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You erase the engine light by fixing the problem . With every DTC - diagnostic trouble code there are diagnostic flow chart's , steps to find the problem .
DTC P0442 : Evaporative Emission (EVAP) System Small Leak Detected
P0442: Evaporative Emission (EVAP) System Small Leak Detected
With a P0442, the most common repair is to:
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, or
Inspect the EVAP system for cuts/holes in tubes/hoses China OBD2 car diagnostic tools wholesale on CareUCar
evaporative emission (EVAP) system --small leak detected===causes --hose connection/s--intake leak--EVAP canister--EVAP canister purge valve
and the second possible
The code means the computer has tried to vent the gas tank and has found a small leak in the vent system. You may need to research the code to get the testing procedure for your model and year.
The simplest method is to spray the components with something like carburetor cleaner that would cause the engine to lug down when the carb cleaner hits the cylinder.
P0446 Evaporative Emission System Vent Control Circuit.
The following are descriptions of all Evaporative possible codes:
P0441 Evaporative Emission System Incorrect Purge Flow P0442 Evaporative Emission System Leak Detected (small leak) P0443 Evaporative Emission System Purge Control Valve Circuit P0444 Evaporative Emission System Purge Control Valve Circuit Open P0445 Evaporative Emission System Purge Control Valve Circuit Shorted P0446 Evaporative Emission System Vent Control Circuit P0447 Evaporative Emission System Vent Control Circuit Open P0448 Evaporative Emission System Vent Control Circuit Shorted P0449 Evaporative Emission System Vent Valve/Solenoid Circuit P0450 Evaporative Emission System Pressure Sensor/Switch P0451 Evaporative Emission System Pressure Sensor/Switch Range/Performance P0452 Evaporative Emission System Pressure Sensor/Switch Low P0453 Evaporative Emission System Pressure Sensor/Switch High P0454 Evaporative Emission System Pressure Sensor/Switch Intermittent P0455 Evaporative Emission System Leak Detected (large leak) P0456 Evaporative Emission System Leak Detected (very small leak) P0457 Evaporative Emission System Leak Detected (fuel cap loose/off) P0458 Evaporative Emission System Purge Control Valve Circuit Low P0459 Evaporative Emission System Purge Control Valve Circuit High
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At least the cap isn't loose for the gas tank.
I would clear the code with an OBD-II Scanner 'erase code' button, and see how long it takes for it to come back.
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