How to replace the Air Injection Pump on Subaru Legacy?

This is a PCM-controlled secondary air injection system, which is used on turbocharged Forester models manufactured in 2006 and onwards. It functions by pumping in more air into the exhaust pipe during cold starts to help burn off unburned hydrocarbons. There are two secondary air combination valves and an electric air pump, all under the control of a PCM (Powertrain Control Module). The secondary air pump is located at the left front corner of the engine compartment. To replace it, disconnect the cable from the negative battery terminal and then take out electrical connector and hose from the pump; however three mounting bracket bolts should be removed also. In addition, this system has two secondary air combination valves. First, for replacing left valve you need to disconnect electrical connector, remove air duct, unbolt outlet pipe and remove valve. Next comes right valve that needs to be unplugged from intake manifold after having left one been removed. Then unbolt outlet pipe and remove it.

Genuine Subaru Legacy Air Injection Pump

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Subaru Legacy Pump Assembly SECD Air
Part Number: 14828AA050
$656.03 MSRP: $967.60
You Save: $311.57 (33%)
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Product Specifications
- Other Name: Pump Assembly-Secondary Air; A.I.R. Pump, Air Pump, Pump Assembly
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2007-2009 Subaru Legacy | GT, GT Limited, XT Limited | 2.5L H4 Turbo

Subaru Legacy Air Injection Pump

Subaru Legacy vehicles feature the Air Injection Pump which acts as a part of the secondary Subaru Air Injection Pump system for exhaust system fresh air insertion. Through this process the system promotes better un oxidation rates to decrease hydrocarbon (HC) along with carbon monoxide (CO) emissions. Engine temperature and overall conditions determine when the system sends pressurized air from either an electric or belt-driven Legacy Air Injection Pump to exhaust ports and catalytic converter. From the beginning of the warm-up period until the engine reaches normal operating temperature the air control valve functions to prevent emissions from an air/fuel mixture that is too rich by pumping air into the manifold. When engines achieve their regular operating temperature the catalytic converter starts receiving the air flow because of system redirection. One-way check valves protect the Subaru Legacy Air Injection Pump from exhaust gas damage within the system while the diverter valve steers air during deceleration to stop backfires. Inspections of hoses together with valves during regular maintenance check-ups help preserve system efficiency and avoid both environmental and fuel economy complications.

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Subaru Legacy Air Injection Pump Parts Questions & Experts Answers

Pump Assembly SECD Air
14828AA050
Q: How to replace the Air Injection Pump on Subaru Legacy?
A:
This is a PCM-controlled secondary air injection system, which is used on turbocharged Forester models manufactured in 2006 and onwards. It functions by pumping in more air into the exhaust pipe during cold starts to help burn off unburned hydrocarbons. There are two secondary air combination valves and an electric air pump, all under the control of a PCM (Powertrain Control Module). The secondary air pump is located at the left front corner of the engine compartment. To replace it, disconnect the cable from the negative battery terminal and then take out electrical connector and hose from the pump; however three mounting bracket bolts should be removed also. In addition, this system has two secondary air combination valves. First, for replacing left valve you need to disconnect electrical connector, remove air duct, unbolt outlet pipe and remove valve. Next comes right valve that needs to be unplugged from intake manifold after having left one been removed. Then unbolt outlet pipe and remove it.