What causes P1661 on a Toyota?

Failed number 2 exhaust control valve Open or shorted valve circuit Carbon-locked valve Corroded connector ECM fault

How do I fix P1661 on a Toyota?

Test valve resistance Check for carbon binding Verify circuit wiring Command the valve and watch response Replace the valve per findings

P1661 Turbocharger 2 Exhaust Gas Control Valve Circuit (Diesel)

Q: What does P1661 mean on a Toyota?

P1661. Turbocharger 2 Exhaust Gas Control Valve Circuit (Diesel). Applies to Land Cruiser diesel with sequential turbos.

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: Land Cruiser diesel with sequential turbos

What does P1661 mean on a Toyota?

P1661. Turbocharger 2 Exhaust Gas Control Valve Circuit (Diesel). This Toyota-enhanced code applies to Land Cruiser diesel with sequential turbos.

Common causes of P1661

Failed number 2 exhaust control valve
Open or shorted valve circuit
Carbon-locked valve
Corroded connector
ECM fault

How to fix P1661

Test valve resistance
Check for carbon binding
Verify circuit wiring
Command the valve and watch response
Replace the valve per findings

Sources and review

Last updated 2026-09-06.