What does code P1661 mean?

Q: What does code P1661 mean?

EGR Circuit. P1661 on Toyota vehicles indicates that the engine control module has detected a fault within the exhaust gas recirculation (EGR) circuit, which controls the flow of inert exhaust gas back into the intake to reduce combustion temperatures and nitrogen oxide emissions. The computer monitors the EGR system's electrical circuits and flow performance, and when the signal from the EGR valve position sensor or the commanded current to the EGR stepper motor does not match expected values, it stores this code.

DTC codes / Toyota codes / P1661

P1661 · ToyotaEGR Circuit

P1661 on Toyota vehicles indicates that the engine control module has detected a fault within the exhaust gas recirculation (EGR) circuit, which controls the flow of inert exhaust gas back into the intake to reduce combustion temperatures and nitrogen oxide emissions. The computer monitors the EGR system's electrical circuits and flow performance, and when the signal from the EGR valve position sensor or the commanded current to the EGR stepper motor does not match expected values, it stores this code.

SystemPowertrain

Code typeToyota specific

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

Guidance is general and written for Toyota vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.