Loud Vacuum Cleaner Noise on Cold Start on Lexus LX470

Drivers may hear a loud noise, much like a vacuum cleaner, coming from their engine on cold starts. This affects the 1998-2005 Lexus LX470.

The noise is from the secondary air pump, which sends hot air to the catalytic converter when the engine is cold. This allows the catalytic converter to clean exhaust better, and lower emissions while the engine is warming up.

Pump failure may result in:

• Check engine light
• OBD trouble code P1445
• Smog test failure

Fixing the issue involves removal of the intake manifold, and replacement of the secondary air pump.