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P1421 Nissan Code - Cold Start Control

- Code Popularity: 205,147 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P1421 Nissan?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • 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
⚠ Does your Nissan have Safety Recalls? → Check here

How to Fix the DTC P1421 Nissan?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code 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?

Labor: 1.0

To diagnose the P1421 Nissan code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the 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 Possible Symptoms?

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

Code P1421 Nissan Description

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.

OBDII Code P1421 Nissan - Cold Start Control - AutoCodes.com
P1421 Nissan Code - Cold Start Control

Need More Information on the Code?

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

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Code P1421 Nissan comments

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