What does the code P0491 mean?
Secondary Air Injection Insufficient Flow Bank 1
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 system is also commonly called AIR, which means air-injection reaction.
What does the code P0492 mean?
What the P0492 code means. With the P0492 code, it means that the car’s computer has detected a problem with the second bank in the secondary air injection system, which is used to help reduce emissions.
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.
Can you drive with P0491?
Error Code P0491 is one of the less serious trouble codes out there. However, as with other trouble codes, it can pose potential danger to the vehicle as it can cause the vehicle to stall while driving.
How do I fix P0491 code?
How do you test a secondary air injection?
The secondary air valve can be quickly inspected in an easy way:
- Loosen the connecting hose on the secondary air non-return valve leading to the secondary air pump.
- If there are deposits on this side of the valve (finger test, see Fig.
- Inspect the secondary air pump and replace it if necessary.
How do I fix code P2258?
What Repairs can Fix the P2258 Code?
- Repair or replace any damaged one-way check valves.
- Repair or replace any damaged or defective switches.
- Repair or replace any damaged or defective hoses or fittings.
- Repair or replace any damaged or defective wires and connectors.