P 0420 Code 2006 Cadillac Cts. This code number references a number that is given to you when you plug your Cadillac CTS into a OBDII scanner. Part of the gold key service you get with Cadillac.
Check the "Possible Causes" listed above.
Short Term Fuel Trim on both banks is close to normal (maybe a little rich).
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The auto repair labor rates vary widely across the country, and. This code number references a number that is given to you when you plug your Cadillac CTS into a OBDII scanner. I don't see any vacuum leaks and my coolant temp sensor appears to be working correctly.
