DTC P0133 Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 1); DTC P0153 Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 1): Description
The heated oxygen sensor is used to monitor oxygen concentration in the exhaust gas. For optimum catalytic converter operation, the air-fuel mixture must be maintained near the ideal stoichiometric air-fuel ratio. The heated oxygen sensor output voltage changes suddenly in the vicinity of the stoichiometric air-fuel ratio. The ECM adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The heated oxygen sensor generates a voltage between 0.1 and 0.9 V in response to oxygen concentration in the exhaust gas.
If the oxygen concentration in the exhaust gas increases, the air-fuel ratio is called LEAN. The heated oxygen sensor voltage drops below 0.45 V, which informs the ECM of the LEAN condition.
If oxygen is not in the exhaust gas, the air-fuel ratio is called RICH. The heated oxygen sensor voltage increases above 0.45 V, which informs the ECM of the RICH condition.
HINT:
The ECM provides a pulse width modulated control circuit to adjust current through the heater. The heated oxygen sensor heater circuit uses a relay on the +B side of the circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0133 P0153 |
Slow slope condition (2 trip detection logic): Heated oxygen sensor (sensor 1) does not switch between LEAN and RICH for 0.9 seconds LEAN: 0.4 V or less RICH: 0.55 V or more Frequency condition (2 trip detection logic): Time of heated oxygen sensor (sensor 1) frequency per one cycle is 0.9 seconds or more. |
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