2000 Ford ZX2 Other - General

Question: The Check Engine Light came on, so I took it into a shop to have them check it out. First they say its the O2 Sensor, and replace that. The next day light comes back on, so I take it back. Next they say it's the MAF Sensor, and replace that. Today the light came back on again. I sense a pattern here, are they just trying to screw me over by charging me for new parts that don't need to be fixed, or is it really possible that both these sensors are not functioning and need replacing, or could there be another underlying issue that is just throwing these sensors off and there is really don't need to be replace? Any advice would be helpful, cause I am out of money and I know they are just going to want to replace another part. Thanks

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Technican: Sounds like to me the techs at your Ford dealer didn't follow the complete flow chart for the code they may have retrieved when diagnosing. The check engine light is a very common occurance on Ford vehicles. An O2 and MAF sensor can be a contributor to the problem but there is one that sticks out in my mind that some people very seldom check and thats' their gas cap. If you had failed to tighten the gas cap all the way, or the cap seal is not sealing correctly, air is entering the closed fuel system sending a possitive/negetive code to the ECM whitch in turn can cause the light to come on. Check with your local parts houses(Pep Boys, Auto Zone etc.) Some of these places are offering diagnostic scanning for free or at a nominal price. Rather than take their interpretation of what if any codes they may have retrieved, ask if they can supply you with or tell you where you can obtain the flow chart(s) for those codes. You will see that the parts that have already been replaced will most likely be at the head of the list. I used to tend to read the complete chart and alot of time found myself woring from the bottom up. Paul

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