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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1667
Experience:  GM Grand Master Technician 2007. 14 year experience.
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P0171 failure replaced o2 sensor #1 no help... thinkimg map

Customer Question

p0171 failure replaced o2 sensor #1 no help... thinkimg map sensor because load reads 100$% a lot..
JA: Have you located all of the vehicle's oxygen sensors? Are the wires leading to and from each intact and in good shape?
Customer: yes I can see the sensiior values on a Bluetooth obdii
JA: What is the model/year of your GM?
Customer: 2006 envoy
JA: Are you fixing your Envoy yourself? What have you tried so far?
Customer: v6
JA: Anything else you want the mechanic to know before I connect you?
Customer: cant think of it...
Submitted: 4 days ago.
Category: GMC
Expert:  david craig replied 4 days ago.

Hi Im David thanks for visiting the site. allow me a few moments to pull up some information for you. thanks

Customer: replied 4 days ago.
ok...
Expert:  david craig replied 4 days ago.

P0171 refers to the fuel trim system being lean. Possible causes could be water in the fuel, too much alcohol in the fuel, a clogged fuel injector and/or a weak fuel pump. check out these TSB's on your vehicle.

http://ww2.justanswer.com/uploads/heavychevy396/2011-09-09_130742_2006_gmc_envoy_p0171_tsb1.pdf

http://ww2.justanswer.com/uploads/heavychevy396/2011-09-09_130807_2006_gmc_envoy_p0171_tsb2.pdf

http://ww2.justanswer.com/uploads/heavychevy396/2011-09-09_131404_2006_gmc_envoy_p0171_tsb_3b.pdf

Expert:  david craig replied 3 days ago.

checking in to see how its going

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