P1163 HONDA Air/Fuel Ratio Sensor 1 Slow Response

Possible causes
– Air/Fuel Ratio Sensor 1 harness is open or shorted
– Air/Fuel Ratio Sensor 1 circuit poor electrical connection
– Faulty Air/Fuel Ratio Sensor 1
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1163 HONDA Description
The Air/Fuel Ratio (A/F) sensor 1 is installed in the exhaust system and detects oxygen content in the exhaust gas. The A/F sensor transmits output voltage to the Engine Control Module (ECM)/Powertrain Control Module (PCM). A heater for the sensor element is embedded in the A/F sensor (sensor 1). It is activated and heats the sensor to stabilize and speed the detection of oxygen content by controlling current flowing through the heater. An increase in the current levels off as the applied voltage to the element electrode reaches a certain range because the amount of oxygen which is led through the diffusion layer is limited. The current amperage is proportional to oxygen content in the exhaust gas, so the air/fuel ratio is detected by the measurement of the current amperage. The ECM/PCM compares a set target air/fuel ratio with the detected air/fuel ratio and controls the fuel injection timing.

If the A/F sensor (sensor 1) voltage is low, the air/fuel ratio is lean, and the ECM/PCM uses A/F feedback control to issue a Rich command. If the A/F sensor (sensor 1) voltage is high, the air/fuel ratio is rich, and the ECM/PCM uses A/F feedback control to issue a Lean command.

If the element is not activated or the ECM/PCM terminal voltage is a set value or less for at least a set time period when the power is drawn to the A/F sensor (sensor 1) heater, a malfunction is detected and a DTC is stored.

HONDA Technical Service Bulletins for P1163 code
2000 HONDA INSIGHT ENGINE AND ENGINE COOLING:ENGINE
2000 HONDA INSIGHT TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS
2001 HONDA INSIGHT ENGINE AND ENGINE COOLING:ENGINE
2001 HONDA INSIGHT TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS
2002 HONDA INSIGHT ENGINE AND ENGINE COOLING:ENGINE
2002 HONDA INSIGHT TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS
2003 HONDA INSIGHT ENGINE AND ENGINE COOLING:ENGINE
2003 HONDA INSIGHT TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS
2004 HONDA INSIGHT ENGINE AND ENGINE COOLING:ENGINE
2004 HONDA INSIGHT TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS