Engine-Codes - Nissan - P1421 Nissan

P1421 Nissan Code - Cold Start Control

- Code Popularity: 183,720 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
Table of contents

|What are the Possible Causes of the Code P1421 Nissan?

  • Lack of intake air volume (block air filter)
  • Fuel injection system (Clogged fuel injector or bad fuel pump)
  • Faulty Engine Control Module (ECM)
  • Reprogram ECM

|How to Fix the P1421 Nissan Code?

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.

|Code P1421 Nissan Tech Notes

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





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|What is the Cost to Diagnose the Code P1421 Nissan?

Labor: 1.0

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.

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|When is the P1421 Nissan Code Detected?

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.

|What are Code P1421 Nissan Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the P1421 Nissan Code Mean?

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.

Cold Start Control

|Need more Information on the P1421 Nissan Code?

Need more information on how to fix the P1421 Nissan code? Get Access to Factory Service Manuals

|Need Help with the P1421 Nissan Code?

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