P2441 on Toyota: How to Diagnose & Fix
Secondary Air Injection System Switching Valve Stuck Closed (Bank 1)
4 Toyota models · 5 documented issues · 2 critical · $300-$3,000 repair
P2441 on Toyota by model: symptoms, diagnosis and fix
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.
The secondary air injection system on the 200 Series Land Cruiser (3UR-FE and later engines) fails due to moisture intrusion and corrosion of the air switching valves and pump motor. The system pumps air into the exhaust manifold during cold starts to reduce emissions. When it fails, it triggers check engine lights and can prevent the vehicle from passing emissions testing.
Common Symptoms
- Check engine light on cold starts
- Rough idle for first 30-60 seconds
- Whirring noise from engine bay on startup
- Failed emissions inspection
- Multiple air injection fault codes
How to Fix
Replace the air injection pump, air switching valves, and check valves. Clean or replace corroded wiring connectors. Some owners delete the system entirely with aftermarket tune, though this prevents passing emissions in tested states. Toyota TSB-0111-10 addresses the updated valve design.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Toyota 17610-0S010 genuine secondary-air pump assembly
early pump branch, replacing only the unit proven failed by command and electrical/flow testing Fitment/availability: VIN- and production-date-confirmed 2008 through early-2013/2014 Land Cruiser 3UR-FE branch; catalog requires quantity t…
- Toyota 17610-0S030 genuine secondary-air pump assembly
later pump branch after component-specific diagnosis Fitment/availability: VIN- and production-date-confirmed late-2013 through 2021 Land Cruiser 3UR-FE branch; catalog requires quantity two Fitment/availability: Live direct product page…
- Toyota 25701-38064 genuine electric air-control valve assembly
replace only after active testing proves the electric valve is stuck, leaking or electrically failed Fitment/availability: VIN-confirmed 2008-2021 Land Cruiser 3UR-FE catalog branch; exact production supersession and associated gaskets m…
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Owner tips & cautions
- TipRequest the updated air switching valve design per TSB-0111-10 when replacing - the revised valves have better moisture sealing.
- WarningDeleting the air injection system will cause a permanent CEL and emissions test failure. Only viable in non-emissions states.
The secondary air injection (AI) system on the 100-series Land Cruiser (1998-2007) with the 2UZ-FE 4.7L V8 is a notorious failure point, identical to the issue on the Sequoia and Tundra of the same era. The electric AI pump, air switching valves (ASV), and exhaust manifold check valves all fail. The aluminum check valves in the exhaust manifolds corrode and seize, the ASV sticks from carbon buildup, and the pump motor eventually burns out. This system is responsible for the most common check engine light on 100-series Land Cruisers.
Common Symptoms
- Check engine light with air injection codes
- Loud whirring from AI pump on cold start
- AI pump not running on cold start (silence where there should be noise)
- Multiple emissions-related fault codes
- Failed emissions inspection
How to Fix
The complete repair involves replacing the AI pump ($300-$500), both ASV valves ($200-$400 each), and both exhaust manifold check valves ($100-$200 each). Total dealer cost: $1,500-$3,000. Many Land Cruiser owners in non-emissions states delete the entire AI system and install an ECU tune to suppress the codes ($300-$500 for the tune). In emissions states, the full repair is required. A common partial fix is to replace just the check valves and ASV, leaving the pump in place — the pump usually fails last.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Toyota 17600-0F010 genuine secondary-air pump assembly
bulletin-specified pump replacement after the covered DTC diagnostic path confirms the condition Fitment/availability: VIN-confirmed 2005-2007 Land Cruiser 2UZ-FE; T-SB-0230-12 repair authority is limited to applicable 2006-2007 vehicles…
- Toyota 25710-50022 genuine secondary-air control/check valve
replace only when inspection under T-SB-0230-12 shows debris damage to this valve Fitment/availability: VIN-confirmed 2005-2007 Land Cruiser 2UZ-FE; current valve replaces 25710-50020 and 25710-50021 Fitment/availability: Live direct pro…
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
- TipJoin IH8MUD.com — the definitive Land Cruiser forum. The AI system delete with ECU tune is thoroughly documented there with step-by-step instructions and recommended tuners.
Sources for this issue (1)
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.
Tacomas with the 1GR-FE 4.0L V6 are known for failures of the secondary air injection system, including the air pump and switching valves. Moisture intrusion and valve sticking can trigger check-engine lights and force the truck into reduced-power or limp mode. Owners frequently report sudden loss of acceleration along with expensive dealer repair estimates because the intake manifold often must be removed to access components.
Common Symptoms
- check engine light
- TRAC/VSC lights on
- reduced power or limp mode
- poor acceleration
- cold-start abnormal pump noise
How to Fix
Diagnose with a scan tool and active tests to determine whether the pump, bank valves, or control circuits have failed. Repair usually involves replacing the failed air pump and/or switching valves, checking related vacuum/electrical connections, and clearing codes after verification. Some owners install bypass modules, but emissions-compliant repair with quality parts is the proper fix.
What you need to diagnose it
The repair instructions explicitly call for reading stored codes. Use a scanner that can read the named code families before choosing a repair.The recommended scanner supports these code families; confirm your exact year, model and module coverage before buying.
ANCEL AD310 Classic OBD-II Scanner
Read & clear engine (P) codes
$20–$40View
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Reading and clearing the code is DIY work. Module replacement or reprogramming is not — most modules are VIN-programmed, so a new one does nothing until a shop codes it to your car. Check for an open recall or service bulletin before buying anything.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Toyota 17610-0W020 genuine secondary-air pump assembly
replace the pump only when Toyota's active-test and DTC/inspection branch requires pump replacement Fitment/availability: Toyota's T-SB-0333-17 repair part for the VIN-specific 2012 Tacoma 4.0L 1GR-FE Mexico-production branch; confirm VI…
- Toyota 25710-31022 genuine secondary-air switching-valve assembly
replace a moisture-damaged or stuck switching-valve assembly as part of the Toyota-prescribed repair set Fitment/availability: Superseding switching-valve assembly specified by T-SB-0333-17 for the affected 2012 Tacoma 1GR-FE Mexico-prod…
- Toyota 17613-0P010 genuine air-pump protective cover
reduce repeat filter damage after the confirmed secondary-air-system repair Fitment/availability: Toyota T-SB-0333-17 and CSP ZHA cover for the affected 2012 Tacoma 1GR-FE repair; confirm VIN and use with the complete prescribed pump/val…
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
- TipIf the truck enters limp mode with P2440-series codes, diagnose the air injection system before replacing unrelated sensors.
- TipAddress water intrusion and inspect hoses/connectors during repair, since moisture is a common contributor to repeat failures.
Sources for this issue (2)
P2441 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 P2441 mean on a Toyota?
P2441 stands for "Secondary Air Injection System Switching Valve Stuck Closed (Bank 1)." P2441 indicates the secondary air injection system switching valve on bank 1 is stuck closed. The secondary air injection system pumps fresh air into the exhaust during cold starts to help the catalytic converter heat up and burn off pollutants faster; a switching valve controls that airflow. When the PCM commands the valve open but airflow doesn't occur as expected, it concludes the valve is stuck closed. This mainly affects cold-start emissions and will fail an emissions test, though drivability is usually normal. On Toyota it is documented across 4 models: Sequoia, Land Cruiser, 4Runner, Tacoma.
What are the most common causes of P2441?
The most common causes of P2441 are: Stuck or seized secondary air switching valve (bank 1), Carbon or rust buildup clogging the valve or air passages, Failed vacuum/control solenoid for the valve, Damaged vacuum lines or electrical connector to the valve, Faulty secondary air injection pump, Wiring fault in the valve control circuit, Moisture/corrosion in the air injection plumbing. The specific cause varies by vehicle.
How much does it cost to fix P2441 on a Toyota?
Published repair estimates on Toyota range from $300 to $3,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P2441 on a different make?
View P2441 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.