2003 NISSAN ALTIMA 2.5 SL

Question

SERVICE ENGINE SOON LIGHT IS ON CODES ARE P0420, P1456 & P0442 I HAVE ALREADY CHANGED BOTH THE OXYGEN SENSORS, BOTH CATALYST CONVERTERS BUT STILL THE THE LIGHT IS ON...........PLEASE SUGGEST.

Answer 1

Hi there,

P0420 indicates an issue with the catalyst converter. Here is a list of possible causes.

P0420 NISSAN - Catalyst System Efficiency Below Threshold Bank 1

Read more: https://www.autocodes.com/p0420_nissan.html

P1456 and P0442 indicate an issue with the EVAP system. Here is some info for these codes.

P1456 NISSAN - Evaporative Emission Control System Leak Detected Small Leak

Read more: https://www.autocodes.com/p1456_nissan.html

P0442 NISSAN - EVAP Control System Leak Detected Small Leak

Read more: https://www.autocodes.com/p0442_nissan.html