96 taurus code 0420

Discussion in 'Domestics' started by taurus96, Mar 27, 2009.

  1. taurus96

    taurus96 Newbie

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    I have a 96 Taurus 3. 0 DOHC motor. It has 116,000 miles on it and the inspection is due in July and I would like to get this problem solved. I have a code 0420. Catalytic low efficiency bank 1. What is the best way to go about fixing this problem. What are the normal voltages for the o2 sensors. Also there is a exhaust leak in the flex pipe. This is after the converters. Would this make a problem like this.
    I can get all the monitors to go into ready mode except the cat one with the check engine light out. According to NY inspection law on a car older than a 2000 you are allowed 3 monitors to not be ready and pass. Will I pass with this monitor not ready.

    I also need to replace the intake manifold runner control. Would this affect the car.
     
  2. kev2

    kev2 wrench

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    first...fix the manifold controller problem ....are you sure there is not a code for that.....its in the p15xx area?? wHat type scanner??....Could be your code reader islimited to generic @ (p0001-p0999)

    asfar as a monitor not ready worry about the CEL.............

    Link is a great article by one of the techs here at BAT read it...

    http://www.troublecodes.net/articles/catfailure/
     
  3. crunch

    crunch wrench

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    Yes as said fix the intake runner problem.
    And check TSB's on code.
    After that.
    Next thing check the tune up end.
    A lot of cat codes can be engine not running right.


    http://www.troublecodes.net/articles/gmmsundrstd42.shtml


    DTC P0420, P0421, and P0430 & P0431: Check Possible Cause Of Misfire DTC P0420 and P0421 indicate bank one catalyst system efficiency is minimum requirement. DTC P0430 and P0430 indicate bank 2-catalyst system efficiency is minimum requirement. Possible causes are as follows: Use of leaded fuel. Oil contamination. Cylinder misfire. Fuel pressure too high. HO2S sensor improperly connected. Damaged exhaust system component. Faulty ECT sensor. Faulty HO2S. Ensure ignition timing is correct. Retrieve all Continuous Memory DTCs. If misfire code is not present, go to next step. If misfire code is present, isolate cylinder and repair as necessary. Check HO2S Monitor DTCs If DTCs P0136, P0138, P0140, P0141, P0156, P0158, P0160, or P0161 were present in step 1), service as necessary before continuing. If none of these codes are present in step 1), go to next step. Check ECT Sensor DTCs If DTCs P0117, P0118, P0125 or P1117 were present in step 1), service as necessary before continuing. If none of these codes are present in step 1), go to next step. If any codes except P0420, P0421, P0430 and/or P0430 were present in step 1), service as necessary before continuing. If no codes except P0420 and/or P0430 were present in step 1), go to next step. Check Rear HO2S Wiring Harness Turn ignition off. Ensure HO2S wiring harness is correctly routed and connectors are tight. Repair or replace as necessary. If wiring harness and connectors are okay, go to next step. Check Fuel Pressure Turn ignition off. Release fuel pressure. Install fuel pressure gauge. Start engine and allow to idle. Note fuel pressure gauge reading. Increase engine speed to 2500 RPM and maintain for one minute. For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to CIRCUIT TEST HC. Check For Exhaust System Leaks If exhaust system leaks, it may cause catalyst monitor efficiency test to fail. Inspect exhaust system for cracks, loose connections or punctures. Repair or replace as necessary. If exhaust system is okay, go to next step. Check For Exhaust System Restrictions Inspect exhaust system for collapsed areas, dents or excessive bending. Repair or replace as necessary. If exhaust system is okay, go to next step. Check Manifold Vacuum Install tachometer. Connect vacuum gauge to intake manifold vacuum source. Start engine and raise engine speed to 2000 RPM. Manifold vacuum should rise to more than 16 in. Hg. If manifold vacuum is okay, go to next step. If manifold vacuum is low, go to step 11). Leave tachometer and vacuum gauge connected. Start engine and raise engine speed to 2000 RPM. On a non- restricted system, manifold vacuum should quickly rise to normal range as increased RPM is maintained. On a restricted system, manifold vacuum will slowly rise to normal range as increased RPM is maintained. If manifold vacuum is okay, no indication of exhaust leak or restriction has been detected and testing is complete. If manifold vacuum is low or slow to respond, go to next step. Leave tachometer and vacuum gauge connected. Remove exhaust pipe from exhaust manifold. Start engine and raise engine speed to 2000 RPM. If manifold vacuum is now okay, fault is downstream from exhaust manifold. Reconnect exhaust pipe to exhaust manifold and go to next step. If manifold vacuum is still low or slow to respond, fault is in exhaust manifold or intake manifold gasket. Repair or replace as necessary and repeat QUICK TEST. Leave tachometer and vacuum gauge connected. Disconnect muffler/tailpipe assembly from rear of catalytic converter. Start engine and raise engine speed to 2000 RPM. If manifold vacuum is now okay, fault is in muffler/tailpipe assembly. Repair or replace as necessary and test-drive vehicle to verify elimination of symptom. If manifold vacuum is still not okay, fault is in catalytic converter. Repair or replace as necessary. Check tailpipe/muffler assembly for debris from catalytic converter. Test drive vehicle to verify elimination of symptom.
    http://esupport.sony.com/


    Good Luck and let us know how it goes.
    Crunch
     
  4. taurus96

    taurus96 Newbie

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    Yes I was getting the code for the IMRC. I disconnected the wiring to see if it would still throw a code and if it affected the 0420. It was for the runners on bank one staying open. When I opened up the box the gear on the servo was broken. The butterfly's move freely.
    I figured with the computer thinking the butterfly was open it was getting a lean condition and then it would richen the mixture thus the 0420.
    I also got a code for lean mixture. I forget the number I have to check the scanner. I use an actron cp9145. It has generic and specific models.
     
  5. taurus96

    taurus96 Newbie

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    Just got done putting th IMRC in. Car seems to run a little smoother at higher speeds.
     

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