AutoCodes – Nissan – P1421 2007 Nissan Sentra

P1421 2007 Nissan Sentra 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 2007 Nissan Sentra 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,651

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1421 2007 Nissan Sentra 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 2007 Nissan Sentra - Cold Start Control - AutoCodes.com — P1421 2007 Nissan Sentra Code - Cold Start Control

What does this mean?

What are the Possible Causes of the DTC P1421 2007 Nissan Sentra?

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 2007 Nissan Sentra?

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 2007 Nissan Sentra 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 2007 Nissan Sentra code?

Need more information on how to fix the P1421 2007 Nissan Sentra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1421 2007 Nissan Sentra code diagnosed by a professional: Find a repair shop in your area

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 2007 Nissan Sentra Code

1. What does OBDII code P1421 on a 2007 Nissan Sentra indicate?

The P1421 code on a 2007 Nissan Sentra relates to the Cold Start Control system.

2. What are the common symptoms of OBDII code P1421 in a 2007 Nissan Sentra?

Common symptoms of P1421 may include rough idling, difficulty starting the engine, and decreased fuel efficiency.

3. What are the possible causes of OBDII code P1421 in a 2007 Nissan Sentra?

Potential causes of P1421 include a faulty cold start control valve, issues with the cold start control system wiring, or a malfunctioning ECM (Engine Control Module).

4. How can I diagnose the OBDII code P1421 on my 2007 Nissan Sentra?

To diagnose P1421, you may need to perform a visual inspection of the cold start control system components, check for any loose or damaged wiring, and use an OBDII scanner to retrieve freeze frame data.

5. Can I still drive my 2007 Nissan Sentra with the OBDII code P1421?

It's not recommended to drive your vehicle with an unresolved P1421 code, as it can lead to poor engine performance and potential further damage.

6. How can I repair OBDII code P1421 on a 2007 Nissan Sentra?

Repairing P1421 may involve replacing the cold start control valve, repairing any damaged wiring, or reprogramming the ECM if necessary.

7. Is it safe to reset the OBDII code P1421 on a 2007 Nissan Sentra without fixing the underlying issue?

Resetting the code without addressing the underlying problem may temporarily clear the check engine light, but the issue will likely reappear, and it's best to resolve the root cause.

8. How much does it typically cost to repair OBDII code P1421 on a 2007 Nissan Sentra?

The cost of repairing P1421 can vary depending on the specific cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

9. Can a DIY enthusiast fix OBDII code P1421 on a 2007 Nissan Sentra?

Depending on your skill level and access to tools, DIY enthusiasts may be able to address simpler causes of P1421, such as checking and replacing the cold start control valve or inspecting wiring.

10. How often does OBDII code P1421 occur in a 2007 Nissan Sentra?

P1421 is not a common code on a 2007 Nissan Sentra, but it can still occur due to various factors affecting the cold start control system.