Hey, I have a 1995 Es300 and i'm getting the check engine light, when i read the codes off with a OBDII scanner i get back. P0135 and P0325.

Which are the O2 sensor or Knock sensor. I've replaced both of these and the error codes still appear. I reset them with the OBDII scanner and within a few minutes of driving i get the knock sensor error code again with the check engine light and then within a day or 2 i get the O2 sensor error code also. Is there anything I could try or am I missing anything? I noticed that my throttle body valve didn't open all the way so yesterday I adjusted it til it did open all the way. I reset the codes again hoping that somehow that would have resolved it. But both the error codes came back.

Any help would be much appreciated. Thank you for your time.

 

IU ALWAYS recommend to replace the knk sensor harness with the sensor, as they often go bad, and the plugs often break.

For the 02, sometimes a bad cat will set off the O2 senson CEL.

 

so the one cable attached to knock sensor i should replace? and yea i believe my catalytic converter is bad because i need to replace the exhaust from the firewall to the muffler.

 

I'll give it 50/50 chance the Cat is the cause (or an ehaust leak).

For the knk sensor, did you use a new sensor or a used one?

 

i bought it from ebay. person claimed it was new. that they didn't need it. and when i got it i took a look at it. looked new looked like it was never used.