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Re: P0450 trouble code
Your vehicle has whats called a OBDII diagnostics setup. Just google "2001 Toyota Tacoma, OBDII trouble codes". You should get a whole page full of responses. (Type in exactly what is in exclamation marks above) Once you have codes, scroll down to PO450. Remember, whatever sensor/circuit it refers to, means there is a problem with the circuit, the sensor, ie..wiring, bad connector, bad ground, short, open, and so on. Dont just change out part without first examining the wiring and connectors first. Common sense goes a long way with this sort of troubleshooting.
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The Code P0450 indicates that the Evaporative Pressure
Sensor output value is not changing during the EVAP Monitor test and/or
the operation of the vehicle. This code uses "two trip" logic, which
means that the fault condition must be present during two successive
cold starts and vehicle operation. The sensor is mounted in the top of the gas tank near the sending unit. You would need to test the pressure sensor.
P0441 = Evaporative Emission Control System Incorrect Purge Flow. Trouble Area(s) Open or short in VSV circuit for VAP. Open or short in VSV circuit for vapor pressure sensor. Open or short in vapor pressure sensor. VSV for EVAP. VSV for vapor pressure sensor. Vapor pressure sensor. Vacuum hose cracks, holed blocked, damaged or disconnected. Charcoal canister cracked, holed or damaged. P0450 = Evaporative Emission Control System Pressure Sensor Malfunction. Trouble Area(s) Open or short in vapor pressure sensor circuit. Vapor pressure sensor. ECM.
P0450 has to do with the EVAP emissions system, specifically it is a code for the vapor pressure sensor not reading correctly. It could be the charcoal canister, the pressure sensor, a bad VSV, or a bad vacuum line. There are literally several pages worth of diagnostic information to help trouble shoot this code. This is not a do it yourself friendly deal.
If I remeber correctly there was a recall on the charcoal canister but your out of the mileage warranty. I do know that if everything checks out and a problem cannot be found than your suppose to look at the number on the computer it may need to be replaced if it matches the numbers that have been updated to resolve this issue.
P0450 deals with the Vapor Pressure Sensor, in the fuel tank vapor circuit. Buying a charcoal canister would not cure this.
Go to a Toyota dealer and tell the parts guy that you want a
Vapor Pressure Sensor.
It is on the vapor line, before the charcoal canister.
After you replace the sensor, remove the EFI fuse to clear the code.
I hope that this answers your question.
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