WHAT IS THE SOLUTION TO CHECK ENGINE CODES P0171 & P0174 'O2 HYUNDAI SANTA FE

P0171 HYUNDAI - System Too Lean Bank 1... Possible causes - Intake air leaks - Faulty front heated oxygen sensor - Ignition misfiring - Faulty fuel injectors - Exhaust gas leaks - Incorrect fuel pressure - Lack of fuel - Faulty Mass Air Flow (MAF) sensor - Incorrect Positive Crankcase Ventilation (PCV) hose connection. If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.......P0174 HYUNDAI - System Too Lean Bank 2... Possible causes - Intake air leaks - Faulty front heated oxygen sensor - Ignition misfiring - Faulty fuel injectors - Exhaust gas leaks - Incorrect fuel pressure - Lack of fuel - Faulty Mass Air Flow (MAF) sensor - Incorrect Positive Crankcase Ventilation (PCV) hose connection... If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.

To Rowefast, I just want to thank you for your answer to my question. I purchased the three O2 sensors and am having them replaced. My mechanic said thank you also for confirming his answer. I checked with car gurus to see if there were any uther suggestions if that wasn't it. In short, THANK YOU WHOLE HEARTEDLY. OMPADAN

You just made my day! I like doing this stuff and it is nice to know that it matters, and helps people. Thank you.

i have code p 0171 and misfire in cylinder number 5 in my 2005 santa fe. I changed the spark blugs and the wires