Rainey 5/25/2012

2006 Cadillac STS Base 8Cyl4.6L - Preventive Maintenance

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How can you tell if you need catalytic Converters?

My check engine light came on now the light went off I had the car check and was told I need catalytic converters. my check engine light has not came back on yet the code it read was P0420 and P0430 by the dealer and I had the code check again and it read P0305 -Fault Cylinder Misfire Dectected(cyylinder 5 not sure what to do Any suggestion

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  Jack 6/26/2012

  Any type of misfire (p0305 = misfiring on cylinder 5) can ruin a catalytic converter in short time. You have codes for both cylinder banks for Converter efficiency below threshold. You need to have the vehicle properly diagnosed to see what is causing the misfiring. The misfiring has most likely ruined the converters already due to the excessive heat created in the converters from the misfiring.They may not be clogged yet , but they are most likely heat damaged, which is why you have the p0420 and p0430 codes.

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  RC 6/26/2012

  Are you saying the dealer pulled trouble codes P0420, P0430 the first time? How many miles on the car, and are you the original owner?

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