MAP sensor

2006 FORD ESCAPE
140,000 MILES • 4 CYL • 4WD • AUTOMATIC
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CN2092
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Hey guys,

My check engine light is on and the tester says that the MAP sensor needs replaced. I am wondering what the best way to get to the MAP sensor is? Is it easier to take off the oil filter and go from underneath or to remove the battery and go from the top? Do you have a video or any pictures or anything of this procedure that you could show me?

Thanks
Nov 6, 2017 at 12:17 PM
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CARADIODOC
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There are two problems. You did not list which engine you have, and the diagnostic fault code did not say to replace the MAP sensor. Fault codes never say to replace a part or that one is bad. They only indicate the circuit or system that needs further diagnosis, or the unacceptable operating condition.

You need to list the exact fault code number too. There are over a dozen codes related to MAP sensors, and they mean very different things. When a sensor is referenced in the fault code, there is only about a fifty percent chance that sensor is the cause of the code. Too many people think we just read codes, and those tell us what to replace. Sure would be nice if it was that easy. First we have to rule out wiring and connector terminal problems, and mechanical problems with that system, before we spend your money on a part.

You did not list a symptom either, if there is one other than the check engine light. Chrysler is the only manufacturer that has been able to make their engines run right with just the MAP sensor. All other manufacturers use the mass air flow sensor for their main fuel metering calculations. Their MAP sensors are used mainly for barometric pressure readings, and have relatively little effect on engine performance.

I looked up a 2.3L non-hybrid engine. They only show the wiring connector, but not the sensor. Typically, how you get to it is what we also struggle with. Every mechanic will do it a different way, but I prefer to avoid disconnecting the battery. On some car models, mostly imports and GM products, doing so can cause some computers to lock up, requiring a tow to the dealer to have them unlocked.
Nov 6, 2017 at 3:23 PM