I got a 04 tsx thats throwing a p0135 code changed 2 o2sensors nstill, but when ever i clear the cel i hear a click by the throttle body


Any ideas?

 

OK...P0135 is "Air Fuel Ratio (A/F) Sensor (Sensor 1) Heater Circuit Malfunction"

This sensor is located before the woven pipe that connects to the cat.

Troubleshooting includes verifying fuse 19 (in the underhood box), and fuses 4 and 23 (in the underdash box) are not blown. Otherwise, if sensor replacemetn doesn't clear the code, the choices are still poor/bad connection somewhere or bad ECM/PCM. I'd bet on the bad connection, but there are a whole lot of steps to located the flaw. I'd go professional if you've replaced that sensor and it still shows. I'll note that the underhood box is located by the throttle body, but fuses don't click.