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I just finished Part 2 of the MDX P0175 and P0172 trouble code check engine light repair. I hope this video is helpful to people trying to diagnose and repair the problem. Please feel free to share this with Honda 3.5L owners as well. Search Youtube Acura Running Rich Repair *PART 2* Trouble codes P0175 P0172 -Honda/Acura

Thanks for watching -Ozz
 

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I found these videos very useful. Thanks!

2005 MDX with just under 80K miles.
Check engine light came on with P0172 code (bank 1 too rich)
Freeze frame data showed combined fuel trims of -19.5 and -15.6.

Thanks to this and other great posts, I did a valve adjustment.
As many others report, all my exhaust valves were tight with a couple having no lash, and most intake valves were ok or only slightly loose.

These guides were also really helpful:
skirmich's guide for 2nd gen
pibcak's guide for 2006
 
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