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What does code P0491 mean?

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What does code P0491 mean?

Secondary Air Injection System Insufficient Flow
OBD-II Code P0491 is defined as a Secondary Air Injection System Insufficient Flow. The Secondary Air Injection System pumps outside fresh air into the Exhaust System during cold engine start up. This additional air helps burn up the highly rich exhaust emissions that are produced when the engine is warming up.

How do I fix code P0492?

Multiple repairs may be necessary to repair the P0492 code. The most common repairs are replacement of the pump and the one-way check valve. However, vacuum line leaks will also need to be repaired, and the cylinder head may need to be thoroughly cleaned of carbon build up before the code can be cleared permanently.

How do I fix code P0491?

What repairs can fix the P0491 code?

  1. Replacing any damaged wiring, connectors, or other electrical components.
  2. Replacing the secondary air injection pump.
  3. Replacing the pump’s one-way check valve.
  4. Repairing or replacing any damaged vacuum hoses or fittings which could be causing a vacuum leak.
  5. 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 code P2258?

What Repairs can Fix the P2258 Code?

  1. Repair or replace any damaged one-way check valves.
  2. Repair or replace any damaged or defective switches.
  3. Repair or replace any damaged or defective hoses or fittings.
  4. Repair or replace any damaged or defective wires and connectors.

What is code P2431?

What the P2431 code means. The secondary air injection system is used to add air into the exhaust to reduce vehicle emissions. When the the incorrect flow is detected, the electronic control unit (ECU) detects this fault and sets the P2431 code. This code causes the Check Engine Light to be illuminated on the dashboard …

How do you test a secondary air injection?

The secondary air valve can be quickly inspected in an easy way:

  1. Loosen the connecting hose on the secondary air non-return valve leading to the secondary air pump.
  2. If there are deposits on this side of the valve (finger test, see Fig.
  3. Inspect the secondary air pump and replace it if necessary.

How do I fix error code P2431?

What repairs can fix the P2431 code?

  1. Replacing the secondary air pump.
  2. Repairing or replacing a wiring harness.
  3. Resolving poor electrical connections.

What is code P2258?

The P2258 trouble code is a generic powertrain code related to fuel and air metering (air injection circuit). This code appears when the engine control module (ECM) detects higher voltage levels than are acceptable in the A circuit.

How do I fix code P2431?

How do I know if my secondary air pump is working?

The secondary air pump has to start audibly after a cold start of the engine. Start vehicle engine. If the power supply of the secondary air pump is fine, but the secondary air pump runs with a scraping, whistling or scratching noise or not at all, the secondary air pump is to be replaced.