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I have a 2004 Honda civic DX. I have been struggling with why the crankshaft sensor went on. Reading a lot of topics I thought I would replace the sensor because it kept coming on and based on what I read. After going through the pain of installing it. I got back in the car and the light came right back on after I started it. I reset it and right away it came back on. So I went to the cable and tested it. Again based on what I read and all the test I did.....it appeared good. I have seen where people have said that if this was the case then it is the ECU/PCM. Well before I went through the pain of changing that out I began to think about when this came on. Well my son was driving and the car and it was was overheating. The thermostat was leaking and it was leaking right on to a set of wires/connectors that looked like it was going to the exhaust system right next to the thermostat. 40 minutes later he said that the engine light was on and that the car was stuttering. Hmmm could it be those wires...I have no clue what they are but i figured I would try to dry it out and ht it with electrical cleaner. Rest the lightand stated the car. The light did not come on. Took it for a drive and it started stuttering again after about 10 minutes, but not as bad before. 10 minutes later the light came on. Went back home and sprayed it again. Dried it out with a heat gun. Reset the error. Took it out for a test drive and guess what....it has not come on for days. Now is that what the problem was? Could it have been the sensor and it finally started working? I have no clue. I am just happy it is working again. I am putting this out there because I have see where peoples cars were overheating before they started having problems with their sensor. If anyone knows what that connector I cleaned out it would be good to know

 
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This light --> <-- means "Get the fault code(s) read with a scan tool or code reader".

 
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[QUOTE=ezone;4694663]This light -->

 
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[QUOTE=mckenph;4694666]Thanks for your comment but I did replaced the sensor after checking the code. Reading further in the post you will see that was not what fixed it. I was posting this for others that I have read that has had similar issues

 
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You never stated what the fault code was.

Your first post made it sound like you just started tossing parts at the light without following the usual procedure of figuring out what the fault code(s) are first.



And the overheating issue is usually a head gasket.

 
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On the Honda civic can anyone tell me what the connector is that is right next to the thermostat on the right side. It has a cable that goes right into what looks like the exhaust system with a white probe/cable looking thing. That is the connector that I think is the cause of my problem. Just got a call from my son and he said the light came on again after he turned on the AC unit. Just trying to figure out what the connector has to do with the crankshaft sensor.

 
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Have your son swing by a local parts store and have the fault codes checked.


Report back with actual code numbers.

 
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[QUOTE=ezone;4694663]This light -->

 
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This thread started okay, but its getting really fun now. It's a simple question really and yet I see no code.
What is that thing with the wire in my exhaust...? What could it be...
Codes, I have no codes... but what is that wire going into my exhaust? I can't miss Judge Wapner... 982 toothpicks. Crankshaft Sensor! Judge Wapner, toothpicks, Crankshaft Sensor!

 
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So the code I am getting is p0335. Here are the symptoms. After I reset it I started driving. When it starts to switch gears it starts to stutter and eventually the light comes on. I reset it again. same thing trying to switch gear it started to stutter. Reset it one more time and I could not get it to come on again. I tested the sensor plug and had all the right voltages. It is almost like a vacuum issue on the transmission it seems like. I attached a picture of the connector that I think may have been causing it. It got really wet when I had my thermostat leak. I see that this cable goes to a sensor in the exhaust system and wondering if this is the problem.

 
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P0335: crankshaft sensor circuit no input

Did you plug it in?

The connector you pictured is for the O2 sensor

 
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Yes it is plugged in. Like I said the car eventually will drive without an issue for a while and no code comes in. I drove it at least 20 minutes, hard, after I reset it the third time and could not get it to come back on. I know tomorrow when my son take it back on it will come on again. I guess I need to check the voltages again to make sure that there is nothing in the connector that is broken that every once in a while.

 
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This is a picture of your O2 sensor wire harness connector. Upstream is the one you see at the exhaust manifold. Look below for downstream sensor. You can follow the wires. But that isn't related to a 0335 code...

You replaced Crank Sensor... where did you buy the new sensor? Is it a bosch? Is it a genuine Honda sensor?

 
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It is a duralast

 
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Okay, That is your problem. Replace with the OEM Honda sensor.

 
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I'd rather not use Dura-anything.

See if there is any corrosion evidence in the terminals of the CKP wiring connector.
They sometimes get liquid entering the connector and it rots the terminals from inside.

 
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Well back to the drawing board. I guess I will replace it again with a OEM part. Just ordered it and will check the connector again when I make the replacement. Heck at least It wont take that long since I could probably so it in my sleep. Thanks everyone for your input.

One last thing If I had to replace the connector would I have to replace thewhole harness or could I just replace the connector

 
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Depends.

IDK if you can find a connector and pigtail to splice onto the harness anywhere. Honda doesn't sell them without an entire engine harness attached.

I sometimes scrounge individual terminals and wire from harnesses that have been saved from other wiring harness replacements..