Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
There is a factory service bulletin for the following Nissan models:
2007-2009 Nissan Versa
2007-2009 Nissan Versa Factory Service Bulletin OBDII Code P1421
2009-2010 Nissan CUBE
2009-2010 Nissan CUBE Factory Service Bulletin OBDII Code P1421
The cost to diagnose the P1421 Nissan code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
The P1421 code is detected when The Engine Control Module (ECM) does not control ignition timing and engine idle speed properly when engine is started with pre-warming up condition.
The Engine Control Module (ECM) controls ignition timing and engine idle speed when the engine is started with pre-warming up condition. This control promotes the activation of three-way catalyst by heating the catalyst and reduces emissions. The Diagnostic Trouble Code (DTC) will be set when the ECM does not control ignition timing and engine speed properly when the engine is started with prewarming up condition.
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Get the P1421 Nissan code diagnosed by a professional: Find a repair shop in your area