Engine-Codes - Nissan - P1421 2009 NISSAN ALTIMA SEDAN

P1421 2009 NISSAN ALTIMA SEDAN - Cold Start Control

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1421 2009 NISSAN ALTIMA SEDAN Possible Causes

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

How is the P1421 2009 NISSAN ALTIMA SEDAN code repair?

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.

Tech Notes

You can try to perform idle air volume relearn before doing anything else.

What is the cost to diagnose the P1421 2009 NISSAN ALTIMA SEDAN code

Labor: 1.0

The cost to diagnose the P1421 2009 NISSAN ALTIMA SEDAN code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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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.

Possible Symptoms

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

P1421 2009 NISSAN ALTIMA SEDAN Meaning

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.

More Information

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