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Carguy1, Hyundai Technician
Category: Hyundai
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HELLO AGAIN I HAVE A 2004 HYUNDAI ELANTRA IT HAS A CODE PO171

Resolved Question:

HELLO AGAIN I HAVE A 2004 HYUNDAI ELANTRA IT HAS A CODE PO171 I CHANGED THE BOTH O2 SENSORS ONE ON THE EXHUST MANIFOLD AND ON THE EXHUST PIPE BEHIND THE FLEX PIPE I EVEN CHANGED THE FLEX PIPE ANY SUGGESTIONS THANKS DOM1026

Submitted: 12 months ago.
Category: Hyundai
Expert:  Carguy1 replied 12 months ago.

Hi there!
Usually this code is caused by a vacuum leak, low fuel pressure or a bad mass air flow sensor. Because the car is running lean, normally a vacuum leak. I have also seen a blocked converter cause the issue. I would start by checking for leaks along the intake, around the pcv valve, then with a scan tool, get the readings from the maf sensor.
Hope this helps!

Carguy1, Hyundai Technician
Category: Hyundai
Positive Feedback: 97.6 %
Satisfied Customers: 18572
Experience: I have over 25yrs experience on all makes and models. Factory trained for Subaru and Nissans
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