P2445: How to Diagnose & Fix — Secondary Air Injection System Pump Stuck Off Bank 1
7 vehicles · 3 makes · $200-$4,000 repair
How to diagnose and fix P2445: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Toyota Tundra · 2005–2013
The secondary air injection pump is prone to failure due to water intrusion. The electric motor is located in the wheel well with moisture exposure, and the rubber boot covering the motor traps water, causing the pump to short circuit. This triggers check engine lights with codes P2440, P2443, P2445, P2447, P0418, or P0419. Some vehicles may enter limp mode.
Common Symptoms
- Check engine light illumination
- Jet engine noise on cold startup
- Decreased fuel economy
- Limp mode activation
- Rough idle when cold
How to Fix
Toyota issued a service bulletin for 2007-2010 models covering replacement of the entire air injection system. Repair costs range from $2,000-$4,000 for OEM replacement. Some owners opt for aftermarket bypass kits with block-off plates.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Toyota 17610-0S010 genuine secondary-air pump assembly
replace the corresponding pump only when active testing and the applicable Toyota program identify it as failed Fitment/availability: Cataloged for selected 2007-2013 Tundra applications; exact engine, side/quantity, DTC branch, VIN and …
- Toyota 17610-0S030 genuine secondary-air pump assembly
replace the program-matched pump after active-test confirmation, with all required valves, inlets, gaskets and calibration handled separately Fitment/availability: Cataloged for selected 2012-2021 4.6L/5.7L applications; on this card use…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
- TipDIY repairs can save significantly - dealer charges $2,000-$4,000 but DIY costs are typically 50-70% less
- TipConsider OEM parts for critical components like sensors and electrical parts - aftermarket can be unreliable
- TipGet a proper diagnosis before replacing parts - similar symptoms can have different causes
Toyota Sequoia · 2008–2019
2nd-gen Sequoias with the 5.7L 3UR-FE also suffer from secondary air injection pump failures, similar to the 1st gen but with updated part numbers. The pump seizes from internal moisture corrosion, triggering P2440-P2445 codes and check engine light.
Common Symptoms
- Check engine light with P2440-P2445 codes
- Loud buzzing or grinding on cold start
- Air pump not engaging on startup
- Failed emissions test
How to Fix
Replace secondary air injection pump (Toyota 17610-0S010 or Dorman 306-058). Replace air switching valves if corroded. Aftermarket pumps are available at lower cost. Some owners install check valves in the air line to prevent moisture backflow into the pump.
Toyota 4Runner · 2005–2009
The 4.7L 2UZ-FE V8 used in later 4th-generation 4Runners is known for secondary air injection system failures involving the air pump and switching valves. When the system sticks or fails electrically, the truck may illuminate the check engine light and enter reduced-power or limp mode. This problem is widely documented across Toyota V8 trucks and SUVs of the era and can be very expensive when repaired with OEM components.
Common Symptoms
- check engine light
- reduced power or limp mode
- poor acceleration
- cold-start noise from air pump area
- traction and VSC lights illuminated with CEL
How to Fix
Scan for stored air injection codes and verify pump operation, valve movement, and moisture intrusion in the system. Repair usually requires replacing one or both air pumps and/or switching valves, plus related hoses or control components. Some owners use aftermarket bypass modules for off-road or out-of-warranty vehicles, but emissions legality varies by location.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Toyota 17600-0F010 secondary-air pump assembly
pump branch only when command, power, pressure and debris inspection confirm failure Fitment/availability: 2005-2009 Toyota 4Runner 4.7L 2UZ-FE bulletin branch; broader catalog fitment does not justify use without code-directed pump test…
- Genuine Toyota 25710-50022 secondary-air switching/check valve
main switching-valve branch only after the bulletin test identifies valve failure or debris damage Fitment/availability: 2005-2009 Toyota 4Runner 4.7L 2UZ-FE bulletin branch; supersedes 25710-50020 and 25710-50021 Fitment/availability: s…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Toyota FJ Cruiser · 2010–2014
Toyota Tacoma · 2005–2011
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P2445 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P2445 mean?
P2445 stands for "Secondary Air Injection System Pump Stuck Off Bank 1." This generic emissions code means the secondary air injection (AIR) pump on bank 1 is not moving air when commanded to during cold-start operation. The secondary air system briefly pumps fresh air into the exhaust at startup to help burn off the rich cold-start mixture and reduce emissions, and the PCM detects no airflow or pump activity. It is primarily an emissions/inspection concern and rarely affects how the car drives, though it should be repaired to pass smog testing.
What are the most common causes of P2445?
The most common causes of P2445 are: Failed or seized secondary air injection pump, Moisture/corrosion seizing the pump (failed check valve), Faulty air pump relay or blown fuse, Damaged wiring or connector to the pump, Clogged or disconnected air hose, Stuck secondary air control/check valve, Faulty PCM driver circuit (rare). The specific cause varies by vehicle.
How much does it cost to fix P2445?
Repair costs for P2445 range from $200 to $4,000, depending on the vehicle and root cause.
Which vehicles are affected by P2445?
Au7o has documented P2445 across 7 vehicle models from 3 manufacturers: Lexus, Subaru, Toyota.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.