Someone please help me?!? I scanned my computer with a MAC Tools scanner and it read codes PO171 and PO174. My engine light intermittently goes off and on. At first, I thought it was an O2 sensor, but it looks like it may be something else. What does that mean what do I do to fix it? Thanks.

 

http://shbox.com/1/Dtcs.htm good place to start!

 

Your engine is 1) running so lean that the PCM can not correct the problems, using the maximum range of the long term fuel correction (+25%); or 2) False information is causing you PCM to assume the above.

Actually running lean:
-inadequate fuel pressure
-faulty MAF
-huge vacuum leaks

"False" lean:
-exhaust leaks before the O2 sensors
-excessive misfires
-faulty O2 sensors

 

Thanks, I appreciate the help...I'll try it and see what happens.