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Question: P0432 Main Catalyst Efficiency Below Threshold (Bank 2)

Question

mikebusiness, Maspeth, NY, January 25, 2010, 15:55
 Rookie

P0432 Main Catalyst Efficiency Below Threshold (Bank 2)
What should I do to fix this?

4 Answers
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  • Answer #1

    Bret Bodas from RepairPal Test Shop, January 26, 2010, 11:04
     Master

    Here is some info and other similar questions asked about the P0432 DTC
    http://repairpal.com/search/p0432
    :
    Trouble Code: P0432
    Catalyst Efficiency Below Normal (Bank 2)
    Trouble Code Conditions:
    Engine speed at 1200-1700 rpm in closed loop with the throttle open for over 2 minutes, ECT Sensor more than 147ºF, MAP Sensor signal from 15.0-21.0" Hg, and the PCM detected the switch rate of the rear O2 reached 70% of the switch rate of the front O2.
    Possible Causes:
    * Air leaks in at the exhaust manifold or exhaust pipes
    * Base engine problems (high coolant or engine oil consumption)
    * Catalytic converter damaged or has failed
    * Front O2 older (aged) than the rear O2 (O2 is lazy)

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    Visitor, November 07, 2010, 07:46

    The po432 code is on it does have high coolant consumption

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    Visitor, August 14, 2011, 08:31

    I was haveing codes p0121 and p0123 with p0432, now that the TPS has been changed and a tune up has been done the p0432 has not come back and if it come back what should i repair?

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  • Medium-star Best Answer
    Visitor, April 19, 2010, 12:13

    How much would it cost to fix this problem

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  • Answer #3

    Visitor, June 06, 2010, 17:15

    replace downstream O2 Sensor

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    Visitor, March 30, 2011, 10:21

    WHAT IS THE DOWNSTREAM 02 SENSSOR

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  • Answer #4

    sammysams June 20, 2010, 16:35
     Rookie

    Replace the two front oxygen sensor

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