Question about 1999 Lexus ES 300

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The VSC and Check engine light turn on for lexus 1999 the cood is p0500

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Toyotas and Lexus cars have some unique feaures. If your fuel cap is loose or the O2 sensors on the exhaust are faulty this results in an emission problem and the engine computer unit (ECU) engages the check engine light and disables the VSC (the VSC light comes on to warn you that it has been disabled). However you have p0500 code which says the car has no speed sensor signal. The seed sensor is located on the side of the final drive from the transmission and its job is to measure the speed of rotation of the output shaft. The ECU will compare the signals from this shaft along with the speed sensors in the wheel hubs. If there is a difference between these signals the VSC is engaged to apply braking effort to which ever wheel is slipping (running faster) than the other or that the transmission speed sensor would warrant.
So you either have an emission fault has fed back to the VSC and speed sensor missing (p0500) condition, or you have a faulty sped sensor which has tripped the VSC light and in turn the CEL.
Check your fuel filler cap is on tight, turn radio off and disconnect the negative lead to the battery for 5 minutes (this should clear the ECU memory of the code error). If p0500 error and CEL and VSC lights come back on then check the electrical connection to the speed sensor. Ensure it is clean and making a good contact, check the wiring for continuity. If everything else looks good consider changing the speed sensor.

Posted on Sep 14, 2010

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Hi, i do'nt have es 300, but, i got the codes for a 1999 lexus GS 300 and code 0500 is the (VSS VEHICLE SPEED SENSOR, CIRCUIT MALFUNCTION. sometimes the codes and the equipment is the same. if your using a reader only sometimes these are not accurate. gerry

Posted on Sep 14, 2010

  • farmerm21 Nov 04, 2010

    I have a GS 300 and my code is P1349 and my engine light is on, vsc

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