P1132 SATURN – Low Variance of H02S Circuit, Bank 2 Sensor 1

P1132 SATURN Possible Causes

  • Faulty front oxygen sensor
  • Front oxygen sensor harness is open or short-circuited
  • Poor electrical connection in the front oxygen sensor circuit

How to Fix P1132 SATURN Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check engine light on (or service engine soon warning light)

P1132 SATURN Meaning

A heated exhaust gas oxygen sensor (HO2S) indicating rich at the end of a test attempts to correct a too lean condition. The test fails when the fuel control system no longer detects switching for a calibrated duration.

P1132 SUBARU – Low Input of Front Oxygen Sensor Heater Circuit

P1132 SUBARU Possible Causes

  • Faulty front oxygen sensor
  • Front oxygen sensor harness is open or short-circuited
  • Poor electrical connection in the front oxygen sensor circuit

How to Fix P1132 SUBARU Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check engine light on (or service engine soon warning light)

P1132 SUBARU Meaning

A heated exhaust oxygen sensor (HO2S) indicating rich at the end of a test attempts to correct a too lean condition. The test fails when the fuel control system no longer detects switching for a calibrated duration.

P1132 SUZUKI – High voltage in the O2 sensor circuit

P1132 SUZUKI Possible Causes

  • Faulty O2 sensor
  • O2 sensor harness is open or shorted
  • Poor electrical connection in the O2 sensor circuit
  • Faulty Engine Control Module (ECM)

How to Fix P1132 SUZUKI Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check Engine Light on (or Service Engine Soon warning light)

P1132 SUZUKI Meaning

A Heated Exhaust Gas Oxygen Sensor (HO2S) indicating rich at the end of a test attempts to correct a too-lean condition. The test fails when the fuel control system no longer detects switching for a calibrated duration.

P1132 VOLKSWAGEN – Heater O2S Circuit, Bank 1/2 Sensor 1, Short to B+

P1132 VOLKSWAGEN Possible Causes

  • Faulty O2 sensor
  • O2 sensor harness is open or shorted
  • Poor electrical connection in the O2 sensor circuit

How to Fix Code P1132 VOLKSWAGEN?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check engine light on (or service engine soon warning light)

P1132 VOLKSWAGEN Meaning

A heated exhaust oxygen sensor (HO2S) indicating rich at the end of a test attempts to correct a too lean condition. The test fails when the fuel control system no longer detects switching for a calibrated duration.

P1132 VOLVO – HO2S Switch Missing

P1132 VOLVO Possible Causes

  • Faulty rear O2 sensor
  • Rear O2 sensor harness is open or shorted
  • Poor electrical connection in the rear O2 sensor circuit
  • Intake leak

How to Fix P1132 VOLVO Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

What does it mean?

The code means the sensor is not reading correctly. Before replacing the sensor, check for intake vacuum leaks. Intake vacuum leaks can cause incorrect O2 sensor readings.

Symptoms

possible

  • Check engine light on (or service engine soon warning light)

P1132 VOLVO Meaning

A heated exhaust oxygen sensor (HO2S) indicating rich at the end of a test attempts to correct a too lean condition. The test fails when the fuel control system no longer detects switching for a calibrated duration.

P1133 – Insufficient HO2S Switch Sensor 1

P1133 Possible Causes

  • Faulty Heated Oxygen Sensor (HO2S), Bank 1 Sensor 1
  • Vacuum leak
  • Faulty Heated Oxygen Sensor (HO2S), Bank 1 Sensor 1 harness is open or shorted
  • Faulty Heated Oxygen Sensor (HO2S), Bank 1 Sensor 1 circuit, poor electrical connection

How to Fix Code P1133?

Start by checking the “Possible Causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check Engine Light On (or Service Engine Soon Warning Light)

P1133 Meaning

The Powertrain Control Module (PCM) monitors the Heated Oxygen Sensor (HO2S) activity for 90 seconds after the start of closed loop operation. The PCM determines whether the front HO2S is functioning properly by counting the number of HO2S-1 Lean/Rich (L/R) and Rich/Lean (R/L) switches.

P1133 TOYOTA CAMRY – Malfunction in Air/Fuel Ratio Sensor Circuit Response, Bank 1 Sensor 1

P1133 1997 TOYOTA CAMRY Possible Causes

  • Faulty Air/Fuel Ratio Sensor, Bank 1 Sensor 1
  • Air/Fuel Ratio Sensor, Bank 1 Sensor 1 Harness is Open or Shorted
  • Air/Fuel Ratio Sensor, Bank 1 Sensor 1 Circuit, Poor Electrical Connection

How to Fix Code P1133 1997 TOYOTA CAMRY?

Start by checking the “Possible Causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check Engine Light On (or Service Engine Soon Warning Light)

P1133 1997 TOYOTA CAMRY Meaning

The Air/Fuel Ratio (A/F) sensor varies its output voltage proportionally to the air/fuel ratio. Based on the output voltage, the Engine Control Module (ECM) determines whether the air/fuel ratio is RICH or LEAN and adjusts the stoichiometric air/fuel ratio. The ECM also checks the fuel injection volume compensation value to verify whether the A/F sensor is deteriorating or not. The deterioration of the A/F sensor response is determined by the ratio between the A/F sensor output voltage change and the fuel compensation change.

P112F CHEVROLET – Radiator Coolant Temperature Sensor

Code P112F Chevrolet: Possible Causes

  • Faulty Radiator Coolant Temperature (RCT) Sensor: Internal resistance out of specification or electronic failure.

  • Electrical Harness Problem: Open circuit, short circuit, or damaged wires between the RCT sensor and the ECM.

  • Faulty Connections: Oxidation, corrosion, or improperly engaged pins in the sensor or ECM connector.

Common Symptoms

  • 🔥 Check Engine Light illuminated (or “Service Engine Soon” message).

  • Engine overheating or abnormal temperature displayed on the dashboard.

  • Unstable idle or loss of power when cold.

  • Increased fuel consumption (due to a non-optimized air-fuel mixture).

  • Risk of limp mode activation to protect the engine.

Meaning of Code P112F
The RCT (Radiator Coolant Temperature) sensor measures the coolant temperature at the radiator level. Unlike the ECT (Engine Coolant Temperature) sensor, which monitors the engine temperature, the RCT evaluates the cooling efficiency after passing through the radiator.

  • Operation:

    • The RCT sensor is a thermistor (a variable resistor with temperature).

    • The ECM sends a 5 V voltage to the sensor circuit and uses the return voltage to calculate the temperature.

    • In case of prolonged engine shutdown, the ECM compares the RCT data with the ECT data to detect anomalies (e.g., abnormal temperature difference).

Code P112F is triggered when:

  • The temperature measured by the RCT is inconsistent with that of the ECT after a specific shutdown period.

  • The RCT signal falls outside the tolerance ranges specified by the manufacturer.

Diagnostic and Repair Procedure

  1. Visual Inspection

    • Inspect the RCT sensor harness: Check for cut, pinched, or heat-exposed wires.

    • Check the connectors: Clean the pins with contact cleaner and ensure they are intact and securely fastened.

  2. RCT Sensor Test

    • Resistance Measurement:

      • Disconnect the sensor and use a multimeter in ohmmeter mode.

      • Compare the resistance with reference values (e.g., ~2,500 Ω at 20°C, ~300 Ω at 80°C).

    • Voltage Measurement:

      • Reconnect the sensor and measure the voltage between the signal wire and engine ground (should vary between 0.5 V and 4.5 V depending on temperature).

  3. Checking Power and Ground

    • Ensure the sensor receives 5 V on the reference wire and that the ground is stable (resistance < 0.5 Ω between the ground pin and the battery).

  4. Comparison with the ECT Sensor

    • Use a diagnostic tool to read live data from the RCT and ECT sensors.

    • After an engine shutdown period (e.g., 1 hour), verify that the temperature difference between the two sensors is consistent (generally < 10°C).

  5. Replacement or Repair

    • If the RCT sensor is faulty, replace it with an ACDelco part (recommended for Chevrolet).

    • Repair the damaged harness using waterproof connectors to prevent moisture ingress.

  6. Reset and Final Test

    • Clear the P112F code with an OBD2 tool.

    • Perform a complete drive cycle (engine heating and cooling) to confirm the fault is resolved.

Important Tip
If the code persists after replacing the sensor:

  • Check the thermostat or water pump: A coolant circulation fault can distort the measurements.

  • Check the coolant level and quality (an improper mixture can affect thermal conductivity).

Note: A faulty RCT sensor can lead to engine overheating or premature wear of seals. Do not ignore this code!

P1133 ACURA – HO2S Insufficient Switching Sensor 1

P1133 ACURA Possible Causes

What does it mean?

  • Faulty Heated Oxygen Sensor (HO2S), Bank 1 Sensor 1
  • Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 harness is open or shorted
  • Heated Oxygen Sensor (HO2S), Bank 1, Sensor 1 circuit, poor electrical connection
  • Air leak in the exhaust near the O2 sensor

How to Fix Code P1133 ACURA?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

When is the code detected?

If the Powertrain Control Module (PCM) determines that the front HO2S has not switched enough times, the PCM will set code P1133.

Possible Symptoms

  • Check Engine Light on (or Service Engine Soon Warning Light)

P1133 ACURA Meaning

The Engine Control Module (ECM) monitors the activity of the Heated Oxygen Sensor (HO2S) for 90 seconds after the start of closed-loop operation. The ECM determines if the front HO2S is working properly by counting the number of HO2S-1 Lean/Rich (L/R) and Rich/Lean (R/L) switches.

P1133 AUDI – HO2S Heater Circuit – Sensor 1 Electrical Malfunction Banks 1 and 2

P1133 AUDI Possible Causes

What does this mean?

  • Faulty O2 sensor
  • O2 sensor wiring harness is open or short-circuited
  • Poor electrical connection in the O2 sensor circuit

How to fix P1133 AUDI code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check engine light on (or service engine soon warning light)

P1133 AUDI Meaning

A heated exhaust oxygen sensor (HO2S) indicating rich at the end of a test attempts to correct a too lean condition. The test fails when the fuel control system no longer detects switching for a calibrated duration.