100 Series Land Cruiser / Lexus LX 470: Check engine light with secondary air injection codes (P2440, P2442, P2445, P0418), whirring at cold start

Checks, in order

1. Confirm the codes
   Read stored codes and freeze-frame data. The air system only runs for a short time after a cold start, so the code can come and go.
   easy $ · under about $50
2. Listen at cold start
   Start the engine cold and listen for the air pump. A loud whir is a worn pump, and silence when the system should be running points to the pump, its relay or the control circuit.
   easy $ · under about $50
3. Inspect for debris
   Check the pump and air filter for dirt or debris. Per the bulletin approach, if debris is present, replace the pump and inspect the other components.
   medium $$ · about $50 to $500
4. Switching valves
   Valve codes (P2440, P2442) point to the air switching valves. The bulletin approach is to replace them only if they are damaged, not by default.
   medium $$ · about $50 to $500
5. Control driver
   If P0418 or P2445 is present, Toyota's repair path includes the control driver. This needs a scan tool and the factory procedure, so a shop may be best.
   hard $$$ · shop-level job, $500+

Applies to: US-market UZJ100 Land Cruiser and Lexus LX 470, 1998 to 2007, with the 2UZ-FE 4.7L V8 (timing belt). AHC items apply to the LX 470 only; most US Land Cruisers have conventional shocks. Transmission is the A343F or A750F depending on year, so check the fluid spec for your truck.

Tools and parts for these checks

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Go deeper

• Toyota 2UZ-FE 4.7 V8: Specs, Reliability & High Mileage Guide

The same problem on other Toyotas

• Lexus GX 460 (2010–2023): Check engine light with 4LO and TRAC OFF flashing, codes P0418, P2440, P2442, P2445 (2010–2013)

More 100 Series Land Cruiser / Lexus LX 470 problems

• Timing belt due, squeal or rattle from the front of the engine, or coolant and oil weeping at the front (Engine)
• Engine temperature gauge climbing, overheating or losing coolant (Cooling)
• Turn the key: click or nothing, engine won't crank (Starting & Charging)
• Engine cranks normally but won't start (Fuel & Ignition)
• Rough idle, stumbling or a misfire code (P0300 to P0308) (Fuel & Ignition)
• Check engine light with P0171, P0174 or air-fuel sensor codes (P2195, P2197) (Fuel & Ignition)

All 15 100 Series Land Cruiser / Lexus LX 470 symptoms in the interactive troubleshooter →

General guidance from owner experience. Confirm torque specs, fluid capacities and procedures in the factory service manual. Brakes, steering and anything structural: if in doubt, have a qualified shop inspect it before driving.