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P0171 on 2002 Echo
A month ago, son's 2002 Echo started showing the CEL. Had a scan done at Autozone and the P0171 code came up.
After doing some research, we bought a can of MAF cleaner and disconnected the battery cable, sprayed the sensor down, waited for it to fully dry and reinstalled it. My son started the Echo, backed out of the spot, shifted into Drive and then got no response from pressing the gas pedal. Turned off the engine, turned it back on, and the CEL came on again. But this time, the car had no problem responding to gas pedal pressure in Drive. And until tonight it didn't happen again.
With the CEL light still on and my son needing to have his emissions test done, tonight we attempted once again to fix this P0171 issue. Hoping that maybe we had done an inadequate job of cleaning the MAF sensor the first time, we once again tried the same procedure. And once again, after starting the car immediately following reinstallation of the sensor, he backed the car up and then no received no response from the gas pedal after shifting into Drive. Turned off the engine, turned it back on, CEL came on and then problem with the gas pedal disappeared.
I can't tell if this is the sign of a bad MAF sensor or instead a sign the part is actually working correctly and reacting to another problem. I would assume that a bad sensor would introduce the fuel flow issues on a more consistent basis, but then again, this has only appeared immediately following a sensor clean. Any thoughts here? I'd rather not purchase a replacement sensor unless we can be assured it will fix the issue.
Any guidance is appreciated.
* Edited to correct code #
Last edited by Mumford67; 06-08-2017 at 07:53 AM.