Hello Everyone -

I've been searching on here since last night. Great forum and a tremendous asset to the Honda community.

With that, I have a 97 Civic EX 2dr with a very functional CEL. Code is P0135 and the explanation says "HO2S Circuit Fault Sensor 1". If I'm correct, that would be the upstream sensor on the manifold? Figuring that, is this problem most always caused by a shot sensor? I've seen replies ranging from testing the sensor, to hitting it with brake clean, to simply replacing it. I realize it could also be the ECU port as well. But is the best course of action to just simply replace it and then reset the CEL? Has that been the resolution for mopst of you guys?

Thanks for sharing your knowledge!!

Scott

 

Someone? Anyone? Not even a "Do a search before you post this crap?"

Thanks in advance!

Scott

 

When the heater goes, you have to replace teh whole sensor. The heater is built into the sensor. It'd be a shame though, that if your "ECU port" were the real culprit, you just spent money for nothing. So yes, test it first to make sure it's broke...or take a chance on replacing it. Hitting it with brake cleaner will do nothing. That can only be in reference to trying to clean the O2 element, not the heater. Not that it works for cleaning the O2 anyway, but it surely isn't going to do anything to the heater.

I've had 3 O2 heaters burn out on my Civics (I have 3). All of them required replacement because the heater was indeed toast. Nothing more, nothing less. But I still used my meter to verify each time. It takes all of 30-60 seconds.