Possible causes

– Air fuel ratio (A/F) sensor 1 harness is open or shorted
– Air fuel ratio (A/F) sensor 1 circuit poor electrical connector
– Faulty Air fuel ratio (A/F) sensor 1
– Faulty Air fuel ratio (A/F) sensor 1 heater
– Improper fuel pressure
– Faulty Fuel injector
– Intake air leaks
– Exhaust gas leaks
– Faulty PCV valve
– Faulty Mass Air Flow (MAF) sensor

When is the code detected?

The response (from RICH to LEAN) of the A/F (Bank 1) signal computed by ECM from A/F sensor 1 signal takes more than the specified time.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1288 Description

The 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