P1662 Exhaust Bypass Valve Circuit (Diesel)

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: Hilux, Land Cruiser Prado diesel

What does P1662 mean on a Toyota?

P1662 — Exhaust Bypass Valve Circuit (Diesel). This Toyota-enhanced code applies to Hilux, Land Cruiser Prado diesel.

Common causes of P1662

Failed exhaust bypass valve
Open or shorted valve circuit
Soot-locked valve
Corroded connector
ECM fault

How to fix P1662

Test valve resistance
Decarbonize the valve
Check circuit wiring
Command and verify response
Replace the valve per tests