On Board Diagnosis Logic

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

To judge malfunctions, the A/F signal computed by ECM from the A/F sensor 1 signal is monitored not to be shifted to LEAN side or RICH side.

DTC No.	Trouble diagnosis name	DTC detecting condition	Possible cause
P2A00 2A00 (Bank 1)	Air fuel ratio (A/F) sensor 1 circuit range/performance	The output voltage computed by ECM from the A/F sensor 1 signal shifts to the lean side for a specified period. The A/F signal computed by ECM from the A/F sensor 1 signal shifts to the rich side for a specified period.	A/F sensor 1 A/F sensor 1 heater Heated oxygen sensor 2 Fuel pressure Fuel injector Intake air leakage Exhaust gas leaks
P2A03 2A03 (Bank 2)	Air fuel ratio (A/F) sensor 1 circuit range/performance