There are multiple O2 sensors in Honda Odyssey, how many depends on vehicle configuration and model year. If you have anything that you would like to add, please feel free to leave a comment below.Upstream and downstream O2 sensors Upstream O2 sensors are important for engine performance Good luck finding whatever caused it in your Honda Odyssey. Most of the time with P0161, it’s going to be the oxygen sensor itself that has caused the code to trigger. If the light comes on, even for a second, you know that you have a short circuit causing the P0161 trouble code. If it’s not getting any voltage, attache 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 Odyssey’s O2 sensor, or wiring harness that’s the issue. It is possible to diagnose the P0161 with a multimeter. Here is a fantastic video that covers all aspects of diagnosing a P0161 trouble code. Wrong O2 Sensor– If you are getting P0161 after having recently replaced your Oxygen sensor, it may be that the replacement is wrong or bad.Blown Heater Sensor Circuit Fuse– Here’s how to test if a fuse is blown (Youtube).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 Damage– 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. Bad Oxygen Sensor– The oxygen sensor itself is one of the most likely reasons that P0161 is triggering your service engine soon light.P0161 is most often fixed with a new downstream (after catalytic converter) O2 sensor They are presented in order (somewhat) of most to least likely to cause the problem. Here are the most common issues that cause the P0161 code in the Honda Odyssey. 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. It should not be considered a breakdown risk. Typically, the only symptom of P0161 is going to be the service engine soon light. When it goes bad, it is more difficult for the engine to get the air fuel mixture right. The purpose of the heated element in the oxygen sensor is to quickly bring it up to normal operating temperature after your Odyssey has been started. Some of the other causes of P0161 are listed below. Replacing the Oxygen sensor will fix the problem a majority of the time. It is typically caused by a failure in one of the elements that heat the oxygen sensors, specifically bank 2 sensor 2. P0161 is a very common OBDII code that occurs in the Honda Odyssey.
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