I have an 05 Hyundai Tucson with 2.7L engine with 85,000 miles. It is setting a P0171 lean bank one code. However, both banks are operating at near the high threshold levels around 14.8%. Numerous attempts and test have been tried to resolve the issue. ECM has been reset to base several times and the fuel trims follow the exact same pattern each time while driving the same highway pattern. It typically only takes around 15 miles for LTFT to rise from 0 to 14.8% on B1 with B2 closely behind. When B1 does set the P0171 code it's not storing any freeze frame data to help locate a possible cause. Anyone have any ideas why no FFD's? Any help would be greatly appreciated. Thanks, Ronnie3945
I can only speculate why no freeze frame data is being stored with the p0171. My "guess" would be that it is a 2 trip code, and you are seeing a pending code on the first trip.
When it comes to p0171, you don't really need freeze frame to help you out. Since this code is a direct result of fuel trim, the next logical step is to see if the total fuel trim, (short term plus long term) rise at an idle, under a load, or remain constant at idle and load.
Watching the fuel trim behavior under different operating conditions will eliminate more possibilities for p0171 than Freeze frame data.