SOURCE: i have a gmc envoy
P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
P0130 02 Sensor Circuit Malfunction (Bank I Sensor 1)
P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0171 System too Lean (Bank 1)
Check your Manifold Absolute Pressure Sensor, and it might be a good time to install a new Upstream O2 Sensor.
It might also be beneficial to have your fuel pressure checked if the engine is really running Lean, but this may be caused by a faulty O2 sensor.
I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514
SOURCE: Can a 2008 4wd (4 x 4) GMC Envoy be flat towed?
any 4x4 should be trailered, as dammage to the trans or transfer can result, if you have to tow i recommend you remove the drive shafts
SOURCE: 2005 gmc envoy fault code P0300
This is a misfire.....Start with the least expensive thing....First thing to try is change your spark plugs to A/C Delco 41-103's. If this doesn't clear the code, you probably have a bad coil which can cost around $70 each.
SOURCE: 2002 gmc sierra p0171 p0174 p0300 oygen sensor and
Check for vacuum leaks to start. Then check the evap system. I just replaced a evap vent solenoid on a suburban with the same codes. fixed the problem.
SOURCE: B0455 code in a 2008 gmc envoy
PO 300---Random Misfires detected ,forget that
PO 305---Cylinder #5 Misfire detected
May be a bad Ignition Coil
Don't throw parts at it,have it properly diagnosed
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