P2441 on Lexus: How to Diagnose & Fix
Secondary Air Injection System Switching Valve Stuck Closed (Bank 1)
1 Lexus model · 1 documented issue · $800-$2,000 repair
P2441 on Lexus by model: symptoms, diagnosis and fix
The secondary air injection (SAI) system pump and switching valves fail due to moisture intrusion and corrosion. The SAI pump introduces fresh air into the exhaust during cold starts to reduce emissions, but the pump motor corrodes internally and the switching valves stick. This triggers a check engine light with SAI-related codes.
Common Symptoms
- Check engine light with P2440/P2441/P2442 codes
- Rough idle on cold start
- Failed emissions inspection
- Whirring noise from passenger side of engine on cold start
How to Fix
Replace the secondary air injection pump and switching valves. Clean or replace the air injection check valves. Clear codes and verify operation. Some owners in non-emissions-testing states choose to bypass the system entirely with a tune.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- 17600-0F010 genuine Lexus secondary-air injection pumpOEM17600-0F010
Replace a commanded-test-confirmed failed secondary-air pump Fitment/availability: Live page explicitly fits 2004-2009 GX470 2UZ-FE/UZJ120. It does not verify the issue's 2003 year.
- 25710-50022 genuine Lexus secondary-air switching/diverter valveOEM25710-50022
Replace the diagnosed failed main air-switching/diverter valve Fitment/availability: Live page explicitly fits 2004-2009 GX470 2UZ-FE and supersedes 25710-50020/21.
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Owner tips & cautions
- TipReplace both the pump AND the switching valves at the same time — if one has failed, the other is likely close behind. The valves are $150 each but save a second repair.
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 Lexus?
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 Lexus it is documented across 1 model: GX.
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 Lexus?
Published repair estimates on Lexus range from $800 to $2,000 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.