Question about 2000 Pontiac Sunfire

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O2 Sensor replacement

P0134 & P0130 Check engine light codes. Points to the O2 sensor. How many O2 sensors are on this vehicle and where are they located? Thanks.

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Most cars have only 2 o2 sensors one is below the exaust manifold and the other one near the catalytic converter

Posted on May 27, 2009

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


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Check your Manifold Absolute Pressure Sensor, and it might be a good time to install a new Upstream O2 Sensor.

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Jul 19, 2010 | GMC Envoy XL Cars & Trucks

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P134, p0141, po300, po130 and po135. 2005 Sunfire.


Given that most of the trouble codes are for the O2 sensor, I think I would change it. The multiple misfires could be because of improper fuel/air mixture caused by a bad sensor. Disconnect the negative(-) battery terminal then change the sensor. Disconnecting the negative(-) should reset the computer and allow the fuel/air mixture to return to default allowing the engine to start.
P0130 - O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
P0134 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
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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.

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I went to the inspection station and they failed my car for this diagnostic problem p0134 which makes the check engine light come on


A code P0134 may mean that one or more of the following has happened:
  • Bad O2 (oxygen) sensor
  • Bad heater circuit in the O2 sensor
  • Wiring or connector to the sensor frayed / broken
  • Blown heater circuit fuse
  • Holes in the exhaust system
  • PCM failure
The most common fix is to replace the oxygen sensor (O2 sensor). But that doesn't rule out the possibility of:
  • Rusted exhaust pipe
  • Inspect wiring & connector(s) for problems
  • Excessive amperage blowing heater fuse (still requires replacement of sensor but also replacement of blown fuse)
  • Replace PCM (only as last resort after all other possibilities are covered.
If you go to Auto Zone, you can pick up the O2 sensor and they can give you the step by step instruction to replacing the upstream O2 sensor. "before the catalytic" If you don't have a O2 sensor socket, Auto Zone has that as a loner tool or you can buy one for around $8.99. But your better off using the loner tool and can replace the O2 sensor your self there in about 30 min, could be quicker but the engine may still be to hot to work on. Good luck

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