Jimwp55
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I have the same problem. I have replaced all 3 sensors with OEM and MAF. I had Toyota and the Lexus dealer check the problem. They say AF sensors (brand new OEM) not reading and no communication between sensors and ECU. I am still getting codes and car is burning gas like crazy. My mechanic checked for vacuum leaks and found none. I am wondering if it might be the sensor on the throttle body. My mechanic said there is a very small vacuum leak with throttle body but doesen't think that would cause the problem I'm having. Any help would be appreciated!
Things to look for with Check engine light
in 99 - 03 Lexus RX300
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I have same problem. I took the car to Lexus dealer and they say AF sensors are not communicating with the ECU. Recommended replacing the brand new Denso sensors and if that doesn't work replace Co2 sensor which I did. I also put in a new OEM MAF. Nothing has helped! I am thinking about replacing the sensor on the throttle body to see if that helps. My mechanic said he could not find any vacuum leaks. He did say there was a very small leak in the throttle body but didn't think that would cause my problem. Any help or ideas will be appreciated.