Question about 2007 Ford Focus (3 Door) Hatchback

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Fixes for 2007 ford focus trouble cdes P0410 and P0491

Secondary air pump is not getting power. relay and fuse are good. Does power go through the one way valve.

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3 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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walesarumi
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SOURCE: hi i hava two code

Hello,

P0491 is a Secondary Air System fault Bank 1.

Bank 1 refers to the passenger side off the engine. The combination valve for secondary air injection did not preform as it should & set a fault. The valve is located under the plastic engine cover at the rear of the right cylinder head.

There is a plastic tube from the air pump to the valve that breaks, the valve sometimes fails, there is a vacuum hose that opens the valve that also sometimes fails & rarely the Air Injection Vacuum Control Solenoid Valve fails. The plastic tube unpluged/cracked or failed valve are the 2 most common failures.

If it's a vac leak it's in the small hose from the solenoid valve to the combination valve. The super charger may affect the vacuum, but I would expect to see more codes if it was really messing with things. The air injection system only runs for about 1.5 minutes on cold starts. If the plastic tube is broken you will hear what sound like a small exhaust leak.

P0410

What does that mean?

The P0410 code refers to the emissions system. The AIR pump puts air to the exhaust to lower emissions. It takes in outside air and pumps it through two one-way check valves into each bank of the exhaust.

About 90% of the time that this code is set, the one-way check valves have worn out or failed and allow water (which occurs naturally in the exhaust) back into the pump. In any cold climate, especially in climates with higher humidity, this water may be more excessive. The water partially fills the AIR pump, it can then freeze. When the PCM commands the pump on, if the pump is frozen it cannot turn, thus overloading the circuit and "popping" the fuse.
Symptoms

Possibly symptoms include:

* MIL illumination obviously
* Hesitation on acceleration
* Noise from a bad/stuck AIR pump

Causes

A code P0410 may mean that one or more of the following has happened:

* Water may have collected in the AIR pump or the vent solenoid and frozen or corroded the pump
* Blown AIR pump fuse due to freezing up

Possible Solutions

Note: There is a technical service bulletin (TSB) regarding this code for a number of GM models. The TSB calls for the replacement of the AIR pump and the installation of a new secondary injection hose.

Additionally, if you simply replace the AIR pump the problem may return again (and again). If you replace the pump, also clean out the hoses and replace the one-way check valve. In a few cases, people have put a small hole in the rubber cover on the pump which allows any water to drain out.

Also, please note that this may be covered under the emissions warranty on the vehicle. If your vehicle is out of bumper-to-bumper warranty, check if the emissions warranty is still valid!

* Replace the AIR pump AND one-way check valve
* Test and clean the AIR pump AND test and replace the one-way air check valve
* Replace the AIR pump inlet hose
* Replace the AIR pump fuse (found under the hood)

The above are the interpretation of the codes.

Let me know if you need further assistance.

Regards.

Posted on Sep 15, 2011

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  • 468 Answers

SOURCE: Diagnostic trouble codes P0410, P0491 and P2257

I believe it could be a faulty oxygen sensor or blocked air tubes. Check to make sure air pump is operating.Check green and black wires between pcm and pump relay. Check for 12v power between these two wires with key on check the wires for damage as this has been a problem area on these vehicles. Hope this helps.

Posted on Jan 12, 2014

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First check the fuses and relays for the secondary air
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Mar 05, 2014 | Ford Focus Cars & Trucks

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Diagnostic trouble codes P0410, P0491 and P2257


I believe it could be a faulty oxygen sensor or blocked air tubes. Check to make sure air pump is operating.Check green and black wires between pcm and pump relay. Check for 12v power between these two wires with key on check the wires for damage as this has been a problem area on these vehicles. Hope this helps.

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2009 Ford Fusion SE 2.3L error codes P0491 and P0410. What are these and what steps do I need to take to fix them. Is there any diagrams or can someone specifically tell me the steps and places to look to...


Both of those codes refer to a problem with the secondary air system (air pump). The P0491 refers specifically to bank 1. Both codes are generic in nature and don't tell you anything specific about the problem so the whole system has to be troubleshooted. Look for damaged hoses or vacuum lines off for starters.

Aug 14, 2013 | Cars & Trucks

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Hi i hava two code im ford focus 2007 p0491 and p0410 no can fix what doin


Hello,

P0491 is a Secondary Air System fault Bank 1.

Bank 1 refers to the passenger side off the engine. The combination valve for secondary air injection did not preform as it should & set a fault. The valve is located under the plastic engine cover at the rear of the right cylinder head.

There is a plastic tube from the air pump to the valve that breaks, the valve sometimes fails, there is a vacuum hose that opens the valve that also sometimes fails & rarely the Air Injection Vacuum Control Solenoid Valve fails. The plastic tube unpluged/cracked or failed valve are the 2 most common failures.

If it's a vac leak it's in the small hose from the solenoid valve to the combination valve. The super charger may affect the vacuum, but I would expect to see more codes if it was really messing with things. The air injection system only runs for about 1.5 minutes on cold starts. If the plastic tube is broken you will hear what sound like a small exhaust leak.

P0410

What does that mean?

The P0410 code refers to the emissions system. The AIR pump puts air to the exhaust to lower emissions. It takes in outside air and pumps it through two one-way check valves into each bank of the exhaust.

About 90% of the time that this code is set, the one-way check valves have worn out or failed and allow water (which occurs naturally in the exhaust) back into the pump. In any cold climate, especially in climates with higher humidity, this water may be more excessive. The water partially fills the AIR pump, it can then freeze. When the PCM commands the pump on, if the pump is frozen it cannot turn, thus overloading the circuit and "popping" the fuse.
Symptoms

Possibly symptoms include:

* MIL illumination obviously
* Hesitation on acceleration
* Noise from a bad/stuck AIR pump

Causes

A code P0410 may mean that one or more of the following has happened:

* Water may have collected in the AIR pump or the vent solenoid and frozen or corroded the pump
* Blown AIR pump fuse due to freezing up

Possible Solutions

Note: There is a technical service bulletin (TSB) regarding this code for a number of GM models. The TSB calls for the replacement of the AIR pump and the installation of a new secondary injection hose.

Additionally, if you simply replace the AIR pump the problem may return again (and again). If you replace the pump, also clean out the hoses and replace the one-way check valve. In a few cases, people have put a small hole in the rubber cover on the pump which allows any water to drain out.

Also, please note that this may be covered under the emissions warranty on the vehicle. If your vehicle is out of bumper-to-bumper warranty, check if the emissions warranty is still valid!

* Replace the AIR pump AND one-way check valve
* Test and clean the AIR pump AND test and replace the one-way air check valve
* Replace the AIR pump inlet hose
* Replace the AIR pump fuse (found under the hood)

The above are the interpretation of the codes.

Let me know if you need further assistance.

Regards.

Sep 15, 2011 | Ford Focus Cars & Trucks

1 Answer

P0410 & P0491 code, what can I do to fix the problem?


this is an obd2 trouble code table, it can help you understand the meaning of code.
for p0410, you can try:
please note that this may be covered under the emissions warranty on the vehicle. If your vehicle is out of bumper-to-bumper warranty, check if the emissions warranty is still valid!
Replace the AIR pump AND one-way check valve
Test and clean the AIR pump AND test and replace the one-way air check valve
Replace the AIR pump inlet hose
Replace the AIR pump fuse (found under the hood).

Aug 01, 2011 | 2007 Ford Fusion I4 SEL Sedan

2 Answers

I have the following codes po410 and po491.......can u please tell me what they are so I can get my car fixed asap


P0410 - SECONDARY AIR INJECTION (AIR) SYSTEM
P0491 - SECONDARY AIR INJECTION (AIR) SYSTEM INSUFFICIENT FLOW (BANK 1)

Secondary air injection (trademarked as Air Injection Reactor) is a process where fresh air is injected into the exhaust system to allow for a fuller combustion of exhaust gasses.

The possible causes are:
SAIR pump low or now air flow
SAIR bypass solenoid leaking/blocked or stuck open/closed
SAIR diverter valve leaking/blocked or stuck open/closed
SAIR air hose restriction
SAIR vacuum hose restriction or leaking

Check to make sure your air filter isn't dirty - and replace if needed. Otherwise I would suggest having your local trusted auto repair facility diagnose and repair the issue. A scan tool will be needed to properly diagnose the issue.

May 27, 2011 | 2006 Ford Focus

1 Answer

Hi, i have a problem with my 2006 ford focus, the check engine ligth is on , and when i start the car on the mornig ,I see that this is not good, I hear a noise, and the car almost dies,i have 3 codes, ...


All three of these error codes point to the secondary air injection pump
This pump pumps air into the exhuast only when warming up... hence the light when you start the car.
Check that the pump runs for about 30 seconds when you start the car cold.
Be sure the wiring to the pump is not damaged.
The pump is controlled by a relay, check that the relay is working

May 20, 2011 | Ford Focus Cars & Trucks

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