P1071 Code: System mixture to lean (Bank 1)

[BNaylor]

I would would pursue the P0102 DTC which is the MAF sensor. It has a low output frequency of less than 1500 Hz. Also, FSM lists it as a possible cause of the P0171 DTC. A scan with a full function scanner which Autozone does not use would probably show the short and long term trim values out of spec and point to the MAF.

I mentioned earlier to disconnect the MAF and then check driveability. See if the hesitation and bog disappears. You can safely drive with the MAF disconnected. The PCM will switch over the default programming when it sees no MAF signal.

Originally Posted by BNaylor

Switch back to the recommended 91 octane or better and then see what it does. Combustion chamber and exhaust temperatures are higher with lower grade octane. It may have affected the pre-CAT 02 sensor. The Bank 1 02 sensor is used to control the fuel injection system in closed loop mode of operation. DTC P0171 indicates you are getting a short term or long term fuel trim either due to a lean or rich condition.

Also, disconnect the MAF sensor and see what it does?

[STONEBOSS1]

Well I pursued the P0102 DTC. As suggested I unplugged the maf (with car off this time). Car idled much better with no hesitation or stalling at all. Purchased some CRC maf cleaner, removed maf, cleaned and re-installed.
But symptoms remained the same. Ordered a new maf sensor from AZ
(cardone). Installed as per directions supplied, and the car is performing beautifully. Prior to installing the new maf. I sprayed the throttle with CRC throttle body cleaner. BTW SES indication dissapeared on its own. So in closing this thread. I would like to thank the following for there help and input.
BNaylor, MaxWedge,Mikey#1 and Stripe. Thanks.