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I read in a forum about the undefinedPO171 code being an O2 sensor. I also read in a forum that the code is identified with the MAF sensor. The first time i got my code i replaced BOTH o2 sensors and it still keeps comming on. As of recently my mpg has been going down hill drastically. im talkin about from 16-17 to 14.6 in a matter of 2 months....and still falling :eek: !. I need a suggestion if it is my MAF sensor. Or if i have a serious problem on my hands.. For information there are no engine modifications other than replaced 2 o2 sensors
 

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go buy some electrical contact cleaner from Radio Shack. The kind that is safe on plastics. Clean the maf really good and then reset the computer by either disconnecting the battery for 30 mins or just taking out the ECU fuse for a few seconds.
 

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is there a thread on how to clean it? and is it smart to run Sea Foam in the engine and gas after cleaning the sensor to clean the rest of the engine? i heard in many trucks and other vehicles that Sea Foam makes it idle very rough
 

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As cooper said buy the electrical contact cleaner, remove the maf from the airbox spray it down with electrical contact cleaner, allow it to dry, and replace.

Dont touch the sensor with your hands, dont wipe it with a rag. Some people have used brushes on them, I prefer to spray it clean with contact cleaner.

If you have cruise control:
To remove the maf sensor I pull out the airbox. 3 bolts, one on the core support, one on the fenderwell behind the airbox, one on the fenderwell between the core support and the airbox.
Unplug the wire to the sensor.
Remove the two screws holding the sensor.
Without cruise control there are no cables in the way:
Unplug the sensor
Remove the two screws holding the sensor.

Takes about 20 miniutes to R&R and clean.

Seafoam wont affect the maf sensor, it's up near the airbox.
But seafoam does seem to work well on these trucks.

Tim
 

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That code refers to running lean on a cylinder bank. Most liekly it is caused, like said above, from a fouled up MAF sensor. Once you clean it take both terminals off the battery and touch them together to reset the ecu and most likely the cel won't come back on.
 

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KStacoma said:
Once you clean it take both terminals off the battery and touch them together to reset the ecu and most likely the cel won't come back on.
Pulling the EFI fuse is soooo much easier; and since this is the internet we'll probably end up with some kid who reads this post and holds them together for 30 seconds and acid burns his pimples off.
 

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LMAO, i didn't think about that lol, good call man!
 
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