DTC Detection Logic

To judge malfunctions, the diagnosis checks that the A/F signal computed by ECM from the A/F Sensor 1 signal is not inordinately low.

DTC No.	Trouble Diagnosis Name	DTC Detecting Condition	Possible Cause
P0131	Air Fuel Ratio (A/F) Sensor 1 (Bank 1) Circuit low voltage	The A/F signal computed by ECM from the A/F Sensor 1 signal is constantly approx. 0 V.	Harness or connectors (The A/F Sensor 1 Circuit is open or shorted.) A/F Sensor 1
P0151	Air Fuel Ratio (A/F) Sensor 1 (Bank 2) Circuit low voltage