P2251 Engine Trouble Code
When you check engine light came on code P2251 the reason should be Engine Light ON (or Service Engine Soon Warning Light). However your vehicle's manufacturer may have a different definition for the P2251 OBD-II Diagnostic Powertrain (P) Trouble Code. So you should chech it on our car models.
When the check engine light comes P2251 code on the first you should check is the gas cap. Pull over, retighten it, and take a look at the cap to see if it has any cracks in it. Continue driving and see if the check engine light turns off. Alternately, you can purchase a gas cap for about $3 at an auto parts store. All you need to do is take the old one off and screw on the new one. If you've already made it to the store, you might as well just replace it. While not car-threatening, it's good to take care of this right away to improve gas mileage.
P2251 Code Meaning :
|OBD-II Diagnostic Powertrain (P) Trouble Code For Engine||Fuel And Air Metering (Injector Circuit Malfunctions Only)||Ambient Air Temperature Sensor Circuit Low||Turbocharger Boost Sensor A Circuit Low||Glow Plug/Heater Circuit 'A' Malfunction|
The oxygen (02) sensors on your car measure the oxygen in the exhaust to determine how rich or lean the ratio of fuel and air are in the cylinders. Optimizing this mixture means better fuel economy and fewer exhaust emissions.
P2251 OBD-II Diagnostic Powertrain (P) Trouble Code DescriptionP2251 OBD-II Trouble Code The rear air/fuel ratio (A/F) sensor (bank 1, sensor 1) is installed in the exhaust manifold and detects oxygen content in the exhaust gas. The rear A/F sensor transmits a signal to the powertrain con P2251 code.
Reason For P2251 CodeThe reason of P2251 OBD-II Engine Trouble Code is Ambient Air Temperature Sensor Circuit Low.
Parts or components should not be replaced with reference to only a P2251 DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.