Question about 2005 Cadillac CTS
CHECK ENGINE LIGHT ON CODE READ PO420
Most of the time its the sensor that cause this,id try replacing the sensor on it,that usually fixes that code,but you have to get the code cleared off with a scanner ,and then re-scan it to make sure it doesn't come up again,good luck with it.
Posted on Jul 02, 2008
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Posted on Jan 02, 2017
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