Car us running fine, just has check engine light on
You can google these error code on the internet and usually can find them no problem
SOURCE: 2006 Altima service engine light on, code 725
Check the SPARK plug condition, and AIR gap.
Regards,DT
SOURCE: Nissan Sentra 2001 gxe with code p0420
You will need a new catalytic convertor assembly. Yours is below treshold efficiency in other words its "no good".If you have it replaced, ask the garage/dealer to give you the old one back. Its worth some cash if its full. It doesn't matter thet it failed. They are going after the mesh inside of it and that is worth some $$$$. May not be much , but better than nothing.
SOURCE: 2003 nissan murano with check engine light codes
P0420 is Catalyst System Efficiency Below Threshold - Bank 1
and
P0456 is EVAP Control System Very Small Leak (Negative Pressure Check)
SOURCE: receiving engine code p0420 on my 2005 altima 2.5 s
A p0420 code indicates a Catalytic System efficiency failure, Bank 1.
Basically, the computer is seeing reduced efficiency of the catalytic converter or one of it's components (such as an 02 sensor)
There may be a few root causes, such as a faulty oxygen sensor, faulty coolant temperature sensor, faulty converter, Large exhaust leak, or retarded (slow) timing.
SOURCE: nissan frontier 2002 failed emissions test with
CODE PO447 EVAP CANISTER VENT CONTROL VALVE CIRCUIT OPEN.POSSIBLE CAUSES. 1.HARNESS OR CONNECTORS THE SOLENOID VALVE CIRCUIT IS OPEN OR SHORTED. 2. EVAP CANISTER VENT CONTROL SOLENOID VALVE.
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