Symptoms
A check-engine light, often with the slip light flashing and 'Check VSC' on, that may come and go, especially in cold or damp weather. Codes such as P2438 (pressure sensor circuit high, bank 2). Owners on Tundra sites also report P2440–P2443.
The fix, step by step
- Read the code before you buy parts.
- IH8MUD members point to the factory description for P2438: pressure in the air-injection system is above its threshold, so suspects are the pressure sensor, its wiring or the ECM.
- If the light clears on its own, start with the sensor and wiring.
- Because the 3UR also powers the Tundra and Sequoia, their forums are a good source of fixes.
- Toyota extended warranty coverage on this system for 2007–2010 Tundras and 2008–2010 Sequoias; the Land Cruiser wasn't named.
Tools & part numbers
- OBD-II scanner with Toyota enhanced codes
- multimeter
- factory wiring diagram.
Where to buy the parts
Air / smog pumpRockAuto ↗Amazon ↗
Air pump check (switching) valveRockAuto ↗Amazon ↗
OEM air-injection system diagram (pumps, valves, sensor)ToyotaPartsDeal ↗
Hunting a used or discontinued part? Search eBay Motors for Toyota Land Cruiser 200 Series parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.