P0456 was likely the gas cap, evaporative emission alert.
p1273
Either the exhaust is leaking or management needs reset.
'Clear the Self Learning Data' procedure. Anytime fuel component is replace, this procedure needs to be done. (exhaust emissions as well)
1. Unplug MAF sensor
2. Start car for about 3 seconds. Turn off car. confirm P0102 code
3. re-connect MAF sensor. Clear code. START car.
4. Run car for 10 mins.
SOURCE: 2004 nissan sentra problem
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
ask for more
WITH MY BEST WISHES
SOURCE: Horrid gas mileage with a 91' Nissan D21, 4x4, 5-speed.
hello there
Your car needs a tune up, including the air filter, fuel filter and spark plugs. It's also worth while checking for a faulty/stuck brake caliper, after you've been on a longish drive go around and feel the wheel rims if one is alot more warmer than the rest then you also have a faulty brake caliper.
Hope this helps. Please don't forget to rate me.
Thanks
SOURCE: Nissan Maxima 1996 issues-sensors
Dear Gandhi
1) You better check the 'Idle control relay' - and pray this is not your computer - who may be shorted ( The Computer that govern all elec. functions in the car - is also getting signals from your Mothor Mounts' to ensure a more balanced ride'
If one or more of the Motor Mounts ( There are 3 ) are defective - they send a signal to the computer - and the yellow light ( Check engine soon) - will appear'
2) A Computer can only be fixed by a Nissan dealer ( est. $750 )
3) The Idle control valve - can be adjusted too ( Again - by a Nissan Dealer only .
4) It is NOT an easy problem nor cheap . In short - your best bet is with the dealer - and ask them for a diagnostic ONLY ( est. $100 )
Don't tell the dealer what YOU think or did .......just tell them the 'Yellow light comes on' .......they'll take it from there.
Sorry I don't have better news today .
Best of luck
David
SOURCE: What is a code P1273/
Follow this link for a possible answer: http://www.nissanhelp.com/diy/obd_codes/p1273.htm.
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)
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