• Register
Ask OBDII Question

Engine Light ON?

The Engine-Codes.com ELM327 WiFi Car Diagnostic connects to your Android phone, iPhone, iPad, or Windows computer from your vehicle.

20,379 questions

10,327 answers

627 comments

7,542 users

Top Users

Reynaldo (3858 Points)
G37driver (2956 Points)
OBDIITech (2389 Points)
milonajo1 (737 Points)
OBDtech2 (165 Points)
corvette-78 (127 Points)
knowledge 1488 (124 Points)
Samat Bekov (117 Points)
ptl (113 Points)
sabtele (112 Points)

code po171 in a ford focus

Vehicle: 2006 ford focus 4cyl.
asked Sep 20, 2012 by anonymous

2 Answers

This indicates a lean fuel mixture. Normally caused by a leak in the vacuum line to the pcv valve. This can also be caused by low fuel pressure and a faulty mass air flow sensor. If you don't find a vacuum leak, then it's best to be properly diagnosed with a scan tool
answered Oct 27, 2012 by milonajo1 (737 points)
I had this error and finally found the problem. The PCV valve hose was split. This is located under the intake manifold. It took about 45 minutes to take the intake off so I could get to the hose. I replaced it and it took me less than 30 minutes to reinstall everything. The code went away and the car is running great.
answered Jul 26, 2013 by Tim

Related questions

1 answer
345 views asked Aug 6, 2012 by anonymous
1 answer
Home - About Engine-Codes - Privacy Policy - Terms and Conditions - Copyright 2010- Engine-Codes.com

Engine-Codes.com - PerfectMats.com - TheAutoMedia.com
HelpForCars.net - Infinitihelp.com - Nissanhelp.com - CarZoneAutoRepair.com

...