Friday, June 1, 2012

1999 Lexus LX470: OBD CODE P1120 & 1121?

The mentioned codes are both related to faulty Accelerator Pedal Sensor.

These codes are accelerator pedal position sensor codes. Usually this is just a bad accelerator pedal position sensor. However, sometimes a dirty or bad throttle body can cause these codes. You could clean the throttle body first to see if this fixes these codes. Or you could check the voltage going to and coming from the accelerator pedal position sensor. It is possible that it is a wiring issue, but this would be rather unlikely.

The price will all depend on the shop that you bring it to and the part that has failed. A accelerator pedal position sensor is much cheaper to replace than the throttle body. A cleaning does not involve any parts except for the throttle body cleaner.. it would be just the labor to clean it.

The voltage range is going to be 0 to 5 volts. There should be two signal wires. One signal will go from about 1.0 volt slowly up to about 4.0 or 4.5 volts as the throttle is opened.

The other one will go from 4.0 or 4.5 volts down to about 1.0 volt or so as the throttle plate is open.
Be sure the voltage rises and decreases slowly and that there are no spikes or jolts in the voltage.
Also, be sure these tests are done with the key on.

This details will help.

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