check engine light on 2000 Nissan Quest

check enging light p0325 knock sensor bank 1 or sensor closed loop bank 1 p0135 o2 sensor i bought the car with check enging light on i 've changed on of the o2 senser and i did tun up on it but still the light still the code in the scanner readind the code in the top

by in Hilliard, OH on February 04, 2009
3 answers 1 comment
ANSWER by on February 04, 2009
I want to help, but I'm unsure what your question is?
ANSWER by on February 04, 2009
Did you clear the code after the repair? Did the check engine light come back on?
ANSWER by on February 04, 2009
The PO325 knock sensor code is common on many Nissans, it doesn't bring on the Service Engine Soon if is performance related, it will bring on the light if the sensor goes open circuit.. These engines just always seem to have that code when you are presented with another trouble code, so go after the Oxygen Sensor related code first. The code P0135 is for the heater circuit control in the front O2 Sensor. If you still have the old O2 sensor check the electrical connector on the old sensor two of the wires should have continuity to each other (this is the heater circuit, if none of the wires at the connector have continuity the sensor is in fact defective but they sometimes go "open only when hot operating conditions). The electrical harness itself gives problems and failure occurs bringing on the Service Engine Soon light. Ignition key on you should have power (12V) at the disconnected O2 sensor harness. The computer grounds the sensor heater circuit as required. The problem may have to be fixed by "ohming" out the harness wires until the fault is found. I suspect by fixing the P0135 problem your service light will stay out once reset. The knock sensor is labor intensive to replace.
COMMENT by on April 21, 2014
I have a similar problem. Only my codes are 324 and 305. It idles a little rough but drives fine. makes a squeaky noise, not loud, and once it's in a smooth idle when I'm driving it you can barely hear it. I put gas in it over a week ago so I don't think that did it. Been running fine the whole day. decided to go to mcdonalds and service engine light starts flashing then stayed on and every now and then flashes again. The guy at orielly's suggested replacing the knock sensor, would like to be sure before i spend money i dont have on something that won't fix the problem! signed mother of four!
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