P2188 MAZDA System Too Rich At Idle Bank 1

Possible causes
– Leaking fuel injector or pressure regulator
– High fuel pressure condition
– Faulty Oxygen (O2) Sensor
– Faulty Mass Air Flow (MAF) sensor
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
MAZDA Technical Service Bulletins for P2188 code
2004 MAZDA MAZDA3 ELECTRICAL SYSTEM
2005 MAZDA MAZDA3 ELECTRICAL SYSTEM