What does code P1661 mean on Toyota vehicles?
The ECU detects a malfunction in the exhaust gas recirculation (EGR) circuit.
OBD-II Code Toyota
P1661 — Toyota — EGR Circuit Malfunction
The ECU detects a malfunction in the exhaust gas recirculation (EGR) circuit.
Common symptoms
- Rough idle
- hesitation
- increased emissions
Possible causes
- Faulty EGR valve
- wiring issues
- poor electrical connections
Initial recommendation
Inspect EGR circuit wiring and test EGR valve operation.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine Toyota code P1661 with your vehicle's actual symptoms for more complete diagnostic guidance.
Go to the app View more brands