Po171 /02 03

Joined: Jun 25, 2008 Posts: 5

2001 Sonata 2.4 engine
Here is what the car is doing. When the car sits usually overnight when i drive for the first few minutes the car lunges as if i'm driving fast. the car then drives normally this only happens if the car been sitting for a long time (overnight ) I got the code po171 01 02 .
I change the air filter and clean the MAF sensor light went out and drove better for a few days. then the code came back po171 03
The lunging problem seem to be the throttle as i have not check that yet been searching this problem for about 4 weeks.
sometimes the lunging goes away for a few days and then returns.
I also clean the throttle body with throttle body cleaner. Any way i can check to see if the throttle sensor is the culprit .Any help appreciated
When i drive around 100 kmh i can feel a slight hesitation but once i go over that speed the car runs great.
I've also been checking for vacuum leaks so far no luck if i can't find the problem soon i will have the dealer check it out. I just don't want to throw parts at the problem

External Since: Oct 09, 2004 Posts: 1966

Check for air leaks into the engine-- especially the PCV hose.

Finding none, a P0171 problem is typically the air flow sensor. Cleaning
the sensor often yields poor results. Most likely, you'll need to replace
it.

I don't know what 01, 02, and 03 indicate. Can you elaborate?

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