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What causes P1133 code?
Error Code P1133 happens when the PCM determines that the front HO2S was unable to switch enough times.
What is a code P1133?
Obd ii fault code p1133 is a manufacturer-specific code, and this code is defined in some applications as “ho2s (heated oxygen sensor) insufficient switching sensor 1” and is set when the pcm (powertrain control module) detects insufficient switching cycles between a rich running and a lean running cycle.
What causes slow oxygen sensor response?
The slow response of an O2 sensor may be due to a sensor that is just getting old and over time may get contaminated with time with carbon and other contaminants that deteriorate the sensor over time.
What should the downstream O2 sensor read?
The Downstream Oxygen Sensor (Oxygen Sensor 2) Therefore, the downstream oxygen sensor (sensor 2) should produce a steady voltage of approximately 0.45 volts.
What are downstream O2 sensors for?
The downstream oxygen sensor is located directly after the catalytic converter. This sensor measures the pollutants making it through the converter and out of the tailpipe. The data from this sensor is compared to that of the upstream sensor.
Is there a difference between a O2 sensor and a heated O2 sensor?
The only difference between the two is that the three-wire sensor shares a common ground between the heater and sending circuits. Therefore, a heated oxygen sensor is more efficient than an unheated sensor.
When is the P1133 Chevrolet code detected?
Most auto repair shops charge between $75 and $150 per hour. | When is the P1133 CHEVROLET code detected? If the Powertrain Control Module (PCM) determines that the front HO2S did not switch enough times, the PCM will set the P1133 code.
Why do I get P1133 on my Oxygen sensor?
The possible causes of this code are many and varied, and could include the following- Exhaust leaks that contaminate oxygen sensors’ reference air. Repair all exhaust leaks before attempting a diagnosis of P1133. Misfires on one or more cylinders.
How does the P1133 Chevrolet ho2s work?
P1133 Chevrolet Description. The Powertrain Control Module ( PCM) monitors the Heated Oxygen Sensor (HO2S) activity for 90 seconds after closed loop operation has begun. The PCM determines if the front HO2S is functioning properly by counting the number of HO2S-1 Lean/Rich (L/R) and Rich/Lean (R/L) switches.
When do I set code P1133 on my PCM?
Thus, when the PCM does not receive the amount of “switches” it expects to receive during the count, it will set code P1133, and illuminate a warning light. Note however that the time the counter runs, as well as the number of “switches” per second the PCM expects to receive varies between applications.