20 Most Recent 2001 Lexus RX 300 - Page 4 Questions & Answers

This code is for an air/fuel ratio sensor's heating circuit. I suggest you have the vehicle check by a professional before you start changing parts. If you do change the air/fuel sensor, make sure it is from a name brand company or the dealer.

Check the switch near the brake pedal the should be one wire coming out of it if it is disconnected reconnect it

If you are talking about the "VSC Off" light, it means that the button to disengage your cars Vehicle Stability/Skid Control" system is engaged. Press the VSC button, the system should reengage, and the light should turn off.
If you are talking about the other VSC light, it means that your car has been forced to take evasive action to avoid a dangerous situation. For example, if you are driving on an icy road, and take a turn too tight, the vehicle may be forced to apply pressure to one of the brakes to prevent the car from loosing control. In this situation the VSC indicator light will light up to alert you that the action was taken, and remind you to possibly slow down.

take the car to auto zone and get them to hook the car up to their computer. they will do it for free

have the thermostat checked for correct operation. Ensure the coolant system is full and pressure bleed to remove any air locks. Ensure that the heater control is working as if they are not used for long periods of time they tend to rust/jam up or the vacuum actuator line leaks.

Here's a link to P0125.Here's code P1155.

fuse for each side of the lights including the dipped light ,most likely a 10 amp(red) look in the fuse cover of handbook for what fuse its what

Usually its the sensor in the passenger seat that tells the system a passenger is in the car.

In all instances, disconnecting the power to the battery is a standard safety requirement that prevents a short from happening or from the car starting, depending on which part you are working on. I find that however, you will need to test the voltages in the lines to determine if the problem lies in the switch or the wiring, which leads me to say keep the battery connected. Just make sure the windows are rolled down and all doors unlocked, so that you can always get inside the car if needed to quickly.

No, timing chains can outlast the life of the car. Only a problem if it starts making noise from getting too much slack, or jumping timing. But that will probably be after the next 100,000, or more.