O2 sensor shorted out.. Help! CEL light is on?

I have a honda crv 03, 2nd gen.


77k mileage





The other week, after I started the engine, the "Check Engine Light" lights on.


It started like normal. I didn't feel any trouble with it, but I know that may ecm/pcm detected a problem.


I checked the engine oil and it seems to be low. So I brought it to a shop and let them perform an oil change. I thought that this could be the problem why the CEL is on.


The car was lifted with a complete hydraulic lift, and I was able to check the under part of the car.


At first, I was checking the chassis and suspension of my CRV. While walking beneath, I saw my O2 or the Heated Oxygen Sensor (HO2S) sensor wire, stripped!


AND YES, exactly, this is the cause of CEL on. I'm pretty sure.





We have a puppy here in our house, who is always playing, running, sleeping around our parking.


And the fact that he likes to bite and chew anything that he saw and liked, or hanging.





My honda crv O2 sensor looks like this:


http://www.innerauto.com/includes/images鈥?br>




it has a 4 wires;


1 black and 1 grey - which I read from an automotive book that it is for the heating of the sensor.


2 whites - wire sending the signal to the ECU or ECM or PCM or ECM/PCM


- The 2 whites were extremely stripped apart, and the moment I saw these wires were intertwined. Which I suspect to cause an short circuit (I'm not sure)


- The other 2 (black and grey) are still okay.





I'm quite sure that my O2 sensor is still functional, it is only the white wires have the problem.


so I removed the O2 sensor.


I get an environmental splice from a electronics store and connected the 2 white wires.


I thought that this will solve the problem, but the CEL light is still on.





-I remove that negative for 15 mns. CEL on


-I remove the positive for 15 mns. CEL on


-I remove the positive and negative. CEL on


-I remove the fuse under the hood. CEL on


-I remove the fuse inside the car. CEL on





I don't know what to do.


I am planning to bring it to a shop with a ecm/pcm diagnostic tool.


But I'm sure that they will be giving me an o2 sensor problem here, and cost me bucks just for that simple **** scanning. If only I just have that scanner. sheesh..





Any advice there? Thanks. I will really appreciate.


And oh. I am also aware of removing the negative or positive overnight.


But I don't really believe on it. Honda's ecm/pcm are very intelligent and can detect immediately a new part connected.


But still, if you will advice me to do it for a good reason. I will. Thanks :)


Please help me. Help me from those Auto Mechanics who will cost me money just for this little job.





Please use simple terms in explaining :)


I am just a 19 yr old, aeronautical engineering and aircraft maintenance student.


thanks|||You can normally get any good auto parts store to pull a code from your obd II port. That will tell you what the check engine light is on for. If it's the O2 sensor, you might as well replace it. There are 2 types of sensors, pre and post catalytic converter. Make sure you get the right one. You can get the new sensor from any auto parts place or order them online. They should come either with a plug that matches your car's wiring or (and this is probably the one you want) a "splice" type connector with extra wire length.