Can P0300 cause p0420?
p0300 is a random misfire this doesnt mean replace the engine it likely needs spark plugs replaced at that mileage and that can cause the p0420 code which may have also caused the previous owner to have to replace the cats as he ignored a misfire that caused raw fuel to dump into the exhaust which will burn up cats …
What does P0420 mean on a Cadillac catalytic converter?
P0420 CADILLAC Tech Notes As the code description implies the P0420 code means that the vehicle’s control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting).
What does the Diagnostic Code mean on a Cadillac P0300?
Basically this means that the the car’s computer has detected that not all of the engine’s cylinders are firing properly. A P0300 Cadillac diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring.
Where does the P0420 trouble code come from?
P0420 is triggered in the engine control module when there is a problem with the efficiency of the catalytic converter. The engine control unit uses two O2 sensors, one in the front of and one behind the catalytic converter to measure the efficiency of the catalytic converter.
Can a damaged catalytic converter trigger the code po420?
Yes, they can, but not in the way you think. Rich or lean mixtures can damage the catalytic converter, and when the catalytic converter is damaged/filled with fuel, the efficiency will be low, and the rear O2 sensor will see that and show the trigger the code Po420.
Basically this means that the the car’s computer has detected that not all of the engine’s cylinders are firing properly. A P0300 Cadillac diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring.
P0420 CADILLAC Tech Notes As the code description implies the P0420 code means that the vehicle’s control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting).
Why do I have a trouble code P0420?
When attach a trouble code reader and come up with a P0420, your first assumption may be that you need a new catalytic converter, simply because the words catalytic converter are mentioned in the code. After the tests you may indeed discover that the catalytic converter is bad.
What does the P0300 code on a DeVille mean?
P0300 is a general and random misfire code, which means that the code is not going to tell you which cylinder is causing the misfire. Something is causing cylinders to misfire at random, which is a lot less cut and dry than a cylinder specific misfire code. See Also: P0300 Cadillac OBDII Code DeVille P0300 OBDII Code Symptoms