SES light - Check engine light

even if a battery is only a year old it stil must be checked with multiple codes like I said in first reply it can still be bad. so do what my first reply said. and give us the codes as one code may effect other ones.

I checked the battery and even disconnected it and still it does the same. The codes are as follows: P0745, U1001, P0507, P0462, P0463, P0128, P0447, P0745, U1001, P0462, P0463, P0447.
Mil On 1INC, Evap 6 ready.
Misfire: Fuel, Comp, catlyst, 02 Snsr, 02 HTR

your battery needs to be put on a machine not you saying it's ok. you think it's ok because the car starts but not might be. u1001 code si the ecm isnt' getting communication so for that one a pro needs to look at it . and the misfire thing you are talking about there isn't even a codes showing for it as the codes listed are not misfire codes.the 745 code can be result of poor running engine so engine codes must be fixed first.the 462 code is fule level sensor as well as 463. this can be a can bus problem and a pro definitely needs to see this car.

I have a 2004 nissan sentra and the check engine light came on with the code P1273. What does this code mean

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).

© 2008 Mitchell Repair Information Co., LLC.

I have a 2004 Nissan Sentra, I have been having issues with it starting first thing in the morning, if it does start it spits and sputters for a few minutes. Also when starting I have to hold the key I have had cam shift sensor, O2 uptake sensor, head gasket and fuel injectors replaced. I am getting a 1278 trouble code. Help!!!!

Instead of the sensor, check the wiring. Most of the time, bad wiring will trip this code.

Thanks for the reply. Would having no heat in the vehicle identify anyonr of the possible causes?

No cabin heat has no effect on P1278. For that, start by checking the coolant level in the reservoir. If the level is at max, check for possible faulty (stuck open) thermostat, clogged heater core, or inoperative intake door (in blower motor housing)