Question about Chevrolet Tahoe
These codes ( Cylinder banks one and two lean) indicate that your engine is running lean, that is to say to much air and not enough fuel, since both cylinder banks are giving the same system lean code you do have a problem with fuel mixture control and not the O2 sensors, look for engine vacuum leaks like hoses, spray around the intake manifold with propane to see if the engine sounds different, when you find a leak it will change the idle speed, you can also have a detective Mass Airflow sensor or loose hose clamps on the engines air intake hose after the MAF sensor. causing this if no vacuum leaks are found
Posted on Feb 10, 2012
Testimonial: "Thanks Dennis! We just replaced the hoses on the power steering . That was leaking. O2 sensors have been coding also. We shall go back in there to check hoses and clamps. I think I still hear the pump some. But then I think it is just the Chevy whine. My Camaro has about 180,000 so I guess it's about time isome some things to go! It does seem like it is not getting enough gas. On taking off easy it kind do hesitates. If I get down on it it goes. But last couple. Of days it seems like it is having a hrd time running and getting enough gas. We will try your solution. Thanks"
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Posted on Jan 02, 2017
dont take soo much in consideration after you have make all this things, some time is on only for any wire faulty, or a shrt electrical arc in any place in wire system. ask auto tap mechsnics for this maybe they have similar case before.
Posted on Apr 06, 2009
SOURCE: codes #171 & 174
first check out for o2 sensor if its faulty this can show up.but if its proper.Evaporative emission control system leak very small 171 System too lean (bank 1) 174 System too lean (bank 2)
Posted on Jan 05, 2009
Two bad O2 sensors is rare. The problem is before the sensor,intake vacuum leak, injector lower o-ring, IMCR stuck open or the control rod is off, vacuum hose(s) off, or MAF sensor. If this has a plastic upper intake, they had problems with o-rings.
Posted on Oct 07, 2009
switch, we run off snitches. 171 174 banks 1 & 2 Lean. Most likely cause are Upper Intake Manifold Gaskets, failed seals. It's not 1990 on. It's 1996 and on OBD2.
Posted on Nov 03, 2009
P171 Lean to bank one
P172 Rich to bank one
P174 Lean to bank two
P175 Rich to bank two.
These are conflicting codes. I would suspect that you have a bad MAF sensor. take it out and try and clean it before you replace it. It could also be a bad O2 sensor. But unlikely that both sides went bad at the same time.
Posted on Jan 08, 2010
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