P1442 on 2005-2009 Toyota 4Runner — Evaporative Emission Control System Leak Detected (Small Leak)
1 vehicles · 1 makes · $900-$3,000 repair
How to diagnose and fix P1442: 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 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…
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P1442 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 P1442 mean?
P1442 stands for "Evaporative Emission Control System Leak Detected (Small Leak)." This is a manufacturer-specific EVAP (evaporative emissions) code; on Ford it generally means the computer detected a small leak in the system that captures fuel-tank vapors to keep them from reaching the atmosphere. On some other makers it refers to the EVAP leak-detection pump control circuit, so the exact meaning varies by manufacturer. It is an emissions code, not a drivability safety issue, though it will keep the check engine light on. The most frequent cause is something as simple as a loose or worn gas cap.
What are the most common causes of P1442?
The most common causes of P1442 are: Loose, cracked, or worn fuel filler cap, Cracked or disconnected EVAP hose or vacuum line, Faulty purge or vent valve/solenoid, Leaking or cracked charcoal (EVAP) canister, Damaged fuel-tank or filler-neck seal, Faulty leak detection pump (on makers that use one). The specific cause varies by vehicle.
How much does it cost to fix P1442?
Repair costs for P1442 range from $900 to $3,000, depending on the vehicle and root cause.
Which vehicles are affected by P1442?
Au7o has documented P1442 across 1 vehicle models from 1 manufacturers: Toyota.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.