P2A03 Buick Oxygen (O2) Sensor Circuit Range / Performance (Bank 2 – Sensor 1)
Possible causes
– Air Fuel Ratio (A/F) Sensor Bank 2 Sensor 1
– Air Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 harness is open or shorted
– Air Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 circuit poor electrical connection
– Fuel pressure
– Fuel injector
– Intake air leaks
– Air Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 harness is open or shorted
– Air Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 circuit poor electrical connection
– Fuel pressure
– Fuel injector
– Intake air leaks
Tech description
If the P2A03 Buick code is set after a sensor is replaced, check for exhaust leaks and perform the mixture ratio self-learning procedure.
What about the obd code?
The output voltage computed by ECM from the A/F sensor 1 signal is shifted to the lean side for a specified period.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P2a03 Nissan Description
The Air Fuel Ratio (A/F) sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement