Check engine light

Tiny
CHSHDA
  • MEMBER
  • 2004 NISSAN SENTRA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 118,000 MILES
I have a 2004 nissan sentra and the check engine light came on with the code P1273. What does this code mean
Do you
have the same problem?
Yes
No
Saturday, January 15th, 2011 AT 9:47 AM

1 Reply

Tiny
KHLOW2008
  • EXPERT
DTC P1273 = A/F sensor 1. In layman's term, it is the O2 sensor.

COMPONENT DESCRIPTION
The A/F sensor 1 is a planar dual-cell limit current sensor. The sensor element of the A/F sensor 1 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 (air/fuel mixture) = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide (air/fuel mixture) range (0.7 < (air/fuel mixture) < air).

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.

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 (air/fuel mixture) = 1. Therefore, the A/F sensor 1 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).
Was this
answer
helpful?
Yes
No
Saturday, January 15th, 2011 AT 2:42 PM

Please login or register to post a reply.

Recommended Guides