P1273 Manufacture contr fuel air metering 2004 nissan sentera

P1800 is the VIAS system. Most likely the intake runner control vacuum actuator is defective. Where did you get the ABS info?
P1273 NISSAN - Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring.
Possible causes - Faulty Air fuel ratio (A/F) Sensor 1 Bank 1
-Intake manifold or vacuum hose leaking (check this first)
- Air fuel ratio (A/F) Sensor 1 Bank 1 harness is open or shorted
- Air fuel ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection
- Fuel pressure
- Faulty Fuel injector
- Faulty Air Flow Meter
If all seems ok then replace the cylinder bank number one O2 sensor and the bank two sensor, replacing only one sensor can lead to another check engine light. These are the sensors before the catalytic converter.

Please go here on pc, to give you a more detailed description of p1273. www.autocodes.com/p1273_nissan.html GOD-BLESS,

Robert, Code P1273 Air Fuel Ratio, Sensor 1 Lean, Shift Monitoring Bank 1
See links below for trouble shooting and fix.
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P1273 Nissan Air Fuel Ratio Sensor 1 Lean Shift Monitoring Bank 1

The dreaded P1273 Code 2005 2 5S

p1273 Nissanhelp com Forums

https://ca.answers.yahoo.com/question/index?qid=20140225092422AAZkNxF

code p 1273 refers to heated oxygen sensor (HO2S) 1 --lean mixture === causes --the HO2S sensor --fuel pressure , injectors , intake air leak ( faulty vacuum hoses to brake booster or dash vent controls )
I would start at the HO2S sensor as that would be the most probable unit that fails
It is the one before the cat converter or in the exhaust manifold

P1273 Code Nissan Xterra Air fuel sensor Lean shift. Live ...

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2005 Nissan Xterra MIL ON P1273 air fuel sensor LEAN SHIFT.... what is the meaning of the Data and how to ...

Trouble Code: P1273

Air Fuel Sensor (Bank 1 Sensor 1) Circuit Lean Shift

Possible Causes:


Air Fuel Sensor (AFS) is damaged or has failedAir Fuel Sensor (AFS) heater is damaged or has failedIntake air leaks somewhere in the engine or intake areaFuel system problem (low fuel pressure, restricted injectors)

Your oxygen sensor may also be faulty

that is a code for the A/F sensor. that is a air/fuel ratio sensor aka front 02 sensor. used to be called front 02 sensor, but nowadays they call them A/F sensor.

HI
the (P1273) refer to A\F SENSOR
that locate in the exhaust pipe
it was a sensor calculate the air to fuel ratio in the exhaust pipe and send that as electrical signal to the (ECU) that use it to correct the fuel injection timing in result to have economy of fuel and low bad gases in exhaust
the cause of this fault is :-
air fuel ratio sensor 1
air fuel ratio sensor 1 heater
fuel presser
fuel injectors
intake air leaks

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