P0128 is coolant thermostat problem Question 1: if i change the thermostat will that fix that problem?.............
p0505 is Idle air contro system fault Question 2: where is this located and how do i fix it ?............
p126 is magnetic clutch circuit fault Question 3: is the same where is it located and what and how can i fix it ?..................
SOURCE: 06 Corolla Pressure Control Solenoid D Electrical Fault
There is a technical service bulletin to correct this condition. Replacement of the car's Electronic Control Unit (the computer) will cure this. Take it to a Toyota dealer and have them replace it for free.
SOURCE: 2004 Sequoia. VSC TRAC, TRAC OFF, and Check
It is not hard to change the sensor, it just screws into a threaded hole. The light will not go out immeditaly, after the sensor is replaced. It needs to go thru a drive cycle. Your best bet is to replace the sensor and get the code cleard by whoever scanned it for the 0031 code.
SOURCE: 2001 Toyota Sequoia is showing a P0505 and PO420
P0505 Idle Control System Malfunction
IACV or Idle Air Control Valve if equipped is malfunctioning.
P0420 Catalyst System Efficiency Below Threshold (Bank #1)
The Catalytic converter is not working up to par in Bank#1.
I think this will point you in the right direction..
Trouble Code: P0128
Thermostat Range/Performance
Trouble Code Conditions: DTC P0107, P0108, P0112, P0113, P0116-118, P0335, P0336, P0300-P0306, P0401, P0505, P1106-P1108, P1259 and P1519, engine running at road load for 10 minutes, and the PCM detected the ECT sensor input did not reach the correct closed loop value. Note: It is possible for this code to set if the engine is left running while the hood is open for an extended period in a warm climate.
Possible Causes:
Inspect for low coolant level or for an incorrect coolant mixtureCheck the operation of the thermostat (it may be stuck open)TSB 01-064 (9/11/01) contains a repair procedure for this code
Take note of the blurb regarding NISSAN products below
A code P0128 may mean that one or more of the following has happened:
Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
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