AutoCodes – Nissan – P1421 2006 Nissan Altima Sedan

P1421 2006 Nissan Altima Sedan Code - Cold Start Control

Quick Answer

The Engine Control Module (ECM) controls ignition timing and engine idle speed when the engine is started with pre-warming up condition. Common causes include Lack of intake air volume (block air filter), Fuel injection system (Clogged fuel injector or bad fuel pump), Faulty Engine Control Module (ECM). Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1421 2006 Nissan Altima Sedan indicates Cold Start Control.
Common causes: Common causes include Lack of intake air volume (block air filter), Fuel injection system (Clogged fuel injector or bad fuel pump), Faulty Engine Control Module (ECM).
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 7,428

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 07, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1421 2006 Nissan Altima Sedan 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 2006 Nissan Altima Sedan - Cold Start Control - AutoCodes.com — P1421 2006 Nissan Altima Sedan Code - Cold Start Control

What does this mean?

What are the Possible Causes of the DTC P1421 2006 Nissan Altima Sedan?

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

How to Fix the DTC P1421 2006 Nissan Altima Sedan?

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1421 2006 Nissan Altima Sedan code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1421 2006 Nissan Altima Sedan code?

Need more information on how to fix the P1421 2006 Nissan Altima Sedan code? Get Access to Factory Service Manuals

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1421 2006 Nissan Altima Sedan Code

1. What does OBDII code P1421 on a 2006 Nissan Altima Sedan indicate?

- OBDII code P1421 on a 2006 Nissan Altima Sedan relates to the Cold Start Control system.

2. What are the common symptoms of OBDII code P1421 on a 2006 Nissan Altima Sedan?

- Common symptoms include rough idling, difficulty starting the engine, and decreased fuel efficiency.

3. What are the possible causes of OBDII code P1421 on a 2006 Nissan Altima Sedan?

- Causes may include a faulty cold start control valve, issues with the cold start injector, or a malfunctioning air intake system.

4. How can I diagnose the OBDII code P1421 on a 2006 Nissan Altima Sedan?

- Diagnosing the code may involve checking the cold start control valve, inspecting the cold start injector, and examining the air intake system for any issues.

5. What are some repair tips for addressing OBDII code P1421 on a 2006 Nissan Altima Sedan?

- Repair tips may include cleaning or replacing the cold start control valve, testing and replacing the cold start injector, and ensuring proper functioning of the air intake components.

6. Can OBDII code P1421 on a 2006 Nissan Altima Sedan cause long-term damage if left unresolved?

- Ignoring the code can potentially lead to decreased engine performance and worsened fuel economy over time.

7. Is it safe to continue driving a 2006 Nissan Altima Sedan with OBDII code P1421 present?

- While the vehicle may still be driveable with the code, it is recommended to address the issue promptly to prevent further damage and maintain optimal performance.

8. Can a DIY enthusiast repair OBDII code P1421 on a 2006 Nissan Altima Sedan?

- Depending on the individual's skill level, some DIY repairs may be possible, such as cleaning components or replacing parts like the cold start control valve. However, complex issues may require professional assistance.

9. Are there any recalls or technical service bulletins related to OBDII code P1421 on a 2006 Nissan Altima Sedan?

- It is advisable to check with Nissan dealership or official sources for any recalls or technical service bulletins regarding this specific OBDII code for your vehicle.

10. How can I prevent OBDII code P1421 from appearing on my 2006 Nissan Altima Sedan in the future?

- Regular maintenance, including timely inspection of the cold start control system components, can help prevent the recurrence of OBDII code P1421 on your 2006 Nissan Altima Sedan.