[SOLVED] Dodge P0491 Code: Quick Fix For Secondary Air Injection Flow

The OBD code P0491 for Dodge indicates a Secondary Air Injection System Insufficient Flow.

This affects the AIR system.

Symptoms include the Engine Light being ON.

Causes can be an intake leak, damaged AIR system components, faulty AIR Solenoid Valve, or a faulty AIR system relay.

It’s a moderate issue.

A possible fix is to inspect the mentioned components and wiring for any damage or corrosion.

Repair Importance Level	10.0 (Out of 10)
Estimated Repair Time	Approximately 1.0 hour
Repair Difficulty Level	10.0 (Out of 10)

Symptoms of the Dodge p0491 OBD Code

The Dodge P0491 fault code typically triggers the check engine light due to secondary air injection system issues.

Symptoms: Engine Light ON.
Possible lack of power during acceleration.
May hear a loud noise from the secondary air injection system.

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Causes of the Dodge p0491 OBD Code

P0491 in Dodge vehicles typically indicates a fault in the secondary air injection system.

P0491 can be caused by an intake leak.
Damaged AIR system components.
Faulty AIR Solenoid Valve.
Faulty AIR system relay.

Fixing Dodge Error Code p0491 Step By Step

Address the fault code P0491 in a Dodge vehicle by inspecting and repairing the secondary air injection system.

To fix the Dodge OBDII code P0491, start by reviewing the possible causes mentioned above.
Visually examine the wiring harness and connectors related to the secondary air injection system.
Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
If no issues are found with the wiring and connectors, proceed to test the secondary air injection pump for proper operation.
Replace the secondary air injection pump if it is faulty.
Clear the fault codes from the vehicle’s computer using a scan tool.
Finally, perform a test drive to ensure the code does not return, indicating a successful repair.

Cost Of Fixing Dodge p0491 Fault Code

The repair for Dodge fault code P0491 typically involves diagnosing and fixing issues with the secondary air injection system.

The cost to diagnose and fix the Dodge OBD code P0491 depends on the estimated 1. 0hour repair time.

Labor rates usually range from $75 to $150 per hour, so the total cost could be between $75 and $150. Factors like shop rates and the complexity of the repair can affect the final cost.

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Details of the Dodge p0491 OBD Code

Dodge fault code P0491 relates to the Secondary Air Injection System Insufficient Flow.

Dodge OBD code P0491 means Secondary Air Injection System Insufficient Flow Bank 1. This code is triggered when the ECM detects that the flow of air injected into the exhaust system by the secondary air injection system is not at the expected level for bank 1 of the engine.

The secondary air injection system is responsible for introducing fresh air into the exhaust system to help reduce emissions during cold engine starts.

In the case of P0491, the ECM monitors the flow of air through this system and sets the code if it falls below the specified threshold for bank 1.

Mechanic’s Tech Notes

Detailed information on Dodge fault code P0491, including symptoms, causes, and diagnostic steps for resolution.

To diagnose and fix OBDII code P0491 in a Dodge, start by visually inspecting the wiring harness and connectors related to the secondary air injection system.

Look for any damage or corrosion on the components and connector pins.

Use a voltmeter to check the power and ground connections to the system.

Additionally, a scan tool can help verify the communication between the engine control module and the secondary air injection system components.

If necessary, reflash the engine control module to address any communication issues.

FAQ

1. What are the common symptoms of OBD code P0491 in a Dodge vehicle?

Common symptoms of OBD code P0491 in a Dodge vehicle include Engine Light ON and possible causes are intake leak, damaged AIR system components, faulty AIR Solenoid Valve, or faulty AIR system relay.

2. What is the typical cause of OBD code P0491 in a Dodge vehicle?

The typical cause of OBD code P0491 in a Dodge vehicle is a fault in the AIR system components, such as the solenoid valve or relay.

3. How can I diagnose and fix OBD code P0491 in my Dodge vehicle?

Diagnose and fix OBD code P0491 in your Dodge by checking for intake leaks, damaged AIR system components, faulty AIR Solenoid Valve, and relay. Inspect wiring and connectors for damage.

Wrap Up

If your Dodge is displaying OBD code P0491, you may experience poor engine performance, increased emissions, or a rough idle.

This code typically indicates a fault in the secondary air injection system, possibly caused by a faulty air pump, damaged hoses, or a malfunctioning air pump relay.

To address Dodge OBD code P0491, start by inspecting the secondary air injection system components such as the air pump, hoses, and relay for any signs of damage or wear.

Test the electrical connections and wiring harness for proper voltage and continuity.

Replace any faulty components and clear the code to see