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I have a 2005 Honda Civic Coupe VP and I had a check engine light on. Diagnostic said this:
"P0135 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)"
So I bough the Upstream Sentor and replaced it. After I installed a new sensor check engine light is still there which is a real problem for me. I have been told that the problem is the wiring for the heater. This is where I need help. I need to know where is the computer located exactly and what color wires are on the connector and which connector goes into the computer. I really appreciate any help I can get.
Thanx a lot.

 
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I too am in the same spot as you. Except I have a 2000 HONDA civic ex. Same trouble though.

 
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Well at least i know im not the only one with this problem. i did find somthing out though, in my case when i connect a battery charger to the battery at 40 amp rapid charge the engine lite goes out. have no idea what it meas but i hope it helps.

 
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Hey man I have the same thing going on with my EX. I talked to a friend who is a master mechanic that specializes in diagnostics and he said it wont go away with an aftermarket o2 sensor. He has had mutliple rsx/em2 come in and you have to go to honda and buy the o2 sensor from them. Only problem is that it will cost $125. Which is outrageous but thats the only solution homeslice.