Oxygen sensor is the key feedback sensor in the EFI engine control system which installed on the engine exhaust pipe to detect the oxygen concentration in the exhaust and the density of air-fuel ratio. The theoretical air-fuel ratio is carried out in the engine (14.7: 1) Combustion monitoring, and sending feedback signals to the computer,reducing automobile environmental pollution, and improving the quality of automobile engine fuel combustion.
Sensitivity detection: Start the engine and let the engine run at 2500 r/min for 3 minutes to allow the oxygen sensor to reach the operating temperature. The engine continues to run at 2500r/min, and the signal voltage of the oxygen sensor is measured at the same time. If the number of times the signal voltage fluctuates between 0.1 V~1.0V is greater than 8 times within 10 seconds, it means that the sensitivity of the oxygen sensor is normal. Otherwise, the oxygen sensor should be replaced.
