I have a gmc envoy & the trouble codes are p0107,p0130,p0135 & p0171 can you tell me what the problem can be.

I would be looking at the live data for the lambda sensors to see if one has an issue. From the codes you have its lambda sensor before the CAT.

What is the code ? No code specifically say's there is a vacuum leak . P0171 - P0174 lean condition ! Could be caused by lack of fuel as well , plugged injectors , fuel filter , low fuel pump pressure etc...
How to Diagnose OBD II Fault Codes P0171 and P0174 Leaking Intake and EGR...

P0134 - O2 Sensor Circuit No Activity Detected Sensor 1 Bank 1
P0135 - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1
P0053 - O2 Heater Resistance Bank 1 Sensor 1
P0030 - O2 Heater Control Circuit Bank 1 Sensor 1
You need to replace the O2 Sensor Bank 1 Sensor 1
Carquest can help you get the correct part and help you locate it.

P0130 is the o2 sensor circuit bank1 sensor 1. P0134 is o2 sensor circuit no activety bank1 sensor 1.In other words the o2 sensor on the drivers side before the catalytic converter is bad and needs to be replaced.You will need to reset the computer after its replaced.

do you mean P0107?iagnostic Trouble Code (DTC) P0107 - BARO Sensor Low Voltage Detecte 08.12.2010 · Posted in Automotive Diagnostic Trouble Code (DTC): P0107 - BARO Sensor Low Voltage Detected Description: Sensor operating voltage is less than 5.0 volts (VREF), as a result it failed below the minimum allowable calibrated parameter. Possible Causes: Open in the circuit, or short to ground VREF

P0130----- 02 sensor circuit on bank #1 sensor #1
P0171------System too lean bank#1
The oxygen sensor on bank #1 needs a new one. If you have a V6 engine, the 02 sensor is screwed into the exhaust pipe up near the exhaust manifold on the same side #1 spark plug is, that's bank #1
I don't have my manual at the moment, so I can't tell you exactly where it is.
The sensor down by the catalytic converter is sensor #2 you don't want that one.

Change upstreamO2 sensor on bank #1



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Trouble Code: P0171 (3.8L V6 VIN 1 Auto)
Fuel Trim System Lean (Bank 1) Print this code data Number of Trips to Set Code: 2
OBD II Monitor Type: CCM Details
Indicators: MIL Details

• Fuel Details
• MIL Details

Trouble Code Conditions:
DTC P0101-P0103, P0107, P0108, P0121-P0123, P0130-P0138, P0140, P0141, P0201-P0206, P0300, P0401-P0405, P0410, P0440-P0446, P0506, P0507, P1404 or P1441 not set, engine started, vehicle driven at less than 82 mph at 550-4000 rpm, BARO sensor over 70 kPa (10.1 psi), ECT sensor from 68-230ºF, IAT sensor from 64-158ºF, MAF sensor from 2.8-150 gm/s, MAP sensor from 16-105 kPa (2.6-15.2 psi), fuel level over 10%, and the PCM detected the Long Term fuel trim value was more than +20% for 6 seconds. The PCM controls the air/fuel metering system to good overall fuel economy, driveability, and emission control. During open loop, the PCM determines fuel delivery based on sensor signals, without the oxygen sensor input. During closed loop, the PCM adds oxygen sensor inputs to calculate Short and Long term fuel trim fuel delivery adjustments. Short Term fuel trim values change rapidly in response to changes in the oxygen sensor signals. Long Term fuel trim makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1.

Possible Causes:

• Air leaks in intake manifold, exhaust pipes or exhaust manifold
  
• Fuel control sensor is out of calibration (ECT, IAT or MAF)
  
• Low fuel pressure (fuel filter clogged, pressure regulator failure)
  
• One or more injectors restricted or pressure regulator has failed
  
• HO2S element is contaminated, deteriorated or has failed
  
• Vacuum hose is disconnected, broken, leaking or loose
  

Troubleshooting:2002 Buick Park Avenue, 3.8L, P0171

check the mass air flow sensor there maybe dirt on the filiment inside the sensor causing false readings. cleaning or replacing it may make the codes go away.

P0130--O2s sensor circuit 1
P0134--O2s circuit insuffient Act sensor 1
P0135--H02s heater performance sensor 1