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Six months and 5500 miles ago, I had P0171, P0011, and another code. Ended up getting the VVT intake solenoid, valve cover, and VVT pulley replaced. (Also did the tining belt while in there.) Now the P0011 is back. Car runs fine, but I've noticed that if I'm stopped at a light, the rpms drop a...

Cleaned the MAF, code remained. Took off the negative battery cable for an hour then reattached...2+ weeks without a code.

Did the plugs/coils keep the code away? ~5500 miles after getting all the new VVT pulley, timing belt, valve cover done, the P0011 is back. Maybe camshaft position sensors?

It looks ok, but I need to get some cleaner and go over it anyway. Won't hurt.

Finally got a probe in to measure voltage. Signal bounced around 30-75 mV for a bit, then the engine changed pitch and the number would go as high as 0.7 V. Then it would settle back down. Got behind the wheel to watch the rpms when the pitch change occurred and saw that when the higher pitch...

I'll check it.

Code came back the next day (scan results below). The car runs fine other than idling a touch low. No hesitation, fuel economy seems o.k. for just running around town. Any ideas?

2012 Sonic LS (1.8L), ~150k, had the infamous P0171 come on about a week ago. Pulled the codes (scan tool results below). Air filter is new. Checked the air intake flex-hose for cracks but didn't see anything. (It has a generic aftermarket one as the original breathed it's last months before...

Mine's in the shop now for that plus a couple of other things. VVT pulley is bad, so it's getting timing belt, etc., done while they're in there.