posted on Jun 10, 2014
I tried everything to resolve this same problem. I went to Autozone autoparts and O'Reilly's autoparts and had them connect their computer gaget to read the codes on my Taurus computer to see what was causing the engine light to be on. They both told me I had a possible bad sensor that It was one out of four sensors that was probably the problem. They could not tell me which of the four sensors was bad. I tried gas additives that i purchased at the auto parts to try to clean up which ever sensor was malfuncting. Nothing worked. then one day a local grocery store was having a purchase gas card and get eleven cents off purchase price. I had never purchased gas there but couldn't pass up the eleven cent discount. This gasoline had 10% ethanol in it. after i purchased two fill ups at that grocery store gas station, my engine light turned off. I continued to purchase gas there til the eleven cent promotion was over. I then start to purchase gas at my usual gas station. the engine light came back on the next day. this engine light had been off for several months while i was purchasing gas at the grocery store gas station. on my next fill up i purchased it from the grocery store gas station at their regular price....the engine light turned off an hour later. apparently the additive in the gas cleaned my sensor. my engine light has been off because i purchase my gas at the grocery store gas station. you might want to purchase your gas perhaps at Shell or Exxon and add the engine additive that is an option at the pump.try it for at least a couple of fill ups and see what happens. Good luck.
Posted on Jun 03, 2014
Is it the same code.
Posted on May 28, 2014
You'll need to get the Check Engine Light (CEL) checked. You can probably do this for FREE at an auto parts store. Call around and see which ones will test for free. This will give you the 'code' for the light. Reply back here or call the mechanic and ask 'Why do I still have a CEL?' Don't pay to fix the same issue.
Posted on May 26, 2014
Then probably the check engine light is because of something else, and could be a number of things. Heck it could even be a badly screwed gas cap, since it keeps the tank air tight and newer cars like yours test what they call the EVAP system and will turn on the check engine light if it finds even a very small leak. On my car right now i have a check engine on because the filler neck is rusted and so the gas cap doesn't seal correctly just so you know how far this can go. So if you really want to get the light off, you will need to have to codes pulled out of the computer to see what the problem is this time and fix it. Sorry if this isn't exactly a precise answer, but the check engine light is only there to let you know there is something out of wack, be it big or small, important or not, and there are close to about 1000 different codes that can be given by the computer that will light up the check engine, so without any codes, all we can do is poke in the dark until we find the target, so you will definetly need to get a scanner plugged in the OBD plug to get the codes out and find out what's wrong. That doesnt mean you HAVE to get it fixed on the spot though, most garages will charge a small fee just to get the codes out and give them to you if you want to fix it yourself. So just go to a garage you trust, or a good friend which also happens to be a mechanic with a scanner and have the codes checked. After that, feel free to write me up and i'll help you fix the problem. Hope this helps :)
Posted on May 24, 2014
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Posted on Jan 02, 2017
i will try to help. 171/174 indicates lean condition in engine. the mass air flow sensor is located in the rubber tube going to throttlebody. you can try to clean it. using mild carb cleaner safe for sensors, remove sensor from tube. spray clean the tiny wires located in the cylinder. do not touch them, they are very delicate. these engines are also notorious for leaking intake gaskets and faulty pcv valves. these will all set these 2 codes. feel free with anymore questions.
Posted on Nov 15, 2008
Yes, that sounds correct to be calibrated.and probably is what is causing your problem. Mass air flow sensors hardly ever go bad. They get dirty and set a code. Garages will try to sell you one when you can clean it with a throttle body cleaner. If you have your old one, clean it and put it back on, try it to see if it works better.
Posted on Jan 07, 2009
SOURCE: check engine light
It might but what exactly are the codes. Before you change the Mass air flow sensor, try cleaning it first with a can of mass flow cleaner.
If your running a oil K&N filter, there could be some oil residue on the sensor. Start with that and change the filter or clean it if it's a K&N.
The O2 sensor's could be bad also, you really need the code's to be sure what sensor is giving you the faulty signal.
Good luck and hope this helps.
Posted on May 05, 2009
try pulling off the air breather hose and look inside at the mass air flow sensor,it looks like a wire with a diode hooked to it incase you didnt know,see if there is any fuzz on it,sometimes the air filter will lose small pieces and the mass air flow sensor catches it.If that doesnt work then you may have a fuel problem,weak pressure,causing the mass air flow sensor to read too much air so it tricks the computer to adjust the issue.
Posted on May 21, 2009
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