CAR OBD CODES
OBD/DTC Search, e.g.P1149
CAR OBD CODES P1149
P1149 OBD Code Definition:
P1149 Air/Fuel Ratio Sensor 1 Circuit Range/Performance
P1149 OBD Code Description:
– Air/Fuel Ratio Sensor 1 harness is open or shorted
– Air/Fuel Ratio Sensor 1 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1149 OBD Code 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.
Note: The information on the P1149 error code is purely informative, if you need more useful information, please consult your technician.
B1389 B1055 B2965 B1575 B2A35 P0B0F B00DF B2033 B0014 B272A B1153 B2385 B1A02 B1D69 B2565 OBDII Chassis Codes
C1837 C1824 C0063 C1152 C1821 C1915 C100C C1006 C1802 C0018 C1992 C1997 C1325 C1727 C0357 OBDII Network Codes
U2022 U2508 U1207 U041C U0011 U2605 U0257 U0457 U0010 U1103 U0503 U0158 U0195 U0455 U0009 OBDII Powertrain Codes
P0731 P0923 P0003 P0906 P2098 P0871 P2331 P0ABA P0BCB P2666 P2445 P1205 P2032 P1557 P0128