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P0152 – What Does It Mean and How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.

Definition

P0152 is an OBD-II Code that refers to Sensor Circuit High Voltage (Bank 2 Sensor 1)

Meaning

A P0152 code is a generic diagnostic trouble code that occurs when the PCM/ECM detects a signal voltage input indicating that the sensor is above normal range. The O2 (oxygen) sensors analyze the exhaust’s oxygen content and then the powertrain control module adjusts fuel injector pulse based on this information. They can cause the PCM to add or subtract too much gas based on the faulty O2 sensor voltage.

When this occurs, the vehicle’s computer will set off the check engine light and set a Diagnostic Trouble Code P0152.

Causes

Common causes for this code include:

  • Bank 2 Sensor 1 O2 Sensor (most common)
  • Running too rich with fuel.
  • Wiring that has frayed, broken, or been shortened
  • Damaged or corroded connector(s)
  • A stuck or leaking fuel injector
  • Pressure regulator is faulty.

Symptoms

The symptoms of a P0152 code are:

  • Illuminated Check Engine Light 
  • Reduced fuel economy
  • Increased emissions
  • Engine poor performance

Diagnosis

To diagnose a P0152 DTC code, a technician would:

  1. Scan for codes in the ECM and look at the freeze frame data for failure.
  2. Visually inspect the wiring, connectors, and O2 sensor itself.
  3. Check fuel pressure (if low it will throw off the oxygen sensor readings)
  4. Use a multimeter to check for voltage or resistance at the O2 connector (if no voltage/resistance is found then there may be an open in the wiring)
  5. Test for any exhaust leaks prior to the O2 sensor
  6. If all else fails, replace the Bank 2 Sensor 1 O2 sensor.

Common mistakes

The following are some of the most common mistakes that a technician may make when diagnosing a P0152 code:

  • Not thoroughly inspecting all the wiring and connectors.
  • Not checking for other codes that may be stored along with the P0152 code.
  • Not checking fuel pressure to make sure it is within specification.
  • Not testing for exhaust leaks before replacing the O2 sensor.

How serious is this?

A P0152 code is a mid-high code in severity since it can cause the vehicle to run too rich and produce increased emissions. It can also cause engine performance issues.

What repairs can fix the code?

The following are solutions that may fix this problem:

  • Repair or replace any faulty parts such as wiring, connectors, or hoses.
  • Clean or replace the O2 sensor.
  • Check the fuel pressure and adjust if necessary.
  • Repair any exhaust leaks before the O2 sensor.
  • Replace the Bank 2 Sensor 1 O2 sensor.

Related codes

A P0152 is related to and may be accompanied by the following codes:

P0132 – Bank 1 Sensor 1 O2 Sensor (Sensor Circuit High Voltage)

P0133 – Bank 1 Sensor 1 O2 Sensor (Slow Response to Rich-Lean Cycle Change)

P0138 – Bank 2 Sensor 2 O2 Sensor (High Voltage)

Conclusion

In conclusion, the P0152 code is a diagnostic trouble code that refers to a problem with the oxygen sensor circuit on Bank 2 Sensor 1. This can often be caused by a faulty O2 sensor, wiring issue, or fuel pressure problem. A technician should use a multimeter to check for voltage/resistance at the O2 connector and also check for any exhaust leaks before replacing the O2 sensor.