Error Code P0132: O2 Sensor Circuit High Voltage Bank 1 Sensor 1

P0132 is defined as the O2 sensor circuit high voltage bank1 sensor1. It is an error code that highlights a problem in the O2 sensor circuit. It is an indication that the sensor has lagged or take too long to switch from high to low (working) voltage for too long. The p0132 code is of utter importance for vehicle owners due to the fact that a malfunctioning cylinder leads to a spike in fuel consumption. A vehicle with a cylinder in a bad condition also emits harmful gasses such as the hydrocarbons and nitrogen oxides that pollute the environment.

Common symptoms

  • Rough running engine – This the most noticeable sign as the vehicle does not run smoothly both when running and idling
  • Increased fuel consumption – While the p0132 code may not consider a severe error, it reduces a vehicle’s fuel efficiency
  • Check Engine light turns on – When this light goes on it is a clear indication of a mistake in the engine functionality that needs addressing

Possible causes

  • Very high fuel temperature
  • Exposed and broken cables
  • Occurrence of a short circuit in bank 1 sensor 1
  • PCM malfunction
  • An outdated PCM software
  • Poorly working engine fuel temperature transducer

What to Check

Below are the steps are taken to diagnose the causes of the error

  1. The first step taken to diagnose the p0132 code error is the dual trace lab scope. This is a technique where a time division graticule is set at time intervals of 100 milliseconds and a voltage of ± 2V. The signal wires are then probed on the running vehicle so see whether or not the voltage sticks at 900 mV and the time it does. There are two modes of oxygen cylinder – lean (below 300mV) and rich (above 750 mV). A cylinder in good condition should change from lean to rich within 100 Ms.
  2. Range test. This test is run concurrently with the time test. The engine is run at high speeds preferably above 1500 RPM while the throttle is closed and opened quickly. observe the lab scope readings the transducer signal should quickly move from 100mv to 900 mv within 100 ms for a properly working cylinder.
  3. Physical checks. This involves removing the cylinder and checking for the presence of a white colouration of the sensor. Presence of this white substance is evidence of slow switching, and the spark plug needs to be replaced with a healthy one
  4. Once an error has occurred it is usually stored in the PCM (power control module). An OBD-11 scanner can be used to check for the presence of error codes in the PCM.
  5. Poor wiring that is broken and exposed cables should be checked.

How to Fix the Error

  1. Replacement of broken cables and exposed ones helps repair the error as short circuits that may occur on the cylinders is prevented.
  2. Replacing the spark plug that displays a whitish appearance with a healthy one
  3. Ensuring that the fuel cooling system is in good working conditions to prevent overheating of the fuel

 

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