P0491 code definition This is the OBD-II code for Secondary Air Injection System Insufficient Flow Bank 1, indicating a problem on the side of the engine which contains cylinder #1.
What causes code P0491?
Diagnostic trouble code (DTC) P0491 stands for “Secondary Air Injection Insufficient Flow Bank 1.” It is logged once the vehicle’s powertrain control module (PCM) perceives that there is a possible issue within the SAI system. This code is logged once the PCM determines that the secondary air flow in bank 1 is too low.
How do you fix a secondary air injection system malfunction?
What repairs can fix the P0410 code?
- Replacing the air injection pump and power relay.
- Replacing O2 sensors that respond too slow as they age.
- Replacing the air injection pump intake filter clogged with debris.
How much does it cost to replace a secondary air injection pump?
How much does it cost to repair a secondary air injection system? You can expect to pay about $450 to replace your secondary air injection system. These costs are split between the cost of materials and the cost of labor. You can save money by replacing your system on your own.
What causes secondary air injection malfunction?
A faulty pump is generally the most frequent cause of the system failing. Ingress of moisture can cause damage which results in seizure of the pump. Faulty ground and voltage supply can also cause the pump to fail.
How do I fix code P0491?
What repairs can fix the P0491 code?
- Replacing any damaged wiring, connectors, or other electrical components.
- Replacing the secondary air injection pump.
- Replacing the pump’s one-way check valve.
- Repairing or replacing any damaged vacuum hoses or fittings which could be causing a vacuum leak.
- Replacing pump fuses.
How do I fix error code P2431?
What repairs can fix the P2431 code?
- Replacing the secondary air pump.
- Repairing or replacing a wiring harness.
- Resolving poor electrical connections.
Where is the secondary air injection system located?
The secondary air injection pump is usually located on the engine or at least in the engine bay. It can sometimes be hidden deep into the engine bay, but mostly you will find it installed pretty visible on the engine.
Can you drive without secondary air pump?
The system is critical to help cars achieve government emissions standards. So, the law says you need a secondary air injection system. Which begs the question: Does a car need a secondary air injection system to run? Strictly speaking, no, it doesn’t.
Where is the secondary air pump relay located?
It’s located in the electrical box in the engine bay under the right side air filter. You have to take off the entire shroud to get to it.
How much is a air injection pump?
Air Pump Replacement Cost – RepairPal Estimate. The average cost for air pump replacement is between $465 and $554. Labor costs are estimated between $77 and $97 while parts are priced between $388 and $457. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location.
What is the secondary air injection system?
Secondary air injection (commonly known as air injection) is a vehicle emissions control strategy introduced in 1966, wherein fresh air is injected into the exhaust stream to allow for a fuller secondary combustion of exhaust gases.