Fault Code Related Video
Read This Article on our other site U1000 NISSAN – CAN Communication Line – Signal Malfunction
When is the P1273 code Detected?
The A/F signal computed by ECM from the A/F sensor 1 signal is shifted to the lean side for a specified period.
P1273 NISSAN Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible rough engine idle
- As with other error codes, this code activates the Check Engine light.
- This kind of lean condition error code doesn’t usually cause drivability issues, other than rough engine idle.
P1273 NISSAN POSSIBLE CAUSES
There are many possible causes that for this problem to arise, some of the most common causes are:
- Fuel pressure
- Defective Air Flow Meter
- Defective Fuel Injector
- Faulty Air fuel ratio (A/F) Sensor 1 Bank 1
- 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
- Faulty Fuel injector Faulty Air Flow Meter
P1273 NISSAN DEFINITION
The A/F or Air Fuel Ratio Sensor is a planar dual-cell limit current sensor. It comes with a sensor element that combines with the Nernst concentration cell (sensor cell) with an Oxygen-pump cell, which job is to transport ions. It also has a heater element.
The sensor in this component is capable of precise measurement λ = 1, and also in lean and rich range. Along with its control electronics, the sensor outputs a clear and continuous signal through a wide range of λ range (0.7 < λ < air).
Exhaust Gas
The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.
Electronic Circuit
An electronic circuit controls the pump current through the oxygen-pump cell so that the composition of the exhaust gas in the diffusion gap remains constant at λ = 1. Therefore, the A/F sensor is able to indicate air/fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 – 800 C (1,292 – 1,472 F).
