2001 Lexus RX 300 "keep getting 02 sensor codes" Questions

getting to cost me big bucks , and still get the code ? Do you only have one o2 sensor? Many cars have two- one in front of catalyst, one behind. The front one is for fuel trim. Also, that code is for

keep getting a code 420. I have change the cat twice and the plugs as well. What else it there to do? Spark plugs or 02 sensors? The rear 02 sensor is what sets this code. The numbers it produces, how

...02 SENSOR HEATER CIRCUIT MALFUNCTION (BANK 2 SENSOR 1) PO 171= SYSTEM TOO LEAN (BANK 1) PO 174= SYSTEM TOO LEAN (BANK 2) I WOULD SAY YOU HAVE FAULTY OXYGEN SENSORS CAUSING THE ENGINE TO RUN TOO LEAN ...

...getting this codes p0135 and p0138 P0135 is 02 heater circuit ( Bank 1, sensor 1 ). P0138 is 02 circuit high voltage ( Bank 1, sensor 2). It is a good idea to replace all 4, 02 sensors at the same ...

keep getting po155 code even after replacing 02 sensor several times with new one from dodge. Had transmission replaced under warranty and have been chasing 02 sensors ever since. All but 1 has been ...

...02 sensors twice and my check engine light keeps coming on Code 038 means the computer is getting a high voltage return in the heater circuit from the O2 sensor mounted after the catalytic converter. ...

...02 sensor" is detected. Any idea what would cause this. Cars of course runs fine...just cant get it to smog with CEL on Code 141 is for the heater circuit for bank one sensor two. That is the O2 ...

...02 sensosensor, still running horrible and code still there P0135 is a 1/1 o2 sensor heater performance fault (make sure that you are using factory o2 sensors) Chrysler products do not get along well ...

...keep popping and i keep getting a code (P1610). how would you fix this are star fine the probelm Change the O2 sensor. the heater element in it, is shorted out. That is what happens when they

...02 sensor probable cause - exhaust leak near 02 sensor or failed 02 sensor or fuel contamination. I put in chevron highest grade gas and fuel injection cleaner and light is still coming on. what is ...