AutoCodes – Generic – P120A

P120A Code - Secondary Fuel Injector Bank 1 Insufficient Flow

Quick Answer

The Powertrain Control Module (PCM) monitors the Secondary Fuel Injector Bank 1. Common causes include Faulty Secondary Fuel Injector Bank 1, Secondary Fuel Injector Bank 1 harness is open or shorted, Secondary Fuel Injector Bank 1 circuit poor electrical connection. 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: P120A indicates Secondary Fuel Injector Bank 1 Insufficient Flow .
Common causes: Common causes include Faulty Secondary Fuel Injector Bank 1, Secondary Fuel Injector Bank 1 harness is open or shorted, Secondary Fuel Injector Bank 1 circuit poor electrical connection.
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 3,914

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 02, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P120A Description

The Powertrain Control Module (PCM) monitors the Secondary Fuel Injector Bank 1. The PCM sets the OBDII code when the Secondary Fuel Injector Bank 1 is not to factory specifications.

OBDII Code P120A - Secondary Fuel Injector Bank 1 Insufficient Flow - AutoCodes.com — P120A Code - Secondary Fuel Injector Bank 1 Insufficient Flow

What does this mean?

What are the Possible Causes of the DTC P120A?

Faulty Secondary Fuel Injector Bank 1
Secondary Fuel Injector Bank 1 harness is open or shorted
Secondary Fuel Injector Bank 1 circuit poor electrical connection

How to Fix the DTC P120A?

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 P120A 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 P120A code?

Need more information on how to fix the P120A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P120A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P120A Ford — Secondary Fuel Injector Bank 1 Insufficient Flow

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 P120A Code

1. What are the common symptoms of OBDII code P120A (Secondary Fuel Injector Bank 1 Insufficient Flow)?

- Common symptoms include rough idling, reduced engine performance, misfires, and potentially an illuminated check engine light.

2. What are the typical causes of code P120A (Secondary Fuel Injector Bank 1 Insufficient Flow)?

- Causes may include a clogged fuel injector, faulty fuel injector wiring, low fuel pressure, or a problem with the fuel injector control module.

3. How can I diagnose the issue related to OBDII code P120A?

- Diagnosing the issue may involve inspecting the fuel injector, checking the wiring harness for any damage, testing fuel pressure, and scanning the vehicle for other related trouble codes.

4. Can a dirty fuel system contribute to code P120A?

- Yes, a dirty fuel system can restrict fuel flow and potentially lead to insufficient flow in the secondary fuel injector of Bank 1, triggering code P120A.

5. What are some recommended repair tips for addressing code P120A?

- Repair tips may include cleaning or replacing the fuel injector, repairing any damaged wiring, ensuring proper fuel pressure, and clearing the trouble code from the vehicle's computer.

6. Is it safe to continue driving with OBDII code P120A present?

- It is not recommended to continue driving with code P120A as it can lead to further engine damage and decreased performance. It's best to address the underlying issue promptly.

7. Can a DIY enthusiast fix OBDII code P120A at home?

- Depending on the root cause, some DIY enthusiasts may be able to address code P120A at home by following repair guides and having the necessary tools and knowledge.

8. How serious is OBDII code P120A?

- Code P120A should be addressed promptly as it can impact the engine's performance and fuel efficiency. Ignoring the issue may lead to more severe problems over time.

9. Will resetting the trouble code fix OBDII code P120A permanently?

- Simply resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing code P120A. It's essential to diagnose and address the root problem.

10. Can a malfunctioning oxygen sensor trigger OBDII code P120A?

- While a malfunctioning oxygen sensor can impact fuel delivery, it is less likely to directly trigger code P120A. The issue is more commonly related to fuel injector problems or fuel system issues.