2005 Chevy Equinox. Check engine light P0171 and P0496.
Repairs done prior = Had an oil change.
Had the codes scanned at Autozone.

Question = My check engine light came on a few days after I had an oil change. Had the computer
scanned for codes at Autozone and came up as p0171 lean, and P0496 evap system purge or
something. What are some common causes for this.
2005 Chevrolet Equinon 3400 V6 common cause for a check engine light scanner code P0171 lean condition.
Location of possible vent
tube mis-positioned. Under
the coil / ignition assembly.
Answer:
The code p0171 is a common code to turn on a check engine light after an oil change on this
vehicle. If the oil change facility checked your air filter, then  most probable cause for this code is
that they have accidentally disconnected a vent tube. This tube goes from the air intake duct on the
air filter housing, to the rear valve cover under the ignition coil / module. (see pic ) Just reach under
coils and plug the hose back into the top of the valve cover.
P0496 is described as "
Evaporative emission system purge during non-purge event"
This is usually caused by a faulty purge solenoid. Under the engine cover, on top / passenger side
of intake manifold.
Cant figure out how the hose connection is held on possibly a clip got the breakdown from gm
parts on mass air flow sensor tube only calling them for valve cover breakdown later.
Comments
That tube is not held into position with
anything. It's routing under the ignition
module and the rubber grommet in the
valve cover hold it in. But when it gets
moved as stated above, then it came loose.
Got a breakdown on rear valve cover and the show a small 1in. Bolt with a tiny
grommet not inclined to figure out if it goes through the tube.
Had to buy the tube only $10.00. Cost $95.00 for them to put it on.
I have the same problem wit my 05 equinox. I want to know if replacing the tube
fixed your problem. pls let me know.
I have A 91 S-10 pickup the problem is when it idles for A while it will miss and
then come back and run ok  Rod.
Sounds like you could just have bad spark plugs and wires or distributor cap.
Also maybe a leaking fuel pressure regulator (FPR)
I recently took my equinox in for Texas state inspection and the car did not pass
due to several sensors being off line.
Evap, O2 sensor, and EGR system. All
with Not Ready reading. I have recently changed the battery however this has
been over 300-500 miles ago. I have called several dealers and they suggest
more driving. This seems very odd.
These tests take very specific conditions to
run. I would agree that more driving is
needed. Get on the highway at a steady
speed for at least 10 minutes, come off
and sit at a stop for a few minutes, turn car
off and do it again, etc. Test will not run if
there are ANY codes stored in the
computer. This does not mean the check
engine light is on. There could be codes
stored in history with no light.
i am also getting the P0496 code on my 2006 equinox and i have replaced this ...
This is usually caused by a faulty purge solenoid. Under the engine cover, on top /
passenger side of intake manifold. Is there another one i am missing closer to the gas tank, any
diagrams or pictures to show me what to look for? Thanks in advance
5.3 liter GMC Envoy code P0455 is that the sensor on top of gas tank.
Code P0455 is a large EVAP system leak.
That could be caused by several things. A
gas cap that is loose or not sealing, a bad
vent valve, broken line or the fuel tank
pressure sensor (that is on top of the tank).
Que tal me pueden decir dnd se ubica la anetrada para el escaner de la equinox?? saludos.

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Chevy Equinox P0171 Common Causes