AutoCodes – Generic – P1669

P1669 Code - Fuel Injector 4 Mechanical Fault

Quick Answer

The Fuel Injector is an electronically controlled mechanical device that is supplied with pressurized fuel by the fuel pump and when energized atomizes the fuel into a fine mist so that it can burn easily in the engine. Common causes include Faulty Fuel Injector, Fuel Injector harness is open or shorted, Fuel Injector 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: P1669 indicates Fuel Injector 4 Mechanical Fault.
Common causes: Common causes include Faulty Fuel Injector, Fuel Injector harness is open or shorted, Fuel Injector 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 11,854

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 May 13, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P1669 Description

The Fuel Injector is an electronically controlled mechanical device that is supplied with pressurized fuel by the fuel pump and when energized atomizes the fuel into a fine mist so that it can burn easily in the engine.
The Engine Control Module (ECM) monitors the Fuel Injector. The ECM sets the Diagnostic Trouble Code (DTC) when the Fuel Injector is not to factory specifications.

OBDII Code P1669 - Fuel Injector 4 Mechanical Fault - AutoCodes.com — P1669 Code - Fuel Injector 4 Mechanical Fault

What does this mean?

What are the Possible Causes of the DTC P1669?

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

How to Fix the DTC P1669?

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 does this mean?

Code Tech Notes

Before replacing the fuel injector, check the wire harness and/or replace harness if necessary.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1669 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 P1669 code?

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Need Help with the Code?

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Information for Specific Makes

P1669 Audi — Fuel Injector 4 Mechanical Fault
P1669 Buick — ABS Unit Expected
P1669 Cadillac — ABS Unit Expected
P1669 Chevrolet — ABS Unit Expected
P1669 GMC — ABS Unit Expected
P1669 Land Rover — Engine Control Module Cooling Fan Circuit Malfunction
P1669 Volkswagen — Fuel Injector 4 Mechanical Fault

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.