What does p491 mean?

Table of Contents. Error Code P0491 is defined as Secondary Air Injection System Insufficient Flow Bank 1. This means there’s a problem on the side on the engine that holds the cylinder #1, usually caused by a bad air inlet, relay, fuse, pump or faulty wires.

What does the code p0491 mean on a car engine?

The P0491 code tell there is a fault with the system – usually that the secondary air flow is too low on bank 1. Bank #1 is the side of the engine with cylinder #1. For bank #2, see code P0492.

What causes a secondary air injection pump p0491?

Potential causes for a P0491 may include: A fuse or relay for the secondary air injection pump may be faulty A leak in the hoses/piping between the secondary air injection pump and the Combi or secondary air injection A sensor for the secondary air pressure may be faulty

What to do if your check engine light is still on?

If the check engine light is still on after three days, your problem may not have been fixed or you may need to try some of the methods below to reset it. 2. Turn the Car on and off Three Times Some vehicles will automatically reset the trouble codes that caused the initial error after the vehicle is turned on and off three times in succession.

The P0491 code tell there is a fault with the system – usually that the secondary air flow is too low on bank 1. Bank #1 is the side of the engine with cylinder #1. For bank #2, see code P0492.

What does p491 mean?