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2006 chevy cobalt oxygen sensor how to#
2006 chevy cobalt oxygen sensor code#
2006 chevy cobalt oxygen sensor free#

If you have anything that you would like to add, please feel free to leave a comment below. Good luck finding whatever caused P0138 in your Chevy Cobalt. If the light comes on, even for a second, you know that you have a short circuit causing the P0138 trouble code. If it’s not getting any voltage, attach the test light to the harness plug and shake the wiring a little bit. You can also use a voltage test light to determine whether or not the oxygen sensor is getting any voltage at all (they’re about $5 at Walmart).

If it ends up being a wiring issue, it’ll save you money over buying an unnecessary O2 sensor. If you don’t have access to a multimeter, it certainly wouldn’t hurt to check the wiring to between the fuse box and the Oxygen sensor first. If you use the multimeter, you’ll know whether or not the voltage coming to and from the oxygen sensor is within spec, this can help you determine if it’s your Cobalt’s O2 sensor, or wiring harness that’s the issue. It is possible to diagnose the P0138 with a multimeter. Wrong O2 Sensor– If you are getting P0138 after having recently replaced your Oxygen sensor, it may be that the replacement is wrong or bad.You’ll want to make sure that there is voltage going to it. Damage to the Terminal– The terminal that the oxygen sensor connects to (the plug) is also relatively susceptible to damage.

2006 chevy cobalt oxygen sensor how to#

The downstream sensor is especially susceptible to this problem Here’s how to find a short in the wiring harness (Youtube). This is due to the fact that O2 sensors are under the chassis where they are subject to punishment from road debris, and they are subjected to a lot of exhaust heat.

2006 chevy cobalt oxygen sensor code#

If it finds an issue in the heater circuit for the engine bank 1’s downstream oxygen sensor, it sets code P0141. Your car’s PCM tests the oxygen sensors’ heater circuits for integrity.

Wiring Harness Issues– The wiring that goes to the front and rear oxygen sensors is very susceptible to damage. It indicates that there’s a problem with the heater circuit of engine bank 1’s downstream O2 sensor.

They are relatively affordable at Autozone or Amazon. Although it is a temptation to replace it right away, it wouldn’t hurt to check out the wiring harness around it beforehand.

Bad Oxygen Sensor– The O2 sensor itself is one of the most likely reasons that P0138 is triggering your service engine soon light.

They are presented in order (somewhat) of most to least likely to cause the problem. Here are the most common issues that cause the P0138 code in the Chevy Cobalt. A poor air fuel mixture going through the catalytic converter But, like anything that causes the service engine soon light to come on it is a good idea to have it fixed as soon as possible. Most of the time, it’s not a breakdown risk. In some cases, there can be other symptoms as well. Typically, the only symptom of P0138 is going to be the service engine soon light. Here’s a pretty helpful video from AutoEclinic on diagnosing the code: There are also some less likely problems that can cause P0138.

Voltage to the sensor is to high (wiring problem, think short).

The voltage at the sensor remains above threshold for 20 seconds or more.

P0138 is a common OBDII code that occurs in many vehicles, including the Chevy Cobalt.