DTC Detection Logic

To judge the malfunction, the A/F signal computed by ECM from the A/F sensor 1 signal is monitored not it will shift to LEAN side or RICH side.

DTC No.	Trouble diagnosis name (Trouble diagnosis content)	DTC detecting condition	Possible Cause
P2A00	A/F SENSOR1 (B1) [Air fuel ratio (A/F) sensor 1 (bank 1) circuit range/performance]	The output voltage computed by ECM from the A/F sensor 1 signal is shifts to the lean side for a specified period. The A/F signal computed by ECM from the A/F sensor 1 signal is shifts to the rich side for a specified period.	A/F sensor 1 A/F sensor 1 heater Fuel pressure Fuel injector Intake air leaks
P2A03	A/F SENSOR1 (B2) [Air fuel ratio (A/F) sensor 1 (bank 2) circuit range/performance]