Question about Ford Mustang

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I have a 2000 Mustang GT that did not pass an emissions test. The On Board Diagnostic System came up with several Trouble codes.P0443,P1451,P0135,P0141,P0155,P0161,P1409.Could you translate what these codes refer to?

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  • DSH525 Nov 16, 2008

    thanks for your help



4 Answers

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P0443 - EVAP Control The PCM monitors the VPWR circuit open Monitor EVAPPDC PID
System Canister Purge EVAP canister purge EVAP canister purge and voltage between
Valve Circuit valve circuit for an valve circuit EVAP canister valve
Malfunction electrical failure. shorted to GND signal and PWR GND in
The test fails when Damaged EVAP output test mode with
the signal moves canister purge key ON engine OFF (or
outside the minimum or valve in key ON engine
maximum allowable EVAP canister purge RUNNING mode). EVAPPDC
calibrated parameters valve circuit open PID at 0% and voltage
for a specified purge EVAP canister purge less than 1.0 volts
duty cycle by PCM valve circuit (or EVAPPDC PID at
command. shorted to VPWR 100% and voltage
Damaged PCM greater than 0.5
volts) indicates a
hard fault.

P1451 - EVAP Control Monitors the canister VPWR circuit open - Monitor EVAPCV PID
System Canister Vent vent (CV) solenoid CV solenoid circuit and voltage between
Solenoid Circuit circuit for an shorted to PWR GND canister vent
Malfunction electrical failure. or CHASSIS GND solenoid signal and
The test fails when Damaged CV solenoid PWR GND in output
the signal moves CV solenoid circuit test mode with key
outside the minimum or open ON engine OFF (or
maximum allowable CV solenoid circuit in key ON engine
calibrated parameters shorted to VPWR RUNNING mode)
for a specified Damaged PCM - EVAPCV PID at 0%
canister vent duty and voltage less
cycle by PCM command. than 1.0 volt (or
EVAPCV PID at 100%
and voltage greater
than 0.5 volt)
indicates a hard
P0135 - HO2S Sensor During testing the Short to VPWR in - wiring.
Circuit Malfunction HO2S Heaters are harness or HO2S. - Damaged HO2S
(HO2S-11) checked for opens Water in harness heater.
/shorts and excessive connector. - Damaged PCM.
current draw. The test Open VPWR circuit.
fails when current Open GND circuit.
draw exceeds a Low battery
calibrated limit and voltage.
/or an open or short Corrosion or poor
is detected. mating terminals
and wiring
Damaged HO2S
Damaged PCM.
P0141 - HO2S Sensor See DTC (same trouble as P0135)
Circuit Malfunction
P0155 - HO2S Sensor See DTC P0135
Circuit Malfunction
P0161 - HO2S Sensor See DTC P0135
Circuit Malfunction
P1409 - EGR Vacuum This test checks the EGRVR circuit open The EGR vacuum
Regulator Solenoid electrical function of VPWR open to EGRVR regulator solenoid
Circuit Malfunction the EGRVR. solenoid. solenoid resistance is from 26
The test fails when EGRVR circuit short to 40 ohms.
the EGRVR circuit to VPWR or GND
voltage is either too Damaged EGRVR
high or too low when solenoid
compared to the Damaged PCM
expected voltage
range. The EGR system
must be enabled for
the test to be

Good luck....

Posted on Nov 13, 2008

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I was made to understand that error codes:

  • P0443 - EVAP Control System Canister/Purge Valve Circuit malfunction
  • P1451 - Secondary Air Injection system downstream flow
  • P0135 - HO2S Sensor circuit, malfunction (HO2S-11)
  • P0141 - HO2S Sensor circuit, malfunction (HO2S-11)
  • P0155 - HO2S Sensor circuit, malfunction (HO2S-21)
  • P0161 - HO2S Sensor circuit, malfunction (HO2S-21)
  • P1409 - EGR Vacuum Regulator Solenoid Circuit malfunction
Additionally, this document may be of more help to you.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.

Posted on Nov 13, 2008


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This codes refer to oxygen sensor.

Thank you... If you are not satisfied,please dont rate me...tnx for using fixya..

Posted on Nov 13, 2008

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Several of them are related to the O2 sensor, you should reset the ECU to find out what codes are active by resetting it.

Posted on Nov 13, 2008

  • Ginko
    Ginko Nov 13, 2008

    when you get all that codes at once often there is an electrical issue, and you simply need to reset the ECU, see here:

    Ford Auto Repair Information

    ODB Code help, F150 - Diesel Forum
    Regarding the error codes:

    P0443 Purge Valve Control Fault - replace the purge control valve

    P1451 EVAP Emission Control System - Check the vent solenoid's coil for continuity.

    P0135 O2 Sensor Circuit Malfunction

    P0141 bank 1 sensor heater circuit malfunction

    P0155 O2 Sensor Heater Circuit (Bank 2 Sensor 1)

    P0161 O2 Sensor Heater Circuit (Bank 2 Sensor 2)
    P1409 Electronic Vacuum Regulator (EVR) control circuit malfunction - check EGR Vacuum regulator located on the driver side of the valve cover


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we cure your trouble that caused your engine light to come on and you will pass your test.

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