![]() Good luck finding whatever caused P0133 in your Chevy Cobalt. If the light comes on, even for a second, you know that you have a short circuit causing the P0133 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 P0133 with a multimeter. Wrong O2 Sensor– If you are getting P0133 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.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. Wiring Harness Issues– The wiring that goes to the front and rear oxygen sensors is very susceptible to damage.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. ![]()
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