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

Asked by Jan 04, 2017 at 06:12 PM about the 2002 Hyundai Santa Fe 2.7L LX FWD

Question type: Maintenance & Repair

Car runs great at idle in gear, out of gear with load and normal driving. no
hesitation or sputter. Runs normal. no change with "check engine" light on or
off. It is using more gas than usual. cleaned Mass Air sensor unit, air filter,  
checked for intake  and vacuum leaks negative reults.  

3 Answers

87,065

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.

3 people found this helpful.

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

87,065

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

1 people found this helpful.

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