20 Most Recent 2001 Toyota Sequoia - Page 8 Questions & Answers

Hi there:Are many reasons for these lights to turn on, usually the check engine light is the main cause, when it turns on it will turn the other lights on as well as those systems become disabled when the engine control computer sees a problem.The first step would be to retrieve the diagnostic trouble codes (DTCs) from the ECM (Engine Control Module) you can actually have this done at no charge at many of the larger autoparts stores such as Autozone or other Autoshop with OVD scanner reader. Note this code numbers and then reply here so I can help diagnose what the problem may be and what to do.Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.Thank you for using FixYa, have a nice day.

It is a fairly easy job, just watch carefully how it comes apart, take pictures if necessary. Make sure all sliders work free, so the caliper floats right, or else the new pads will wear out very fast. As long as you don't take any brake lines loose or pull the caliper pistons apart you will not need to bleed the brakes.

DTC P0125 OBD-II - Insufficient Coolant Temperature For Closed Loop Fuel Control
This means that the engine coolant temperature (ECT) sensor indicates that the engine has not reached the required temperature level to enter closed-loop operation within a specified amount of time after starting the engine. You will likely not notice any drivability problems.

A code P0125 may mean that one or more of the following has happened:
Insufficient warm up time
Low engine coolant level
Leaking or stuck open thermostat
Faulty coolant temperature sensor


DTC P0135 OBD-II - Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
This code refers to the front oxygen sensor on Bank 1. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135. You will likely notice poor fuel economy the illumination of the MIL.

A code P0135 may mean that one or more of the following has happened:
O2 Heater element resistance is high
Internal short or open in the heater element
O2 heater circuit wiring high resistance
open or short to ground in the wiring harness


For additional details, feel free to contact us in the preivous code link.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

At a certain temperature your fan should come on to take out the heat from the radiator. If this is not happening it could be the cause of the rise in temperature.

This is usually due to a broken release handle, if the handle feels loose and like there is nothing attached to it then that's the case, the handle is about $25 and the labor at the dealer around $200.

replace the eginiton control module its shorting out