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Thread: P0420 Catalyst System Efficiency Below Threshold (Bank 1)

  1. #1
    Recluse Rebel Yell's Avatar
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    P0420 Catalyst System Efficiency Below Threshold (Bank 1)

    Catalyst System Efficiency Below Threshold (Bank 1)

    Causes:

    Leaded fuel was used where unleaded was called for
    A damaged or failed oxygen sensor (HO2S)
    Downstream oxygen sensor (HO2S) wiring damaged or connected improperly
    The engine coolant temperature sensor is not working properly
    Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe
    Retarded spark timing
    The oxygen sensors in front and behind the converter are reporting too similar of readings Leaking fuel injector or high fuel pressure Cylinder misfire Oil contamination

    Read more at: http://www.obd-codes.com/p0420

  2. #2
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    Trouble Code - P0420 Catalyst System Efficiency Below Threshold (Bank 1)

    A P0420 code is a trouble code on OBD-II equipped vehicles. All vehicles from 1996-newer sold in North America support this generic powertrain code. This code is a pretty common one and this site is here to help the average do-it-yourself (DIY) car owner (like you) troubleshoot, diagnose, and fix their vehicle themselves when presented with a P0420 code, saving money.

    http://www.p0420.com/

  3. #3

  4. #4
    Recluse Rebel Yell's Avatar
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    This video gives workaround detail.



    Attention: This worked for my application.

    The Capacitor:
    https://www.radioshack.com/products/...ant=5717323589

    The Resistor:
    https://www.radioshack.com/products/...ant=5717290629
    Last edited by Rebel Yell; 09-05-2016 at 06:42 AM.

  5. #5
    Recluse Rebel Yell's Avatar
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    This might be another viable work around.

    For now parts identification and overview, more about this to follow.

    This fix was going to be a 12v to .5v drop transformer, the .5v steady being well within the limits of what the computer would consider acceptable. I won't have to try this fix because the fix one post up (#4) did the trick.

    FuriousGeorge:
    Assuming you can find 13.8V power somewhere you can just use a 555 timer and set whatever frequency/duty cycle/voltage range you want. Use a LM78XX linear regulator to step down the voltage, you're talking mA or less as this sensor wasn't really driving any current.
    This one is food for thought.
    https://en.wikipedia.org/wiki/555_timer_IC
    https://en.wikipedia.org/wiki/78xx
    Last edited by Rebel Yell; 09-05-2016 at 07:01 AM.

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