Trouble code P0420 means:Catalyst system efficiency below threshold (bank 1)
Code PO420 is catalytic converter efficiency low bank 1
Well, honey, to clear the code on a Cadillac Eldorado 1999 for the service stability system, you'll need a fancy OBD-II scanner. Plug that bad boy in, find the option to clear codes, and let it work its magic. Just remember, clearing the code won't fix the underlying issue causing the stability service light to come on, so you might want to get that checked out too.
DISSCONECT YOUR BATT FOR 10 seconds...........there you have it
hold off and warmer button at same time on heater controls
catalyst system fault
Do didn't say which engine you have. The trouble code PO420 is telling you there is a catalystic converter not doing it's job. We need to know which engine and what year you have in order to determine which cat is at fault.
It's Catalyst system efficiency below threshold
Cylinder 8 misfire detected Often the front coil pack failing. Burning up the #8 sparkplug is a common indicator.
P0071-Ambient Air Temp. Sensor Range/Performance
Trouble code P0603 means:Internal control module,keep alive memory (KAM) error
haynes techbook automotive computer code electronc engine managament system
Hi The Transmission Input Sensor is inside the transmission (12hrs labor) The speed sensors are on the wheel hubs (one on each front wheel) Reset the code is cheaper....