Possible causes
– Faulty Air fuel ratio (A/F) sensor 1 Bank 1
– Faulty Air fuel ratio (A/F) sensor 1 heater Bank 1
– Fuel pressure
– Faulty Fuel injector
– Intake air leaks
– Faulty Air Flow Meter
– Faulty Air fuel ratio (A/F) sensor 1 heater Bank 1
– Fuel pressure
– Faulty Fuel injector
– Intake air leaks
– Faulty Air Flow Meter
Tech description
If one or more sensors are replaced the Engine Control Module (ECM) Mixture Ratio Self-Learning clearing procedure must be perform.
Sentra ECM Self-Learning procedure
Altima ECM Self-Learning procedure
Maxima ECM Self-Learning procedure
Nissan Service Bulletin OBDII Code P1273
There are factory service bulletin for the following Nissan models:
2004 Maxima (A34) with 5 speed A/T only
2004 Quest (V42) with 5 speed A/T only
Nissan Factory Service Bulletin OBDII Code P1273
2004 Maxima (A34) with 4-speed A/T and 6-speed M/T
2004 Quest (V42) with 4-speed A/T
Nissan Factory Service Bulletin OBDII Code P1273
2005 Nissan Maxima
2005 Nissan Maxima Factory Service Bulletin OBDII Code P1273
Altima Sedan
Altima Coupe
Armada
Frontier
Cube
Maxima
Murano
Pathfinder
Quest
Rogue
Sentra
Titan
Versa
Xterra
Nissan Factory Service Bulletin OBDII Code P1273
When is the obd code mean?
The A/F signal 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)
– Possible rough engine idle
– Possible rough engine idle
P1273 NISSAN OBD Code Description