Question about 2000 Lexus RX 300

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Engine Light I have a 2000 RX 300 and the engine light just came on - the oil was recently changed; I checked the gas cap like manual said, could there be other major problems has anyone had this problem? This is Beckster777 with rx300 engine light on (emmissionwiz) O'rilleys gave these codes: P1135 A/F sensor heater circuit malfunction bank 1 sensor 1 P1130 a/f sensor circuit range performance malfunction bank 1 sensor 1 P0171 system too lean bank 1

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  • bb31047 Apr 15, 2009

    I bridged the 2 points E1 and TE1 and the check engine light did not pulse it stayed steady on...The dia. box was on the drivers side under the hood not the passenger side tho..but I found it....Any other suggestions?

  • bb31047 Apr 15, 2009

    My check engine light stays on all the time, Toyota checks the codes and said I needed a A/f ratio sensor so I purchased $235.oo and it stayed off for about 30 minutes then came back on, been on ever since 8 months. I had oreilleys check it and they said I needed P1135 P1130 and P0171 sensors they did a OBD 2 system like emissionwiz suggested then 007 told me to jumper wires E1 and TE1 together under the hood and count the pulses of the check engine light which I did and the light remained steady no pulse at all...I need other assistance...Please

  • bb31047 Apr 15, 2009

    Emissionwiz, first let me make sure we are talking about the same sensor ( I changed the sensor in the front of the engine attached to the front of the exhaust and a plug-in), It was a gold looking plug screwed into the exhaust about 2 inches long with a wire that pluged into a socket on the engine, that's the only one I have replaced. Now should I look at it (the plug) again or should I go to #1 spark plug and look for another sensor? Should I just change this sensor? Is their anyway to check these things, ...clean them blow them out.....they are very expensive to keep replacing and the light still stays on..I trust you know what you are talking about, but after I keep changing them and it still stays on is a little frustrating...One of the techs says it's the cat converter, and I don't even want to go there.....Price!!!!

  • bb31047 Apr 15, 2009

    Where is the heater circuit sensor located? so I can check it..I checked the sensor that I previously changed and the wiring is not damaged. I did that when I was jumping the wires for (007) that didn't do anything..Also should the heater still work if I have a blown fuse, because the heater works just fine...

  • bb31047 Apr 15, 2009

    I checked the fuses and none were blown, where is the heater sensor located so I can check it?

  • bb31047 Apr 15, 2009

    I understand a lot more now of what's not working and maybe I can try and fix it,but not a real solution, because I have already replace what he says has to be replaced....emissionwiz really knows what he's talking about.

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  • Lexus Master
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Check the wiring to sensor 1 bank sensor 1 for possible damage from the exhaust, also make sure the connector to the O2 sensor (they called it a air/fuel sensor, incorrect) is in good condition and not contaminated with oil or water intrusion into the sensor, look for corrosion on the pins, (green or white residue) since all the these codes are for the bank one sensor, if u find nothing else wrong then it is safe to say the sensor is defective, bank 1 sensor is the engine cylinder bank where # 1 spark plug is located, the sensor is before the catalytic converter, this is the rear cylinder bank as u stand in front of the car. see photo diagram.
Engine Light - 569b4cc.gif

Posted on Apr 15, 2009

  • yadayada
    yadayada Apr 15, 2009

    I noticed you replaced the sensor already so the problem is in the wiring, look carefully for wiring damaged by the exhaust pipe, check the connector pins as well, as make sure the heater circuit for the sensor has power to it, when the key (eng off) is turned on the sensor should get hot very quickly without the engine running, if it doesn't see if u have 12 volts at one of the sensors pins, if not check for a blown heater circuit fuse.

  • yadayada
    yadayada Apr 15, 2009

    the heater is inside the O2 sensor, it has a dedicated ground and 12 volt signal to operate it, that is why the quick test for the heater is turn the key on and see if the O2 gets hot, if not check for a blown fuse.

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  • Master
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Hi friend standby for a while i'll sent you how

Posted on Apr 15, 2009

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  • Joseph Baculan
    Joseph Baculan Apr 15, 2009

    There is usually a diagnostic box when u raise the bonnet. It is located at the passenger side, close to the body of the vehicle. If u open it, u will notice that there r 2 points E1 & TE1. Bridge those two and observe how the engine light flashes, ie how often after pauses. The blink between pauses represents a digit. Remember it and tell me what number u ended up with

  • Joseph Baculan
    Joseph Baculan Apr 15, 2009

    ts probably the caytalac converter some times puts the o2 sensor code ere or there is more then one o2 sensor. thanks!!!

  • Joseph Baculan
    Joseph Baculan Apr 15, 2009

    The check engine light has nothing to do with the oil, water etc. it signals that a fault has occurred in the engines electronic controls and it has failed a test of some system that the cars computer runs every few minutes while the engine is running, it can be one of a 100 different systems that made the light come on, take the car to a Kragen Auto parts store or another chain parts store like it and ask them to run a OBD 2 system test (it's free), this will retrieve the trouble code(s), post the code(s) back on this thread and I will explain what it will take to repair.

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