Anyone know what these codes mean in english? I heard that they are insufficient switching of the O2 sensors. Whats up with these? I have had these codes for a while
Phillip

 

DTC P1133 HO2S Insufficient Switching Bank 1 Sensor 1




Circuit Description
The PCM monitors the Heated Oxygen Sensor (HO2S) activity for 100 seconds. During this monitor period, the PCM counts the number of times that the HO2S switches form rich to lean and lean to rich. When the PCM determines that the HO2S did not switch enough times, a DTC P1133 will set.

A lean to rich switch is determined when the HO2S voltage changes from less than 300 mV to greater than 600 mV. A rich to lean switch is determined when the HO2S voltage changes from more than 600 mV to less than 300 mV.

Conditions for Running the DTC
DTCs P0101, P0102, P0103, P0112, P0113, P0117, P0118, P0125, P0200, P0335, P0336, P0351-P0358, P1120, P1220, P1221, P1258 are not set.
This DTC only runs once an ignition cycle.
The system is operating in Closed Loop.
The engine is operating longer than 120 seconds.
The engine speed is greater than 1000 RPM but less than 2300 RPM.
The ignition voltage is greater than 9 volts.
The engine coolant temperature is greater than 50°C (122°F).
The EVAP duty cycle is greater than 0%.
The MAF ranges between 20 g/s and 50 g/s.
Conditions for Setting the DTC
The PCM determines that within 100 seconds the HO2S lean to rich switches are less than 10 and rich to lean switches are less then 10.

Action Taken When the DTC Sets
The PCM illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure Records.
Conditions for Clearing the MIL/DTC
The PCM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Use a scan tool in order to clear the MIL and the DTC.
Diagnostic Aids

Important
Remove any debris from the PCM\TAC module connector surfaces before servicing the PCM\TAC module. Inspect the PCM\TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM\TAC modules.
For any test that requires probing the PCM or a component harness connector, use the Connector Test Adapter Kit J 35616-A . Using this kit prevents damage to the harness/component terminals. Refer to Using Connector Test Adapters in Wiring Systems.

Inspect the HO2S signal circuit for being shorted to a PCM ground. The HO2S signal circuit shorted to a PCM ground will not cause an HO2S low DTC to set, but will set a switching DTC.
A malfunction in the HO2S heater circuits will cause a DTC P1133 to set. Inspect the HO2S heater circuits for intermittent opens/connections.
An oxygen supply inside the HO2S is necessary for proper operation. This supply of oxygen is provided through the HO2S wires. All HO2S wires and connections should be inspected for breaks or contamination. Refer to Heated Oxygen Sensor (HO2S) Wiring Repairs in Wiring Systems.
Using the Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If the DTC cannot be duplicated, the information included in the Freeze Frame and/or Failure Records data can be useful in determining how many miles since the DTC set. The Fail Counter and Pass Counter can also be used to determine how many ignition cycles the diagnostic reported a pass and/or a fail. Operate vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This will isolate when the DTC failed.
For an intermittent, refer to Symptoms .


1153 is the same but is bank 2.

 

:iagree: Make sure that you dont have an o2 wire touching the collector or the headers somewhere. I just went throuh the same issue and bought 2 new rear o2's and put them up front. It solved the problem and now no PCM codes. Good luck!

Matt

 

These are same codes you get with the front O2's hooked up in our headers. This is why we switched to using the higher wattage rears.

 

If I use the ORPs on my FLP header system and use 02 sims in the rear and remove the 02 senors that go on the front and replace them with 02 sensors from the rear, these codes may not come up. Or just replace the front 02 sensors with new ones?

 

As I understand it, these codes mean that the 02 sensors are not getting enough heat from the engine to give quick enough readings to the PCM. This is caused by the stock 02s being farther away from the engine because of their relocation when you run long tube headers.

I know everyone recommends taking the rear 02s and moving them up front, but is it known that these rear 02s have the same accuracy range and calibration as the front 02s?

 

Phil,

See the post above from Godspeed.

LGM changed my 'low' (orig's) to the new 'high' wattage for a similar reason.

It worked!

:cheers: