Check engine light on, codes are p0507, p0403, p0421 and p0421x2
SOURCE: P0421 code on recently purchased(from dealer) 2002 RS
Hi,
So you have a P0421.
A code P0421 may mean that one or more of the following has happened:
As far as running conditions if it performs normally, you most likely need a catalytic converter. The good part of this is there shouldn't be any abnormal running conditions, so it should be fine unless the engine is running very rich for some reason. (it will usually smell badly when this happens) However, on rare occasions the cat can get hot and melt down causing an exhaust restriction..bad gas mileage, low power, and possible fire potential, but most likely this is not the case. (this is generally speaking here and covering all the bases... )
The most common thing with P0421 that the fuel injection computer detects that the cat is not performing to federal specs an need to be replaced. You will need to have it fixed before your vehicle inspection.
Good luck and I hoped this helped you.
SOURCE: check engine light does not work and i have 3
when you first turn the ignition key on all the working lights will come,if its not working could be a bulb in the dash.if its working maybe the codes are old and stored in there because no one erased them.
SOURCE: 2001 mitsubishi galant with a P0421 code whut to
this code relates to catalytic converter efficiency, could be a bad o2 sensor, bad cat , prob gonna need a mechanic to diagnose, if you do decide to replace o2 sensor you want to change the one behind cat, tghis one monitors cat function
105 views
Usually answered in minutes!
×